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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/smallaria_6848.png]]
[[caption-width-right:350:Killer Unicorns, Sharknadoes, Eye Demons, and [[ArsonMurderandJaywalking rocks]]! 2D exploration at its best!]]

-> ''"Terraria is a land of adventure! A land of mystery! A land that's yours to shape, to defend and to enjoy. Your options in Terraria are limitless, are you an action gamer with an itchy trigger finger? A master builder? A collector? An explorer? There's something for everyone here."''

''[[http://www.terraria.org/ Terraria]]'' (pronounced similar to "Terrarium") is a very detailed 2D WideOpenSandbox indie game, created by Andrew "Redigit" Spinks and Jeremy "Blue" Guerrette. It was made available on UsefulNotes/{{Steam}} on May 16, 2011. Version 1.1 came out on the 1st of December 2011, making the game more complex than it previously was. On October 1st, 2013 update 1.2 was released, which added over 1,000 items and other changes further increased the scope and general complexity of the game. The update introduced new biomes, enemies, and items. Version 1.3, which adds many new items and a new lunar event, was released for Windows on June 30th, 2015, with version 1.3.0.8 being the latest current version. A Mac and Linux version was opened in beta on July 23th, 2015 and released on August 12th 2015.

'Terraria'' focuses on exploring the gorgeous randomly generated world you're stranded in, to find resources to build a cozy home, equip yourself with armor and potions, befriend merchants, and defend your town from monsters. You start from scratch with little more than a pickaxe and some trees and end up crafting epic-level equipment to fight massive demons, dig cave systems throughout the land, and build a fortress that can withstand full-on Solar Eclipse events. You can share every world you create with your friends in single-player and multiplayer, and freely visit any map with any character.

Sounds a bit familiar? Absolutely! ''Terraria'' is meant as an item-based RPG variation on some of the most popular randomly generated exploration games, particularly ''VideoGame/{{Minecraft}}''. It's different in many ways, though: true to classic {{Metroidvania}}s, a strong focus is on finding upgrades to help you move around in the world better (such as accessories to let you [[SuperNotDrowningSkills breathe underwater]]) and increase your [[HitPoints life]] and {{mana}} pools. You can also end up with multiple helpful [[NonPlayerCharacter [=NPC=]]]s living in your homes that will sell things to you, heal you, and otherwise enhance your base through their services. ''Terraria'' features boss monsters that will challenge players who dare to summon them, and murder those who aren't ready. Finally, ''Terraria'' features a streamlined [[ItemCrafting crafting]] system as well as many, ''many'' decorations so that you can truly [[AnInteriorDesignerIsYou make your home your own]].

The player now has the option of entering Hardmode after clearing the first few basic quests. Hardmode is triggered by killing the boss of the Underworld, and spawns ''many'' new monsters, items, materials, bosses and [[LightIsNotGood a new, spreading biome]] into the world.

[[http://www.youtube.com/user/demilogic Redigit's YouTube page can be found here, which includes a teaser, a trailer, and a Let's Play of the alpha done by the creators themselves.]]


505 Games [[http://www.strategyinformer.com/news/19827/505-games-announces-terraria-coming-to-xbla-psn announced]] that the game would be ported to Xbox Live Arcade and PlayStation Network. New content was included in this release which until recently was not thought to be coming to the PC version. These versions were released on March 26, 2013 in the US and April 15, 2013 in Europe and Australia. In addition, 505 Games released a port for the [=iOS=] on August 29, 2013. December 10, 2015 saw 505 Games release it on the UsefulNotes/Nintendo3DS eShop with physical copies available within the first quarter of 2016.

[[http://www.rockpapershotgun.com/2013/10/03/terraria-2-announced/ According to Redigit]], a sequel, currently titled ''Terraria 2'', is in the works. A small team will continue to work on the original Terraria however.

[[http://www.terrariaotherworld.com/ Terraria Otherworld]], an Alternate Universe spinoff, has been announced to be in development. [[https://www.youtube.com/watch?v=U1HpkvoMXnw A trailer]] was shown at GDC 2015.

From April 1st to 15th, 2015, the game was free to download for Xbox Live Gold members as part of the "Games with Gold" deal.

Finally the 1.3 update has been implemented, adding some more flair to the game world as well as adding yet another in game end event, this one based around the moon itself, rather than the phase of the moon. Lower level items have been added as well with the update, as well as quite a few minor changes, such as any town [=NPC=] now defending itself, and achievements.

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!!''Terraria'' contains examples of:

* AbnormalAmmo:
** There is a host of arrow and bullet types that have odd or unique effects from setting an enemy on fire with a cursed flame to arrows that summon a star to hit the target.
** There are also weapons which fire things such as stars, coins, snowballs, candy corn, stakes and explosive Jack 'O Lanterns.
** Taken even further with a few bows, the Bee's Knees and the Hellwing Bow, that fire bees and flaming bats respectively. They still use normal arrows, however.
** The Explosive Bunny takes the cake, however, due to being fired from a specific cannon that has no other use.
* AbsurdAltitude: The game lets you visit the uppermost layer of the world, named Space. Depending on your gear and the size of your world, you could reach it in a single leap.
* AdvancingBossOfDoom: The Wall of Flesh in the Underworld.
* AfterBossRecovery: Most bosses throw out a whole bunch of hearts upon death. During Moon events, these hearts can be life savers.
* AIBreaker:
** The game has a pathfinding problem. Enemies only know how to reach you in a straight line, meaning a simple thin lava pit on either side of a house means infinite money as the enemies stroll in and immolate themselves. On the flip side, this will usually destroy loot in the underground areas where the lava is too deep. Enemies are also too stupid to walk around an obstacle when you're above them, since they only target you by the y-axis. This allows to effectively lock some enemies on a higher level of blocks.
** Doors open in either direction, but zombies normally can't open them if they're shut. This changes during the Blood Moon, but zombies only gain the ability to kick doors ''in.'' Due to the way the game handles sprites, putting anything other than a wall tile on one side of a door will prevent it from opening, meaning that if you simply hang a colored banner behind a door, it only opens outward and is thus zombie-proof.
* AirborneMook:
** Pre Hardmode: The Demon Eyes, Cursed Skulls [[note]]Formerly called Burning Skulls[[/note]], Hornets, Eaters of Souls, Meteor Heads, all kinds of Bats, Demons, flying fish, Vulture, Harpies, Antlion Swarmers, and Granite Elementals.
** Hardmode: The Wraith, Corruptor, Wandering Eye, Crimson's Floaty Gross, Hallow's Pixies, Gastropods, [[ChristmasElves Elfcopters]], {{Pirate Parrot}}s, Martian Drones, Desert Spirits, and ''several'' of the Lunar Event enemies. Besides, Wyverns make an appearance if you go high enough in the sky.
* {{Alchemy}}: As described on the FunctionalMagic page being magical chemistry. This is used to create a variety of potions out of a variety of ingredients.
* AlienInvasion: The Martian Madness event, where Martians and their machines attack in a manner similar to the Goblin/Pirate Invasion, and the Lunar event that has you fighting the invading armies of the moon.
* AllDesertsHaveCacti: Taken to the LogicalExtreme; not only does every variety of desert (normal, corrupt, crimson, and hallowed) have cacti, there is a chance for cacti to grow on ''any'' full sand block on the surface and exposed to air, unless it's in ocean range.
* AllNaturalGemPolish: Once you mine a gem, it appears in its cut and polished form in your inventory.
* AllYourPowersCombined: The entire point of [[http://terraria.gamepedia.com/Tinkerer%27s_Workshop everything in the Tinkerer's Workshop]]. It allows you combine multiple useful accessory items into a single item. This is extremely useful because players are limited to five accessory slots. Most of the examples to follow are created using it.
** The Neptune's Shell and the Werewolf Charm can be combined as part of a recipe, so the resulting Moon Shell gives the power to become a Werewolf at night and a Merfolk when submerged. The powers are mutually exclusive, however, so you lose the wolf transformation if you become submerged at night.
** The Sun and Moon stone accessories gift you with stat boosts only during the day and night, respectively, but when fused together, the resulting Celestial Charm provides the boost all the time. Combine this charm with the above-mentioned Moon Shell and get all their buffs at once in a single slot with the Celestial Shell.
** Most of the X in a Bottle accessories can be combined with Shiny Red Balloons to make the X In A Balloon items, which can then be fused together into a Bundle of Balloons that gives you three additional midair jumps.
** Hermes Boots can be combined with the Rocket Boots so you can run fast and fly. Combining the resulting Spectre Boots with the Aglet and the Anklet of Winds creates the Lightning Boots, which increases base movement speed. Then you add the Ice Skates to create the Frostspark Boots, which allow for mobility on icy terrain.
** Water Walking Boots can be fireproofed with an Obsidian Skull and a Lava Charm. The resulting Lava Waders lets you walk on lava, water, and honey, and grants temporary protection from lava damage.
** For interior decorators, the Extendo-Grip, Brick Layer, Paint Sprayer, and Portable Cement Mixer can be combined into the Architect Gizmo Pack.
** The Diving Helmet and Flippers can be combined into Diving Gear. This can be fused with the Jellyfish Necklace to get light while diving deep into dark waters, and then you can add the Ice Skates to this to also add mobility bonuses while on ice.
** The Yoyo accessories added in 1.3 (Counterweight, Yoyo Glove, and Yoyo String) can be combined into the Yoyo Bag, which will give you all their benefits in a single inventory slot (namely, additional Counterweight and secondary Yoyo projectiles that will orbit and dance around, plus improved Yoyo reach).
** Taken UpToEleven with the Ankh Shield, which is eleven different items fused into one: the Obsidian Skull, Cobalt Shield, Trifold Map, Fast Clock, Vitamins, Armor Polish, Blindfold, Nazar, Megaphone, Bezoar, and Adhesive Bandage. It grants immunity to 9 debuffs[[note]]Weak, Broken Armor, Poisoned, Bleeding, Slow, Confused, Silenced, Cursed, and Darkness[[/note]] as well as to knockback and fire blocks. You can't get more compact than ''that''.
** The Cell Phone, added in 1.3, beats it by two items, requiring 13 different items to make. It combines the twelve informational items into a single PDA which provides the combined functionality of all 12. When held in your inventory it outputs fishing information, weather, moon phase, elevation, distance east/west, time, nearest valuable treasure, player speed, current DPS, number of monsters killed, rare nearby creatures, and number of nearby enemies. ''Then'' you can combine the PDA with a Magic Mirror to create the Cell Phone which both displays info and lets you teleport to your bedside.
** Unrelated to the Tinkerer's Workshop is the Night's Edge, which is crafted by combining the Blade of Grass, Fiery Greatsword, Muramasa, and the Light's Bane at a Demon/Crimson Altar. This is followed by the Terra Blade in Hardmode. You have to combine the Night's Edge with the Broken Hero Sword to create the True Night's Edge, forge Excalibur from Hallowed bars and combine it with another Broken Hero Sword to create the True Excalibur, and ''then'' combine the two to make the Terra Blade. It's well worth it, though, as the Terra Blade is one of the the best swords in the game.
* AlwaysNight: The aboveground mushroom biome; it automatically turns to night whenever you enter. Daytime's still preserved outside of the biome.
* AmazingTechnicolorPopulation: The players have the option to select some unusual skin colours for their characters.
* AnchorsAway: Fishing in a Hardmode world occasionally nets you an Anchor (either directly or from wooden crates) that can be used as a flail-like weapon.
* AndYourRewardIsClothes:
** Several rare mobs and mini-bosses can drop clothing items.
** Defeating Skeletron unlocks an [=NPC=] that sells clothing.
** During the Halloween update, enemies have chances to drop Goodie Bags, which can have one of several different sets of...you guessed it, costumes. [=NPCs=] will also sell extra vanity items during this time as well, many of them being their own outfits.
** While playing in Expert Mode, bosses drop bags that contain their boss drops as well as an Expert unique boss item. Bags from the hardmode bosses will sometimes have very rare costumes in them.
** "Strange Plants" can be traded for dyes. The dyes themselves are usually very flashy and rare, but it's the only purpose the plants have.
* AnimalMecha: One of the hardmode bosses, the Destroyer, is a giant mechanical worm.
* AnimatedArmor: One of the enemies is the Possessed Armor. The Paladin may also be this.
* AnimeHair: Some of the hairstyles the player can choose from a character.
* AntiAir: The Crawltipedes fought around the Solar Pillar. They'll ignore you if you're standing on a surface, but as soon as you take to the air they'll home in on you very quickly, causing crazy amounts of CollisionDamage.
* AntiFrustrationFeatures:
** A good number of recipes that call for Corruption-based components will work perfectly fine with their Crimson counterparts For example, Night's Edge can be forged using the Blood Butcherer in place of the Light's Bane, and the Battle Potion can use Vertebrae ''or'' Rotten Chunks as ingredients and still work.
** Every metal has a counterpart that works just as well. Recipes that call for a specific ore will work with the counterpart ore. For example, the Slime Crown used to summon the Slime King can be made with either a Platinum Crown or a Gold Crown, depending on which one your world generated. There are some slight differences (e.g. a Tungsten pickaxe can mine Meteorite while its counterpart, a Silver Pickaxe, cannot), but for the most part, it's all the same.
** The Extractinator and the Crates acquired via fishing can provide you with the alternate metals that were not generated in your current world, reducing the need to worldhop for crafting ingredients. Now with a little patience, you can fish for Titanium in hardmode if your world generated with Adamantite instead.
** The Hardmode Boss, ''The Destroyer'', used to be a little troublesome to retrieve deathdrops as they used to spawn where the head would be, even if it was deep underground. Version 1.2.3 on the PC fixed this by making the deathdrops spawn at the player's location instead, saving you the trouble of having the scour the ground to recover the Souls of Might and Hallowed Bars.
** The 1.3 Update adds a UI hot button to the Inventory subscreen so you can now Quick Stack items from your inventory into ''all'' adjacent storage chests with a single click. No more need to manually open each chest just to hit the Quick Stack for each one now.
** In previous versions of ''Terraria'', some players had serious concerns that the spreading Corruption or Crimson could overwhelm and completely engulf the Jungle Biome. This became a bigger concern in 1.2, as the Jungle was expanded to add new bosses and unique Hardmode loot. As of the 1.3 Update, Chlorophyte can now influence the spread of Mud blocks and prevent/limit the spread of Crimson and Corruption, allowing the Jungle to better protect itself from being overwhelmed by the Corruption or Crimson.
** A number of players have commented on the rarity of Solar Eclipses in 1.2. 1.3 solved this by adding a Summon Item in the vein of the Frost and Pumpkin Medallions that causes the Solar Eclipse on demand, although you ''will'' need to harvest the components for it from the Jungle/Lihzahrd Temple. Likewise, 1.3.0.5 adds a Summon Item to trigger a fight with [[spoiler:The Moon Lord]] without having to go through an entire Invasion Event to make them spawn.
** In all previous versions of ''Terraria'', worlds generated with what players dubbed "land mine traps," Explosives Blocks cunningly buried inside the ground with a barely-visible pressure plate wired to them, causing many a Hardcore player some real grief. Version 1.3 overhauled this by placing the Explosives Block above ground wired to a giant plunger to activate it and atop a massive pile of ore. Now only true carelessness will get you exploded without warning.
** In Expert Mode, any player who fights a boss will get his/her own bag that is filled with boss drops. Outside of Expert Mode, it's a mad grab to try and get boss items, leaving co-operating players always left short of an item, and leaving people who are with more antagonistic or greedy players to hope that they don't get the short end of the stick by someone managing to steal all the boss drops. On Expert, each bag is filled with the full range of boss drops, so every player that fought it will get at least one unique boss item when opening a bag.
** Players can 'uncraft' a few items such as platforms and walls, so they don't have to worry about leftovers while constructing settlements.
** Prior to 1.3, the Avenger Emblem could only be crafted with a Sorcerer Emblem, Warrior Emblem, and Ranger Emblem together. Since those items all drop from the same boss, the boss' summoning item is uncommon, and there is a grace period between successive summons, it could take hours before one could craft the Avenger Emblem, which is itself an ingredient in many endgame accessories. In the current version, the Avenger Emblem can be crafted from any single Emblem plus Souls from all three Mechanical Bosses.
* AntlionMonster: Antlions make up several pre-hardmode desert enemies—not only the larvae that burrow in the sand, but also the winged adult.
* AprilFools: [[http://www.terrariaonline.com/threads/duke-fishron-and-the-aquarian-horde.137907/ In the form of a joke post about a new boss and new invasion that came alongside it.]] This becomes {{Foreshadowing}} when it turns out ''The boss, Duke Fishron, is a real thing (sans the invasion)''. Further foreshadowing with the same boss, the April Fools post claims that Duke Fishron demands a fair fight, and will scale its HP based on how many players are in the server. In 1.3's Expert Mode, this is actually the case, where Duke Fishron's HP will increase the more players there are.
* ArmCannon: You can get one from the Martian Madness event: [[http://terraria.gamepedia.com/Charged_Blaster_Cannon the Charged Blaster Cannon]].
* ArmsDealer: The [[ExactlyWhatItSaysOnTheTin Arms Dealer]] [=NPC=], which sells you guns and ammo once you have found a gun.
* ArrowsOnFire:
** The game allows you both to craft flaming arrows by combining a torch with a few normal arrows, as well as craft a Molten Bow that makes normal arrows fired by it flaming arrows instead. Either way the weapon deals a bit of extra damage and has a fairly high chance to set enemies on fire, something that's quite practical as it makes monsters light up in the dark and be very visible targets no matter ambient lighting.
** Also includes frostburn arrows and cursed arrows, which are covered in ColdFlames and {{Hellfire}}, respectively. The console and mobile editions have spectral arrows, which inflict spectral flames.
* ArtificialAtmosphericActions: Your [=NPCs=] will interact with each other through pictorial speech bubbles, such as playing RockPaperScissors.
* ArtificialGill:
** A breathing reed enables the player to stand in deeper water and still access air and also doubles the time they can stay underwater without breathing.
** Flippers allow the player to swim, meaning it is easier to move around in water and avoid drowning.
** Diving helmets improve how long the player's air meter lasts.
** The diving gear -- a combination of the flippers and diving helmet -- grants both benefits.
** There's a potion that allows you to breathe underwater for 2 minutes, the Gills potion, which [[ExactlyWhatItSaysOnTheTin makes you grow gills]].
** There's a magical shell that turns you into a merman when you enter water, making drowning impossible and granting normal movement underwater. It is combined to form another charm but retains the original effect.
** [[AllYourPowersCombined Combining]] Diving Gear with a Jellyfish Necklace makes a set of diving gear that not only lets you move better and breathe longer underwater, but gives off a subtle glow to help you see a bit better underwater as well. Adding Ice Skates to ''that'' creates the Arctic Diving Gear, which has the properties of both the Jellyfish Diving Gear and the Ice Skates' extra mobility on ice.
* ArtStyleDissonance: The game takes much the same philosophy and gives it the backdrop of a cutesy cartoon style. Want to build that nice, big 8-story house filled with expensive furniture and decorations and gold bricks? Well then be prepared to face those [[NightOfTheLivingMooks zombies and skeletons]] and DemonicSpiders that made ''VideoGame/{{Minecraft}}'' a living hell, only this time with {{Eldritch Abomination}}s thrown into the mix.
* AsteroidsMonster:
** Mother Slimes, a giant slime which breaks into three Baby Slimes when killed.
** The King Slime boss, which splits into smaller Slimes as you attack it.
** The Eater of Worlds, a boss monster that will split in two every time one of its segments is destroyed, unless one would be shorter than two segments. It has fifty segments, and each new Eater of Worlds obeys the same rules. It is entirely possible to have several Eaters of Worlds at once.
** The Corrupt Slime, which acts much like a stronger Mother Slime and splits into several Slimelings upon defeat. Also, on the console version, a slightly stronger Shadow Slime that does the same thing.
** The Star Cells that accompany the Stardust Pillar will split into a few smaller cells when killed. If these smaller Star Cells aren't killed fast enough, they'll grow back to full size, allowing them to split again. They can easily swarm a player with poor crowd control abilities. It should be noted that each regrown Star Cell ''does'' count as a kill toward breaking the pillar's barrier, while small ones ''do not''.
** Similar to Star Cells, there's also the Alien Queens that accompany the Vortex Pillar. When beaten, they split apart into three Alien Larvae, which if not killed in time, grow into Alien Hornets, which if still not killed, develop into more Alien Queens. All of them except the larvae also count towards breaking the barrier.
* AttackTheTail: The [[CreepyCentipedes Crawltipedes]] can only be damaged in the glowing spot in their tail.
* AutomaticCrossbow: The Repeater weapons that can be earned from Hardmode ores have Autofiring, meaning the player can just hold down the mouse button to fire them.
* AwesomeButImpractical:
** The Bundle of Balloons gives you a ''quadruple jump'', but requires three Shiny Red Balloons and the three primary double jump bottles (normal, Blizzard, and Sandstorm) to make. Balloons only appear in chests on Floating Islands and even then likely only once or twice. You either have to create additional worlds to farm for more or fish up Sky Crates from Floating Lakes. The Sandstorm Bottle is even worse, as it can only be found in a chest in a Pyramid, a structure which isn't even guaranteed to spawn in a world, and even if it does you may not get the bottle. Getting it means creating world after world in the hopes that one will eventually spawn the bottle.
** The Star Cannon is one of the highest-damaging weapons in the game before you hit hardmode. It fires Fallen Stars, which only drop at night in limited quantities scattered across the Surface of your world, and are not reusable once fired.
** The Shadow Orb or Demon Heart. A magic item that creates a dim light source that slowly follows the player around. Other lighting items and abilities are both more practical and give better light. At best it is good as a back up—even if it's your only independent light source, you'll still find yourself pulling out those torches so you can see more clearly what you caught in the corner of your eye.
** In the words of the Demolitionist: "Why purify the world when you can just blow it up?" Dynamite and Bombs are the best ways to clear the Corruption, but you need so many of them that you'll quickly run out of money. While bombs can be farmed for free along with the other components to make the upgraded sticky bombs, the more powerful and effective dynamite remains a very expensive alternative at 1 gold and 50 silver apiece.
** The Starfury might drop stars on whatever you point it at, but it doesn't work well underground due to potentially frequent cavities above the one you are in. It no longer uses mana, but relying on the falling stars to deal the bulk of your damage becomes less dependable without pure open space or fully solid material above you to the top of your screen.
** The Sniper Rifle has the highest ranged single-shot damage in the game and the ability to scroll the screen, but it has a very low rate of fire. The weaker, faster-firing weapons can usually dish out almost as much punishment, with less penalty for missing. The Sniper Scope can give any gun the ability to scroll, making it even less appealing. And finally, to put the cherry on top, a new item introduced in 1.3 is infinite basic ammo, meaning you can't even use it to try and preserve your ammo.
** The Drill Containment Unit. Crafting it requires 40 bars each of Hellstone, Meteorite, Chlorophyte, Shroomite, Spectre, and Luminite, the latter only dropped by the FinalBoss and even then you have to beat him at least twice just to get enough. Once you've crafted it, you have a flying mount that mines faster and more efficiently than pretty much everything else in the game, but has terrible precision and prevents you from using weapons while you're riding it. And, of course, by this point you've beaten the entire game.
** The Suspicious Looking Tentacle, dropped from [[spoiler:the Moon Lord]] in Expert Mode. It's a light pet whose main function is to inform you of when an enemy or treasure is nearby, but you should already have a Cell Phone that does exactly that, while letting you keep the [[WillOTheWisp Wisp]] in a Bottle, which is a better light pet.
** Many of the Expert Mode-exclusive boss items can be considered this. While rendering slimes neutral, increasing regeneration while standing still, or making bee-related weapons more powerful sound good in theory, in practice you are unlikely to want to leave one of your more mundane accessories behind to make room for an Expert one.
** The Coin Gun is probably the ultimate example. Firing platinum coins gives it a base damage rate of over 1700 HP per second, more than almost any other weapon; but this is rather unsustainable, given how long it takes to earn a single platinum coin (you can buy every single NPC store item with less than 20) and the fact that it fires 8.5 of them ''per second''. Firing silver coins instead makes it much more efficient (10,000 silver coins = 1 platinum coin) and comparable in power to the Star Cannon, but this requires a lot of fiddly coin crafting.
* AnAxeToGrind: The axes are considered tools, but can be used to defend yourself in a pinch. Higher-level axes are actually viable weapons that just happen to retain their uses as tools.
* BadMoonRising:
** The Blood Moon event, which happens occasionally. It increases the enemy spawn rate, overrides spawn restrictions in towns, gives zombies the ability to break doors, and spawns [[DemonicSpiders Clowns]] in Hardmode.
** 1.2 brings forth the Solar Eclipse in hardmode, which is even ''worse''.
** And now we have the Pumpkin Moon! Ghouls, ghosts, and fire-spitting trees of death!
** Another moon event, The Frost Moon, which makes all your Christmas joys become nightmares, is now available as well.
* BadWithTheBone: The game has bones as an early-game thrown weapon. Given [[DemBones what sorts of enemies drop the bones,]] you can ultimately end up killing skeletons with parts of other skeletons.
* BagOfHolding: Storage items (player inventory, chests, etc.) tend to get ridiculous when you can store spears and swords several times the size of your body in them. The storage items never get any bigger than your character though.
* BallisticBone:
** There are dungeon skeletons that drop bones which you can throw at enemies. They do a surprising amount of damage, far more than even shuriken.
** The Skeleton Merchant throws bones at non-skeleton enemies.
** In Expert Mode, defeating [[DemBones Skeletron]] will net you the Bone Glove, which makes thrown bones do even more damage and gives you a chance of not consuming a bone when thrown.
* BanditMook: In 1.3's Expert Mode, almost all enemies can pick up money from the ground, and if they escape, the money is lost. Yes, this even includes the money dropped when you die.
* BareYourMidriff: The game has some of this since the 1.1 update, introducing new female shapes along with the rest of the major content, the most particular example being the Hallowed armor. The earliest armor that easily highlights this is the Shadow Armor, and the Jungle Armor outright gives females a bikini top.
* BatOutOfHell: The game has many varieties of bats that all attack the player. Including ''literal'' bats out of hell in the game's Underworld.
* BattleBoomerang:
** Boomerangs come in several types, such as the basic Wood Boomerang, the Enchanted Boomerang, the Flammerang, and the Frost Boomerang. Other types of [[PrecisionGuidedBoomerang boomerang-type weapons]] include chakrams, throwing hammers, ''bananas''...
** Boomerangs benefit from melee bonuses. This means that they can be combined with a melee knockback accessory to keep waves of monsters at bay. This also gives melee oriented players some ranged capability that benefits from melee bonuses.
* BeamSpam:
** Several of the player's weapons enable the player to lay down their own BeamSpam on enemies, such as the Space Gun, Laser Rifle and Heat Ray. The Laser Machinegun, however, surpasses all of them with its extremely high rate of fire.
** The Necromancer and Ragged Caster from the Hardmode Dungeon both spams beams quite a bit, the former's bouncing off walls and the latter's going homing in on the player.
** The Solar Eclipse exclusive enemy Eyezor shoots lasers from its eye.
** The Ice Golem fires lasers from its head.
** Ice Mermen fire ice beams constantly at the player.
** The Wall of Flesh begins firing more and more laser barrages as you chip away at its health.
** Hardmode bosses The Destroyer and Retinazer also engage in this.
** The Gastropods in the Hallow tend to spawn in small groups and will fire on the player repeatedly.
** The Golem found in the Lihzahrd Temple fires lasers from its eyes, and fires faster as its health gets lower.
** The Martian Saucer definitely qualifies. In its first phase, it fires ''dozens'' of lasers as part of its attack pattern; in the second phase, it repeatedly swipes a large beam across you and ten tiles around you.
* BeatingADeadPlayer: All monsters hover around the point where you died until you respawn. Other enemies, like casters and ranged enemies, sometimes keep casting or attacking towards where the player died last. This also has the effect, on Expert mode, of having the enemy who killed you steal the money you dropped, forcing you to track the monster down and defeat it before it despawns.
* BeeAfraid:
** Hornets really, but there's dozens of the bloody things in the underground jungle.
** 1.2 took this to a whole new level, adding miniature bees, a beehive sub-biome, and a Queen Bee boss.
** Subverted for the player with certain items, including items that summon bees when the player is damaged, a bee grenade that releases a small swarm, a bee gun that shoots bees, and a hornet gun which is the upgrade to the bee gun.
** If you're DEAD SET on bees, you can grab a Hive Pack by fighting the Queen Bee in Expert Mode to boost your bees.
* BeeBeeGun: A new addition within the 1.2 update, the Bee Gun, obtained by killing the [[InsectQueen Queen Bee]], [[ExactlyWhatItSaysOnTheTin shoots homing bees at your enemies.]] The Queen Bee can also shoot smaller bees out of her bottom. A more powerful variant exists that shoots hornets instead. There are also Beenades and accessories that summon bees to attack your enemies when you get injured. There's also the Bee's Knees, a bow that turns arrows into bees when fired.
* BeefGate:
** You can enter the Dungeon at the edge of the map anytime you like. You can only ''safely'' enter the dungeon after you've taken out Skeletron. If you enter before killing Skeletron, you will have a Dungeon Guardian that that attacks you for ''[[ChunkySalsaRule 1000 hit points]] [[ThereIsNoKillLikeOverkill of damage]]''. Players have learned how to kill the Dungeon Guardian regardless of the changes, though (barring glitches) most of those tactics require endgame gear.
** The Wall of Flesh is the gate keeper to Hardmode, as such you are either completely over prepared for the battle with it or you are going to die. This insures you will at least be able to survive the vastly more deadly creatures in a Hardmode world.
* BerserkBoardBarricade: You might find yourself doing this when the Blood Moon rises and zombies gain the ability to open doors. In Hardmode you also have to worry about a number of new hostile enemies including werewolves trying to batter down your doors.
* {{BFS}}: Most swords above the regular ore tiers are at least as big as your character. The largest sword in the game, the Breaker Blade, is more than twice your own height.
* BigCreepyCrawlies: Many examples, from [[AntlionMonster antlions]] (including the rarely seen flying form) to [[SandWorm underground worms]] to [[BeeAfraid giant bees and hornets]], and of course [[GiantSpider terrifyingly large spiders]]. [[RandomDrops If you're lucky]], you can even get the honeyed goggles from the queen bee boss, allowing the player to summon and ride a slightly smaller giant bee.
* BiggerIsBetter: The best melee weapon modifier, Legendary, comes with a size bonus. Another weapon modifier, Massive, is slightly bigger than Legendary, but without the speed and damage boost. The larger blades give an advantage in area they cover with each attack which is useful for certain enemies.
* BioluminescenceIsCool: You can find Blinkroot hidden underground, which [[ExactlyWhatItSaysOnTheTin does exactly what you'd think it does:]] Blinks. (Though only when it's blooming.) Every type of potion-making herb will glow when blooming, though Blinkroots are probably among the easiest to find as they grow all over the place underground. Also noteworthy are tall Glowing Mushrooms (also found underground) that are better for healing and potion-making than surface 'shrooms.
* BladeOnAStick: There are several polearm-like weapons like spears, tridents, and glaives that all work the same.
* BlingBlingBang: You can buy the components for Golden bullets, which are pretty powerful and make enemies drop more money when hit with them, so they pay for themselves.
* BloodlessCarnage: A new option introduced in 1.3 allows you to turn off blood and gibs, instead making enemies and characters disappear into clouds of smoke upon death similar to ''{{VideoGame/Minecraft}}''.
* BloodyBowelsOfHell: The Crimson. You can also make your own hellish bowels by converting crimson blocks into flesh blocks and furniture using a Meat Grinder dropped from Hardmode Crimson enemies.
* BloodyMurder: Despite the name suggesting UrineTrouble, the Golden Shower weapon actually fires a yellow stream of "ichor", which is basically highly corrosive demon blood.
* BlowGun:
** You can find blowpipes in some chests near the surface. While getting ammunition for it is a cinch (it uses seeds that you collect by cutting grass), the weapon is far outclassed by most other ranged weapons, at least one of which you should have at that point.
** Later versions added stronger weapons like the blowgun, dart rifle, and dart pistol, as well as special darts that can be fired from all blowgun-type weapons. They're still pretty well outclassed by more traditional ranged weaponry.
* BlownAcrossTheRoom: Any weapon with extremely high knockback can send enemies flying.
* BonusBoss:
** The Dungeon Guardians were never intended to be killable, but [[LordBritishPostulate players have still found ways to do it]]. This has been acknowledged with a unique (though purely cosmetic) item that only they drop.
** Duke Fishron, a weird shark-pig boss added as something of an April Fool's joke. Fighting him (by fishing in the ocean with a rare mushroom worm) doesn't trigger any other events, and he doesn't drop any special crafting materials. Good thing, too, because he likes to repeatedly launch himself at you faster than you can dodge.
* BonusLevelOfHell: Once you kill off Plantera, a whole new set of enemies starts spawning in the Dungeon. If you enter, you can expect hordes of heavily armored skeletons, teleporting mages, giant cursed skulls, spirits that spawn out of dead bodies, and Paladins that have boss-level health and can outdamage ''Skeletron Prime''.
* BoozeBasedBuff: Sake and ale give a bonus to damage at a slight cost to defense.
* BoringButPractical:
** The Mining Helmet, while not as bright as a torch and somewhat expensive in the first dozen hours of play, will make your life in Terraria ''so'' much easier when you get it. However the tradeoff is that you have to wear it in your head armor slot rather than social slot, which breaks armor set bonuses and can drastically lower your potential Defense score.
** Picks also qualify. Did you just find a new, awesome ore to craft with? You really ought to craft a pick with it so you can dig faster.
** The Cross Necklace doubles your MercyInvincibility. That's all it does, but it's extremely useful against enemies that can hit you in very quick succession like the Destroyer, the Hardmode worm boss. This is especially important if it allows you to steal more health using certain equipment than lose it due to constant damage from enemies. It can be combined with the Star Cloak as mentioned above.
** Cursed Torches. They're plenty bright, don't go out in water, and one Cursed Flame makes thirty-three torches. On Crimson worlds, there's Ichor torches, which are made just like cursed torches, only slightly brighter.
** Campfires. They only cost wood and torches, take about as much space as a crafting table, and passively accelerate your regeneration. Their effect also stacks with the more powerful Heart Lamp. Handy for various situations.
** The Magic Dagger: Available early on in Hardmode as a common drop from Mimic monsters, you can whip out throwing daggers at a very rapid rate with average knockback. Plus, it only costs 6 mana per dagger before any bonuses, making it a decent backup ranged weapon for non-mage characters.
** Ropes. Introduced in 1.2, they aren't much to look at as tools, but are very helpful. You can combine 10 lengths of Rope into a Coil of Rope that can be thrown to tether it from a distant ledge, use them to help elevate your homebase/town off the ground so monsters cannot invade easily, and even use it to "Indian Rope" upwards into the sky in search of Floating Islands. Chains, which function the same or as a crafting component, are the iron/lead-based counterpart to ropes, only you're also able to forge them from ingots.
** Iron and Lead. The second tier of the basic metals (next strongest after Copper and Tin), they will actually remain relevant to engineers and mechanism builders well into the lategame, despite being less powerful/exotic than, say, Cobalt or Mythril, as you will ''need'' these mundane metals to continue crafting things like Pumps (which you will want in order to make moving liquid around without resorting to a giant stack of buckets possible/less cumbersome), Chains (which are used to make Heart Lanterns and Watches, the latter of which is an important part of making Timers), and Buckets. They're even more indispensible if you plan to make and use minecart tracks, which require iron to forge.
** When there is a Blood Moon, zombies can open your house's doors. You can stop them in two ways: put something behind the door or dig in front of the door so that the zombies cannot reach it.
** Out of all the Expert Mode boss drops, there's the Worm Scarf. It reduces 17% of damage taken. Compared to most of the other pre-hardmode Expert Mode boss items, it sounds rather mundane but it isn't situational (Royal Gel, Hive Pack, Bone Glove, Brain of Confusion). Furthermore, this damage reduction is extremely useful for the increased damage that Expert Mode enemies do.
** The Bug Net. It is used to catch critters, all of which are useful: things like bunnies and birds get you cash (5 rabbits sell for the cost of the Net) and worms, butterflies and fireflies are bait, required to get fish and, indirectly, some very good objects. If you get a Gold critter, you can sell it for 10 gold coins or use it as bait, with the highest fishing value in game.
** Wooden platforms. A simple, semi-solid platform you can jump or fall through with ease. They only require wood to make and don't even need a crafting station. Pretty much every boss strategy begins with the phrase "Build an arena out of wood platforms." There's simply no more cheaper or effective way to put the terrain on your side than several long rows of wood platforms.
* BossBattle: There are upwards of twelve different bosses as of the 1.2 Update.
* BossBonanza: Upon killing the group of cultists outside the dungeon, [[spoiler:the boss battle against the Lunatic Cultist is triggered. Killing him immediately triggers the Lunar Events, four fights against giant floating pillars that constantly summon enemies. After destroying all four of them, the FinalBoss of the game, the Moon Lord, appears after a minute.]]
* BossInMookClothing:
** ''Wyverns''. Thousands of HP, constantly home on you, high attack power, and won't stop pursuing you ''even if you teleport away''. The console version introduces the Arch Wyverns, which are even more powerful.
** 1.2 patch introduces various randomly spawning tough enemies in the Dungeon. Especially deadly is the Paladin, who has more HP than all pre-hardmode bosses bar the Wall of Flesh and the Eater of Worlds, sports a titanic 50 defense (more than 4x that of the Wall's 12), and deals triple digits of damage in melee and a ranged hammer attack that passes through walls.
** The Goblin Summoner of a hardmode Goblin Invasion has 2000 HP (where all the other goblins have only around 100), moves around a lot, and can shoot powerful shadowflame projectiles. Despite all this, she's only considered a regular enemy, dropping banners instead of trophies.
** Pirate Captains. They look similar to other Pirates, and in the heat of battle, it's easy to not notice a Captain at first. They have 2000 HP and are armed with a machine gun and a cannon.
** The Rune Wizard, an ultra-rare Hardmode enemy found underground. It can not only teleport, but it's also powerful enough to kill most players in a few hits, and has absurdly high contact damage.
** The Ice Golem, a semi-rare monster that only shows up in Hardmode blizzards.
** Eyezor of the Solar Eclipse, a zombie with a single giant eye and loads of health, gets faster as it takes damage, and shoots lasers with increasing frequency as it takes damage, Retinazer style.
** Nailhead of the Solar Eclipse, a [[Franchise/{{Hellraiser}} Pinhead]] expy that sports 4000 HP and sprays nails in all directions when damaged.
** Mothron of the Solar Eclipse, a [[Franchise/{{Godzilla}} Mothra]] expy that has 6000 health, flies around to charge into you, and lays eggs that spawn smaller copies of itself.
** The Headless Horseman during the Pumpkin Moon has the highest HP of any non-boss enemy in the game (10,000!).
** The Yeti of the Frost Moon has quite a bit of hit points (3500) but hits for 160 base damage, 30 more than the Headless Horseman.
** The Hallow, Corrupt, and Crimson Mimics are the bigger, stronger brothers of the regular Mimic: They have 3500 HP, are much more aggressive, and can even go through walls, but can drop unique weapons and accessories. You can also spawn them yourself by placing a special key in an empty chest, but you better be prepared before you do so.
* BossWarningSiren: Comes in one of two flavours. When bosses occur naturally they are accompanied by an onscreen message, such as "You feel an evil presence watching you." for the Eye of Cthulhu, or "You feel a quaking deep underground." for the Destroyer, each boss having a unique message so the player can tell which one is coming. When summoned a message saying "(Boss Name Here) Has Awoken!" accompanied by a common boss monster roar. [[spoiler: In addition to an onscreen message, the screen blurs and darkens when the Moon Lord is about to appear.]]
* BottomlessMagazines:
** The Endless Quiver and Endless Musket Pouch allow you to use infinite Wooden Arrows and Musket Balls for ammo respectively.
** Armor crafted from Meteorite bars will give you unlimited use of the Space Gun.
** The Toxikarp, a fish/weapon fished up in hardmode corruption, is considered a ranged weapon but requires no ammo at all.
* BowAndSwordInAccord: This option is quite feasible, as is TheMusketeer. This tends to work best with the harpoon or other ammoless weapons that count as dealing [[DamageTyping ranged damage]]. Melee specialists can do the same by using boomerangs and similar weapons, as those are distance weapons that count as dealing melee damage.
* BraggingRightsReward:
** As of update 1.2, killing the Dungeon Guardian (you know, that thing that is almost unkillable and instakills you when you touch it) nets you a Baby Skeletron, which is a pet that follows you around and does nothing, but makes you look cool.
** To a lesser extent, a large portion of the available pets count, given how nearly all them require either immense amounts of grinding or seriously unintuitive actions. The Baby Dinosaur, for instance, has a 1 in 5,000 chance of being produced by an Extractinator for every Silt/Slush block you place in it, or a 1 in 1666 chance if using desert fossils.
** Update 1.2 introduces Boss Trophies, which don't do anything for you as equipment, but make great furniture for decorating. Spares can be sold for one gold coin, which is fairly decent.
** Players often display the various armors that can be created as bragging rights.
** The addition of both artwork and hanging banner collectible items can also earn bragging rights for players diligent enough to collect them all.
** Banners are dropped by enemies every 50 kills, and there are banners for almost every enemy, including obscenely rare ones such as the Nymph.
** The Axe, an axe/hammer with the highest Axe and Hammer power in the game. There is a 2% (0.5% in some versions) chance of Plantera (a boss who's hard to farm due to its random location nature) dropping it. It is only moderately faster than other tools of its type and has +1 to range, neither of which matters when hammers and axes simply don't see as much use as the pickaxe.
** As of 1.3, Achievements have been added. One of them, called "Mecha Mayhem" requires fighting The Destroyer, The Twins and Skeletron Prime simultaneously and emerging victorious.
* BigBoosHaunt: The dungeon. All but one of the enemies there are supernatural in origin or hinted to be supernatural.
* BlindIdiotTranslation: The game has multiple languages as of version 1.2 . However, at least in the German language, the word "close" as in "close a window" has been translated as "close by". Furthermore, the word "save" as in "save the game" has been translated to mean "save" as in "save money".
* BrutalBonusLevel: The game has several examples, but the best is the Hardmode Dungeon. Unlike the rest of the world, the Dungeon doesn't enter Hardmode after the Wall of Flesh bites it; rather, you have to kill off Plantera before it happens. Once it does, though, ''watch out''. If you enter, you can expect hordes of skeleton soldiers, skeleton mages, skeleton ninjas, SWAT skeletons, and Paladins with four digit HP and attacks that can outdamage Skeletron Prime. Outside of player-triggered events, it is the most dangerous area in the entire game.
* BubbleGun: Actually a magic weapon in this game. It's also extremely powerful and fires very rapidly, but has short range. Duke Fishron uses homing bubbles as an attack. 1.3 adds the Toxikarp, a ranged weapon that fires poison bubbles that float upwards and [[BottomlessMagazines doesn't require any ammo]].
* BucketHelmet: You can craft a bucket out of iron or lead, which can be equipped as a helmet, and is worth a grand total of one defense point.
* BullfightBoss: Partially. The Eye bosses use this as a method of attacking frequently in addition to other abilities.
* {{Cap}}: The game has caps for how many items you can hold in a slot, and it depends on the item. Blocks and Ammunition have the highest cap of 999.
* CapeWings: Due to their sprites occupying the same slot, if a player equips a cape and wings at the same time, the cape will show on the ground, but be overridden with wings when the player goes into the air.
* CarryingTheAntidote: A lot of monsters inflict various nasty status conditions. However, they have a small chance of dropping an item that gives you immunity to their respective debuffs. Even better, you can combine several of them into one item for maximum immunity.
* CastFromHitPoints: The Rod of Discord allows you to TeleportSpam at will, but using it too often causes it to take a significant chunk of health.
* CastFromMoney: The Coin Gun will shoot coins at enemies, dealing damage depending on the value of the coin.
* ChainsawGood: When you have access to Cobalt/Palladium, Mythril/Orichalcum, Adamantite/Titanium, or Chlorophyte, you can make chainsaws. Like most axes in the game, they make good impromptu weapons. As of the Fishing Update, you can also fish up a Chainsaw ''Shark'' and use it as such. The Butcher of the Solar Eclipse wields a chainsaw, and occasionally drops the Butcher's Chainsaw, which is not only the strongest chainsaw, but also releases damaging sparks when it hits an enemy.
* ChargedAttack: Both the Charged Laser Blaster and Medusa Head can be charged up to perform much stronger attacks, at the cost of using more Mana.
* CherryTapping: The game introduced Snowballs as a 'throwing weapon', though they generally do piddly damage and even the Snowball Cannon is hardly any danger. The thing is, given the way the game calculates damage, any hit still does at least one point of damage to a target, and the most important hit point is [[CriticalExistenceFailure the last]]. It's possible to pelt a target with 'harmless' 1-damage snowballs until they [[LudicrousGibs explode in a gory spray]].
* ChestMonster: Mimics show up in Hardmode, dropping fairly useful accessories but being reasonably tough to somebody who just started Hardmode. The 1.3 Update adds Hallow/Corruption/Crimson Mimic minibosses which are stronger and have unique loot drops. Unlike normal Mimics, these can be summoned with craftable keys and an empty chest. Pre-Hardmode, it's possible to summon normal Mimics through the use of a chest statue, but these won't drop any loot.
* TheChewToy: The Guide. He must be killed each time you want to summon the Wall of Flesh. The developers even showed a pic using him as a guinea pig for testing the new conveyor belt in 1.3.1... [[http://forums.terraria.org/index.php?profile-posts/175781/ by using the conveyor belt to throw him to the lava]].
* ChristmasElves: The game has an army of elves in the Frost Moon event. Some know archery and others ride helicopters shooting a [[GatlingGood Gatling gun]] at you.
* ClothesMakeTheSuperman: The only thing "intrinsic" to characters is how many hit points and mana points they have, so you can start a new character and immediately make him Death, Destroyer of Worlds by giving him your old character's gear.
* CobwebJungle: {{Giant Spider}}s lurk in minibiomes riddled with continuously regenerating cobwebs.
* CognizantLimbs:
** Skeletron and Skeletron Prime's limbs. They attack the player on their own when in range separate from the main head and can be destroyed by the player.
** The Golem's fists. They launch out at the player on their own while the rest of the boss shoots fire balls, lasers, and jumps at the player.
** [[spoiler: The Moon Lord's]] eyes and hands also have separate HP bars and will attack viciously if another part is destroyed.
* ColdFlames: The Frostburn effect, which the player can utilize with several icy items: the Flower of Frost, frostburn arrows, the Amarok (an icy [[KillerYoYo yoyo]]), and the set bonus of the Frost Armor.
* CollisionDamage: The bulk of enemies will run into the player to do damage to them.
* ColorCodedItemTiers: [[http://terraria.gamepedia.com/Rarity Rarity]], a statistic applying to all items, that loosely indicates their value and the difficulty with which they are obtained. An item's Rarity is indicated in-game by the color of its name text, as displayed, for example, when rolling the cursor over the item in an inventory slot. An item's Rarity can be raised or lowered by up to two tiers depending on its Modifier. There are 13 tiers of Rarity which go from gray (the lowest) to purple (the highest), plus two special tiers not normally available (rainbow, exclusive to expert-mode items, and amber, exclusive to quest items).
* ColorCodedMultiplayer: In multiplayer, the Dye Trader sells special team dye that changes the color your equipment to your team's color if you're on one. The Stylist sells team hair dye that makes your hair change color in much the same way.
* ColorCodedStones: The game includes purple amethysts, yellow topaz, blue sapphires, green emeralds, red rubies and white diamonds, the value, rarity and the quality of items crafted with those gems are in that same order (as in a diamond magic staff or grappling hook is superior to a ruby one). Amber can also be found but only by putting silt, slush or desert fossils into an Extractinator.
* TheComputerIsACheatingBastard: These aspects of ''Terraria'' can be seen as unfair, seeing that the enemy [[MyRulesAreNotYourRules does not have the same restrictions as you.]]
** A significant number of enemies can fire through walls and teleport at will.
** CollisionDamage is in full effect in this game. This is even more infuriating if playing the new Expert Mode, introduced in the 1.3 update, with a fresh character. You will fairly often find yourself juggled to death in only a few hits, and each of those hits will knock you into even more cheap hits or over a high cliff plummeting you to your death.
** In Expert Mode, you lose 75% of your money when you die. To make things worse, enemies can pick up your dropped cash. This is not a problem if you die next to your spawn point, but if this occurs far from your spawn point, the enemies with your money will despawn, taking your [[LostForever hard-earned cash with them.]] It ends up being very frustrating if this happens to you if you do not have access to a piggy bank yet.
** [[spoiler:The [[FinalBoss Moon Lord]]]] is the only enemy that can stop you temporarily from benefiting from life-stealing abilities. Only with extreme preparation and buffs to mitigate damage can you have a fair shot at beating him.
* ConcealedCustomization: The game allows you to choose a hairstyle and hair color (sometimes with facial hair) for your character. It even lets you use the entire 24-bit color spectrum to do so. But once you get that first helmet, kiss that hair goodbye (including the facial hair), as there's only one sprite for each equipped helmet and that sprite has no hair. Fortunately averted once the Clothier arrives and sells you an item that conceals your helmet.
* ConjoinedTwins: There's a boss literally named "The Twins" that takes the form of two giant eyeballs. A band of flesh runs between them when they're close together, but this is purely cosmetic and they still have free movement.
* ContinuingIsPainful: The game is similar to ''Minecraft'', with differences between difficulty levels:
** Softcore mode: You only drop a percentage of the money you're currently carrying. [[note]]It's half of each type of coin, rounded down to a minimum of 1, so you can lose anywhere from just under half of your money to nearly all of it.[[/note]] It's quite easy to avoid this, by keeping all your money stored in a chest or a safe, as your money isn't needed when you're exploring.
** Medium-core mode: You drop everything you're carrying, including items. This can be problematic if you managed to die while deep underground, as the items might be very difficult to reacquire (or might be even lost forever if you happened to drop them in lava). Update 1.3 added a big red X on the minimap to show where you died last, to make it easier to find your dropped items.
** Hardcore mode: FinalDeath. Everything you were carrying or wearing, everything in your safe and piggy bank, and all your mana and health upgrades are lost forever. However, you can create a new character in the same world, and retrieve anything you had stored in a chest.
* ContractualBossImmunity: Averted. Most bosses are vulnerable to debuffs, proper use of which can make them much easier.
** The Destroyer is an exception, being immune to all debuffs.
* ConvectionSchmonvection:
** The player can survive in a full suit of heavy armor near lava or exposure to fire just fine. Even the various fire weapons do not cause damage by exposure to heat but strictly on contact with the item in question.
** You can carry lava around in iron buckets. And lava doesn't damage wooden blocks or walls, just wooden platforms, and it only knocks them out of place, allowing you to pick them up and place them back afterwards.
* CoolGuns: The Minishark's tooltip describes it as "Half shark, half gun, completely awesome". There is also a hardmode variant called the Megashark and [[spoiler: The Moon Lord]] has an 11.11% chance to drop the Space Dolphin Machine Gun.
* CoolHelmet: Many of them look cool to wear, especially the hardmode helmets.
* CoolShades: Demon Eyes have a very low chance to drop a dark lens, which can be used to craft these. If you wear them, the sun gets a pair too!
* CoOpMultiplayer: Built from the ground up to support it. It can make fighting some particularly tough bosses easier, though it should be noted that the game scales up difficultly based on how many players are in a world.
* TheCorruption: There are three biomes that behave in this fashion. One bears the exact same name as this trope, ''the Corruption''. The second is ''[[MeatMoss the Crimson]]'' which, while [[BloodyBowelsOfHell differently-themed]] and with different enemies, also spreads. The third is ''Hallow''; a spreading "[[LightIsNotGood light biome]]."
* CouchGag: When the game is in windowed mode one of a number of silly subtitles will be displayed next to the title, such as "Terraria: [[VideoGame/BarkleyShutUpAndJamGaiden Shut Up and Dig Gaiden]]!"; "Terraria: [[VideoGame/{{Diablo}} There Is No Cow Layer]]"; and "Terraria: [[DepartmentOfRedundancyDepartment Terraria: Terraria:]]"
* CrapsaccharineWorld:
** Terraria ''looks'' friendly and cheery, but you will quickly learn otherwise. Undead roam the land at night and are constantly active underground, and a land disease called TheCorruption is filled with many an EldritchAbomination as it slowly consumes all in its path. And this is to say nothing of the bosses, ''[[UpToEleven especially]] [[ExactlyWhatItSaysOnTheTin Wall of Flesh]].''
** The Corruption's SuspiciouslySimilarSubstitute, the Crimson, is even worse. See BloodyBowelsOfHell above.
** Unless you install elaborate quarantine measures before defeating the Wall of Flesh, your entire world is doomed to become a mixture of two different Crapsack Worlds in hardmode: the Corruption[=/=]Crimson is still there and made harder, and then there's also "[[LightIsNotGood The Hallow]]" which plays CrapsaccharineWorld much more straight.
** To be more precise, The Hallow is a biome filled with pearly sands and stones, pretty cyan grass, trees in all colours of the rainbow, constant actual rainbow in the background, populated with pixies and unicorns who will ''murder you with extreme prejudice''.
* CrazyPrepared:
** Players can invoke this when they do a lot of prep work before boss fights, such as setting up an arena with wooden platforms you can jump around on. While it does take a long time to set up such things, it can often mean the difference between dying repeatedly, or the boss being a walk in the park, to the point that fighting a boss unprepared borders on SelfImposedChallenge.
** On a similar note, preparing one area with traps for the goblin/pirate invasions will make the otherwise long slugfest easier, such as setting a lava trap to force them to walk on it to get to you on both sides. If you build it correctly, virtually all of the invaders will die before even reaching you. If you're worried about the safety of your [=NPCs=], you can build your house/fortress high in the sky, or well away from the center of the map. You can also build said traps far away from where your house is, and the enemy will follow/spawn near wherever you're at.
** Players who are savvy to the way the Corruption and Crimson spreads can cordon off sections of their world in order to minimise the spread, and can also deliberately induce Hallow to the landscape to protect certain biomes, like the Jungle.
* CreepyCentipedes: Crawltipedes fought at the Solar Pillar. They fly around, ignoring grounded players, but [[AntiAir as soon as a player goes airborne]] they rapidly home in like a missile on crack, dealing incredible CollisionDamage to them ''per hit''. And like [[Franchise/TheLegendOfZelda Moldorm]], their only weak spot is [[AttackTheTail the tail]].
* CriticalHit: Each weapon has a chance of inflicting one for double damage.
* CriticalHitClass: With the right equipment and accessory modifiers, you can boost your critical hit chance to around 70%, making attacks that much more devastating.
* CriticalStatusBuff:
** The Frozen Turtle Shell provides a 25% damage reduction once a player drops below half health.
** The Cute Fishron, an Expert Mode mount, gains a huge speed boost (turning it into the fastest mount in the game) and provides the player with 15% more damage once the player is below half health.
* CrueltyIsTheOnlyOption:
** You're gonna have to sacrifice your Guide by dunking a Voodoo Doll of him in the lava pools of the Netherworld if you want to summon the boss that allows you to progress into Hardmode.
** Likewise, repeat battles with Skeletron require using the Clothier's voodoo doll to kill him.
** Ditto if you want to "rename" [=NPC=]s.
* CuteMonsterGirl: The [[HarpingOnAboutHarpies Harpies]]. Despite their appearances, though, they are otherwise the hateful creatures you would expect them to be. There are also "Lost Girls" who turn out to be vicious Nymphs.
* DamageIncreasingDebuff: Broken Armor and Ichor reduce defense, causing attacks to deal more damage.
* DamageReduction: Defense essentially acts as this- for every 2 points in Defence (1.5 in expert), the player or enemy takes one less damage from attacks. Attacks will still inflict [[ScratchDamage at least one point of damage]], however.
* DamageSpongeBoss:
** The King Slime is essentially just a larger and much rarer blue slime. Its only attack is to slowly hop at you. In 1.3, the King Slime was given the ability to teleport to your position if it can't reach you, meaning you can't cheese the fight by sitting in a hole in the ground any more.
** The Destroyer has more health than anything in the game save the final boss, despite being one of the first three hardmode bosses. This is balanced out by all of its sections sharing a single health pool, so it loses health faster than a single, non-composite entity would.
* DamnYouMuscleMemory:
** Intentional steps seem to have been taken to avert this for immigrating ''Minecraft'' players; the WASD controls map intuitively, and even the discard button is in the same place.
** There is the fact that destroying items and placing them are the same button but it depends on the item/tool held.
** ESC brings up the inventory and the option to quit or change teams, while the E key brings up the inventory in ''VideoGame/{{Minecraft}}'', although fortunately, there's a control config, so you can map map the inventory to F, E, or whatever you want.
** Unfortunately for seasoned ''Minecraft'' players, Shift-clicking an item will put it in the inventory's Trash slot, permanently deleting any item already there, where in ''Minecraft'' it quickly transfers items between hotbar and inventory, and to and from containers. It's easy to delete several important items before realizing the mistake.
*** This oversight has been fixed as of 1.3.0.3.
** Since 1.1, the control for throwing a held item (not in inventory) has been changed.
** The default keyboard "drop" key is T in ''Terraria'', while in ''Minecraft'' T is the chat key. Now, enter a multiplayer server...
** In 1.2 the Mana Regeneration key has been changed to J, with the map now being allocated to M, Unless you have a Mana Flower, You'll be accidentally pulling up the map every time you want to use a magical weapon for extended periods of time
* DarkReprise: The Underground Corruption theme is a trippy, sinister remix of the Corruption theme combined with elements from the regular Underground theme. The Underground Crimson theme is an even more creepy and sinister remix than the Underground Corruption, combining the Crimson theme with the Underground theme.
* {{Deadly Disc}}s: The boomerang-class weapons, the Thorn Chakram, Fruitcake Chakram, and Light Discs.
* DeathFromAbove:
** The Starfury, Star Cloak (and by extension the Star Veil and Bee Cloak) and Holy Arrows are all gear that can summon falling stars to ravage the battlefield.
** Also, at night stars will randomly fall through the land, instantly killing any monster on the way and, with some luck, severely damaging bosses.
** When mining straight down, it's not uncommon for monsters to spawn out of sight above you and dive down the mineshaft.
** Players can trigger a trap that drops a boulder upon you and cannot be survived without decent gear, making it literal Death from Above.
** Various flying or jumping enemies utilize their mobility to deliver attacks from on high.
** The players can use cannons to rain fire on enemies.
** There are any number of situations where the players will find themselves at the mercy of an enemy attacking them from above.
** At least two traps found in the Lihzahrd Temple come from above. The Spiky Ball Trap which rains bounding spiked balls from above and the spear trap which shoots out spears that stab from above.
** The player can do this once they acquire the Blizzard Staff and/or the North Pole. Both can be manipulated to wipe the screen of enemies due to their endgame-tier damage.
** The Lunar Flare. Similar to the Blizzard Staff, except that it has even higher damage, block-penetrating ability, and can be manipulated to hit a specific or general area of the screen.
* DeathIsCheap:
** Subtly [[SubvertedTrope subverted]] with the [=NPCs=] as they respawn, but it's a different [=NPC=] with a different name [[InexplicablyIdenticalIndividuals that just happens to look the same and do the same job]].
** The penalty for dying in softcore mode is loss of coins, though it may not seem cheap if a player loses a piece of platinum or two. The upside is that players can attempt to recover their lost coins, mitigating the loss. Unless the player's coins fall into lava and are destroyed.
** Medium core causes loss of inventory items and, much like the lost coins, can possibly be reclaimed unless they fall into lava. Fortunately, most of the rarer items [[AntiFrustrationFeatures can tolerate a dunk in lava no problem]].
** Averted for hardcore players. Should you die, you're KilledOffForReal, and while you can wander around the map as a ghost, upon exiting the world that character gets deleted. And since leaving a world destroys any items that are left lying around, you can't get your equipment back, either.
* DeathOfAThousandCuts: The only way to bring down the Dungeon Guardian, as his defense reduces all damage to 1.
* DeathWorld: Don't let the colorful, 2D graphics deceive you—the randomly-created worlds are Death Worlds, one and all. Killer slime can be found in the safest environments. Vultures, sharks, hornets bigger than you are, killer bats, and even piranhas await you above ground. Razor-sharp feather-slinging harpies inhabit the upper atmosphere. The underground is filled with skeletons, killer roots, vampire bats, and far enough down, demons. The hills and caverns are steep enough that you can die from fall damage just by traversing the terrain, not to mention the risks of drowning or falling into pits of lava. Meteors and Hellstone will burn to the touch unless you've built a charm to ward them off. Legions of zombies and enormous, disembodied eyes will pound at your door all night, every night. Eventually, an army of goblins will descend upon you with little warning. And every night has a chance for the Blood Moon to rise, increasing the number and might of the zombies, and turning even the harmless bunnies of the wilderness into walking horrors. The first instructions you get upon starting the game are on "surviving your first night."
* DemBones: The list of skeletal enemies in the game goes as follows: the Skeleton, the much tougher Angry Bones, the Dark Caster, Tim, the Undead Miner, the flying Cursed Skull (and the Dragon Skull on the console version), the burrowing Bone Serpent, the Armored Skeleton, the tougher Heavy Skeleton, the Skeleton Archer, Skeletron, formerly the game's toughest boss, and his mecha-version, Skeletron Prime. You spend a ''lot'' of time battling skeletons in this game. Version 1.2 introduces skeletal Necromancers, Tactical Skeletons, Bone Lee, and Skeleton Commandos, as well as others.
* DepartmentOfRedundancyDepartment:
** There is a an [=NPC=] during Christmas called [[ExactlyWhatItSaysOnTheTin Santa Claus the Santa Claus]].
** Due to the way item reforging works, you can end up with:
*** Demonic Demon Scythe
*** Armored Armor Polish
*** Spiked Shoe Spikes
*** Lucky Lucky Horseshoe
*** Lucky Lucky Coin
*** Deadly Deadly Sphere Staff
* DepletedPhlebotinumShells: While better ranged weapons do more damage, so does better ammunition. As you fight increasingly stronger enemies, wooden arrows and plain musket balls won't be enough. Players will soon find themselves creating or looking for [[AbnormalAmmo Jester's Arrows]] and [[SilverBullet Silver Bullets]]. Once you hit Hardmode, players begin to look forward to [[KillItWithFire Cursed Flame Rounds]], or even crystal shards to make ''fragmentation rounds''. 1.2 ups the ante of unique rounds such as explosive bullets, [[HomingProjectile chlorophyte bullets]], high-velocity rounds, nano bullets (confusion), venom bullets, ichor bullets, [[BlingBlingBang golden bullets]] and confetti bullets just to name a few. Yes, it ''is'' as cool as it sounds.
* DepthPerplexion: Fire Imps and caster-type enemies can throw fireballs in front of blocks, but most of your projectiles get blocked by them.
* DestructibleProjectiles: The Dark Caster, Fire Imp, Goblin Sorcerer, and Tim create wall-penetrating projectiles that are coded as {{One Hit Point Wonder}}s.
* DidYouJustPunchOutCthulhu:
** Many of the bosses are bits of Cthulhu (such as the Brain or Eye) or have titles that convey some kind of eldritch power.
** Then there's the TrueFinalBoss as of 1.3, [[spoiler: The Moon Lord. It resembles Cthulhu itself, and WordOfGod states that he's Cthulhu's brother.]]
* DifficultButAwesome:
** Flails can be incredibly fiddly to use and awkward to aim, but once you master them, especially the Dao of Pow, you can become almost unstoppable. They pierce foes, rebound, and deal lingering damage around the ball head, making them incredibly deadly against larger and/or segmented foes. The second-best damaging flail, the Dao of Pow, also has a chance of confusing enemies. The Flower Pow does slightly more damage and its flower (which is the spiked ball) shoots petals at nearby mobs as long as it is out.
** The Coin Gun is normally an AwesomeButImpractical money waster. However, if you only shoot Silver Coins, it can become a completely self-sufficient weapon, easily making back the money it shoots. Shooting Silver Coins, however, is trickier than it sounds, and requires constant attention to your coin count.
** Yoyo-class weapons introduced in 1.3 have some major drawbacks: limited spin time [[labelnote:Explanation]]except for endgame yoyos, which have unlimited spin time[[/labelnote]], lack of auto-swing to re-release them when they wind back, and relatively small hitboxes. This is balanced out by the fact that they deal continuous contact damage like flails but with much greater control, they follow your mouse cursor so you can easily track enemies until the yo-yo retracts, and their small hitbox combined with mouse control allows you to guide them around corners and even through 1-block wide holes, allowing you to attack from behind cover. They also have a number of accesories that improve their usability [[labelnote:Explanation]]like Counterweights that add more orbiting projectiles, the Yoyo Glove that can cause a second yoyo to be deployed when you attack a monster, and the Yoyo String that improves the reach of your yoyo[[/labelnote]], and all of them can be combined together into the Yoyo Bag to save equipment slots. Once you're kitted out and fully-familiarized with Yoyos, they can easily rival or even surpass Flails under certain conditions.
* DifficultySpike: The jump from regular to hardmode will generally kill all but the most prepared players, as even the best weapons from before barely scratch the new enemies found everywhere.
* DirectionallySolidPlatforms: Wooden platforms which can be crafted. Players can jump up through them like it's nothing, and walk across them fine, or choose to drop through by pressing down. Some monsters are also incapable of passing downwards through them.
* DiscountCard: Present as a rare drop during pirate invasions; equip it as an accessory to get 20% off on all purchases. Normally it wouldn't be anything too major, but there are some items completely unique to [=NPC=] vendors such as purification powder, yellow pressure plates (a unique variant of pressure plate not found in a game world), and certain crafting stations. There are also items that are findable but rare, like bullets, making a Discount Card very handy for maintaining an inventory.
** The Discount Card can be combined with a Greedy Ring (itself a combination of a Lucky Coin and Gold Ring) in order to give it the additional abilities of attracting dropped coins in a wider radius and making enemies drop extra money when hit.
* DiskOneFinalBoss: The Wall of Flesh is the strongest boss until you realize that killing it is going to turn the surface into a mixture of [[CrapsackWorld Crapsack]] and CrapsaccharineWorld roamed by twisted, powerful creatures...
* DiskOneNuke:
** Shuriken can be bought very early in the game as soon as the Merchant shows up. The merchant is usually the second [=NPC=] to appear in the player's house. Shuriken are inexpensive, do decent damage, have high attack speed, high range, go through any enemy they hit, hitting large enemies twice or three times in the process, and have a chance to be able to be recovered and used again.
** {{Molotov Cocktail}}s. With a little Sand, Stone, Wood, Gel, Cobwebs, and Iron, you can make these fairly early. [[labelnote:Crafting information]]Use the Iron to make some Chains, which can be used to make a Sawbench, which gives you access to the Keg and Loom. Smelt the Sand into Glass, shape it into Mugs with a Stone Furnace, and then fill them at the Keg, spin the webs into Silk with the Loom, and craft some Torches with the wood and Gel by hand. Each piece of Silk and Torch for every ten mugs of Ale makes ten Molotovs.[[/labelnote]] They do a ''lot'' of damage for the early game, and the only consumable ingredients you need for the molotovs themselves are the wood, gel, sand, and cobwebs. [[labelnote:Material hints]]Woods can be farmed by planting trees, Sand can be generated by either using Antlions that spit Sand Blocks, or by using the Sandgun to fire Sand Blocks while using ammo-saving equipment and buffs, gel can be farmed from Slimes and Slime Statues, and Cobwebs spawn endlessly inside Spider's Lair Biomes underground.[[/labelnote]] These improvised firebombs make short work of pretty much every monster and even some bosses before you enter Hardmode. The 1.3 Big Update adds Pink Gel to the ingredient list and reduces the raw damage, but molotovs still remain a powerful tool in pre-hardmode Terraria.
** The floating islands early on. You could find the indispensable, fall-damage-removing Lucky Horseshoe, the [[DeathFromAbove powerful Starfury]], or the jump-improving Shiny Red Balloon, as well as large amounts of Gold/Silver ore, from which you could make better armour out of in the early game. This is partially balanced out now by the existence of the harpy enemies who spawn at that level and attack player as long as they are up that high. 1.2 makes it even more worthwhile to raid Floating Islands, as you can now harvest ''actual clouds'' and Skyware deco furniture and bricks in addition to the loot in the chests.
** Receiving Platinum Coins out of the Extractinator essentially gets rid of pre-hardmode money concerns.
** Christmas Presents and Halloween Goodie Bags can give a serious headstart to any player's arsenal, in addition to seasonal random drops. Getting, say, the Red Ryder rifle from a present even ''before'' you go Underground for the first time is entirely possible, as is randomly getting the Machete from some mook at a similar time.
** Daring players can wade into the Ocean in hopes of finding a Water Chest with a Trident inside. That trident, with all the benefits of the Spear class of melee weapons, will have enough attack power to last you a good while in pre-hardmode Terraria. If you're even more prepared, you can even bring a Recall Potion (that is easily found in Surface wooden chests) and teleport straight out of the sea before you run out of breath and escape mostly unscathed with your loot.
** If you're canny enough to survive in the Marble Cave mini-biome, Hoplites drop Javelins and Medusas may drop their heads. Javelins are strong throwing weapons for the early game and are dropped in large amounts by Hoplites, while Medusa's Head is easily one of the strongest pre-hardmode Magic weapons in terms of single-shot (chargeable) damage. Several players have reported easily stomping the Eater of Worlds or the eyeball minions of Brain of Cthulhu with just a few quick fully-charged blasts from the Head. (Un)fortunately, Medusa has become a Hardmode-only monster in the May 22, 2016 update, making their heads no longer available before Hardmode, while at least Javelins remain.
** Fishing can net you several helpful items as soon as you can get some bait and a rod together. In addition to items you can fish up (such as potion ingredients, explosive Bomb Fish, and a jump-enhancing Balloon Pufferfish), you can also get crates, which can contain further items like the Tsunami in a Bottle, which grants a second jump, or the Falcon Blade, a fast and powerful (if somewhat short) sword you can get well before you can craft anything that surpasses it. Fishing in the Ocean biome may nab you a Reaver Shark, a very powerful (pre-Hardmode-wise) pickaxe that can mine the first set of Hardmode ores.
** Ice Golems can be fought as soon as you enter Hardmode and enter a blizzard. They drop the Frost Staff, a decent magic weapon, Ice Feather, which are used to craft high-tier Frozen Wings, and Frost Core, which, with Adamantite, Titanium or Hallowed Bars (depending on the world and game version), allows you to craft Frost Armor.
* DoppelgangerSpin:
** The Lunatic Cultist will occasionally summon copies that, if struck, will cause an extra minion to be summoned.
** In Expert mode, Brain of Cthulhu will create three illusionary copies of itself in its second phase to confuse the player as it charges.
* DoubleJump: A Cloud in a Bottle allows you to double jump. Doing so will also negate fall damage if done near the bottom of a long fall. Version 1.2 adds more Elements In A Bottle, a Blizzard and a Sandstorm, which are improved versions of the Cloud. You can combine these items with the Shiny Red Balloon to get even better jumps, and them fuse them all together into a Bunch of Balloons to get a ''quadruple'' jump, and combine ''that'' with the Fart in a Bottle/Balloon to get a ''quintuple'' jump. Version 1.3 adds the Tsunami in a Bottle, which can be combined with a Balloon Pufferfish to get the Sharkron Balloon, which will let you achieve ''six'' midair jumps. Watch out for fall damage though. Or, don't, if you have a Lucky Horseshoe equipped.
** There's also the unicorn mount, which has a double jump of its own, bringing the potential number of jumps up to a whopping ''seven''.
* DropTheHammer:
** Much like axes, hammers are not particularly strong as they are intended as tools, but can be used as weapons if necessary.
** Hamaxes, items that combine the functionality of hammers and axes, are more effective weapons and can be used to defend yourself while shaping terrain or chopping down trees.
** The Paladin's Hammer is a powerful thrown hammer weapon. The Paladin enemy who drops it throws said hammers at the player, albeit in a different nature.
* DualBoss: The Twins. One of them, Retinazer, shoots [[FrickinLaserBeams Frickin]] EyeBeams while the other, Spazmatism, pursues you and breathes hellfire at you.
* DugTooDeep: Players can dig right into the Underworld, a hellish biome composed of ashen landscapes dotted liberally with lava pools and chock full of demons, fire bats, imps, and lava slimes. It's also the area that the pre-hardmode boss is found and fought in.
* DummiedOut: Several items intended for use in testing various elements of the game. Mostly ludicrously overpowered weapons and armor so they didn't have to worry about enemies.
* DungeonCrawling:
** The Dungeon is located on the far left or right side of the map, and you must defeat a boss to enter it with out being {{One Hit KO}}ed by a flying skull. The Dungeon holds many rare items that can't be found in other places, and is filled with traps and dangerous enemies.
** The Lihzahrd temple in the depths of the jungle. Although much smaller and more linear, the enemies are even stronger and the traps are easily capable of killing players not watching where they step.
* DungeonShop: The Skeleton Merchant [=NPC=] randomly spawns underground, selling basic supplies and a few unique items, and allowing a player to sell items without returning home. However, he never appears if the player is actually in the Dungeon.
* EarlyBirdBoss: Several bosses can summon themselves when the game thinks you're ready.
* EasyLevelsHardBosses: The bosses are orders of magnitude harder to beat than anything a player will have seen up to that point. Some bosses are so difficult that an accepted strategy is to set up an entire arena (usually out of wood planks) solely for the purpose of neutralizing some of their advantages. Fortunately for the player, most of them have a specific trigger event and won't show up unless you deliberately summon them, or at least until you do something you shouldn't be able to do until you're reasonably well-equipped, though you can easily break that if you choose to prioritize making better tools over making better armor and weapons. A good example is the Eye of Cthulhu, the first boss in the game. It is summoned automatically at night once your character has certain values of health, defense, and three [=NPCs=], which is very easy for a player to do without having the weapons necessary to fight it off. It can fly and travel through solid objects, so early game characters are likely to have a hard time even hitting it, let alone killing it.
* ElaborateUndergroundBase: [[AnInteriorDesignerIsYou You can, of course, build one]]. The Dungeon itself also qualifies since it goes from the surface to near-Underworld level.
* EldritchAbomination: [[CaptainObvious The Eye of Cthulhu]], the Brain of Cthulu, the Wall of Flesh, and [[spoiler: The Moon Lord]] are the most extreme, but most of the bosses qualify.
* ElectricJellyfish: 1.3 gives the Jellyfish enemies an electrical shock attack. On Expert, they can also [[InvulnerableAttack electrify themselves for temporary invincibility]].
* ElementalCrafting: You start out with Wood, then move up through Copper/Tin, Iron/Lead, Silver/Tungsten, Gold/Platinum, Demonite/Crimtane, MeteoricIron, Hellstone, Cobalt/Palladium, [[{{Mithril}} Mythril]]/{{Orichalcum}}, Adamantite/Titanium, Hallowed metal, Ectoplasm, Shroomite and Chlorophyte, and finally Luminite.
* EmergentGameplay:
** A number of player-created innovations, including the Hellevator and the Skybridge/skyway.
** Monster/invasion proof housing which may include teleporters for both the players and [=NPCs=].
** Various housing defenses and monster grinders.
** Lava, water, and honey generators which make infinite amounts of each liquid as well as the results of mixing the liquids together.
* EncounterBait: The Battle Potion, which increases the spawn rate by 50% and doubles the maximum spawn limit (The amount of enemies on screen). Holding a water candle (in 1.2, also just being near a placed one) out also does a similar effect. There's also the Calming Potion, which does the opposite.
* EnergyBow: The Pulse Bow changes any arrows it uses into energy bolts that can ricochet and pierce through enemies.
* EpicFlail: There are several large morningstar-style weapons in the game, the best of which can set enemies on fire or confuse them. The player can craft some of them, like the Meatball and the Dao of Pow.
* EquipmentBasedProgression: Your character's abilities come entirely from whatever gear you happen to be wearing.
* EscapeRope:
** The Magic Mirror, which sends you back to your spawn instantly.
** The King and Queen statues can be used to rescue stuck/endangered [=NPCs=].
** Version 1.2.4 adds the Recall Potions, which work like the Magic Mirror only they don't use your mana and activate slightly faster.
* EventFlag:
** Destroying a Shadow Orb in the Corruption with a hammer enables the chance of a meteor falling in your world and is one of the necessary conditions for Goblin Armies to begin appearing. Shattering three of them summons a boss monster called The Eater of Worlds. After it is defeated or you die you have to smash another three to do this, or just use an easily crafted item to summon him at will. In a world with the Crimson, smashing the beating Demon Hearts will do a the same thing, although they will summon the Brain of Cthulhu instead.
** Getting 200 health without fighting The Eye of Cthulhu (along with other conditions) can trigger an event where the Eye can spawn by itself. If you force summon him after you get the event flag but before he shows up, two Eyes can show up.
** Simply getting more than 120 health, which means using your first life crystal, makes blood moons possible.
** Defeating the Wall of Flesh activates Hardmode, where more powerful enemies spawn, and old bosses return with a vengeance, as well as making new ores available by destroying demon/crimson altars with the Pwnhammer dropped from the Wall.
** Defeating all three mechanical bosses at least once each causes Plantera bulbs to spawn in the Underground jungle.
** Defeating Plantera causes hardmode level enemies to spawn in the world's Dungeon.
** Defeating Golem causes the Cultists to spawn at the entrance of the world's Dungeon.
* EverythingFades: The gibs from dead creatures disappear after a few seconds.
* EverythingsBetterWithRainbows: Lots of rainbows are in ''Terraria''. One is in the background of the Hallow. Rainbow Slimes appear in the Hallow when it rains, and drop Rainbow Bricks to build with. The Merchant sells Disco Balls that give off rainbow-colored light. The Rainbow Rod, Rainbow Gun, and Last Prism are all magic weapons that let you kill enemies with rainbows and another Rainbow Magic Weapon, The Rainbow Crystal Staff can also be obtained from the same source as the Last Prism. You can also dye your hair and clothes with rainbow dye.
* EverythingsBetterWithSparkles: Most types of magic sparkle, some weapons sparkle when swung (others leave fire trails), and the Mythril armor (and the Hallowed armor it is crafted into) is special in that it generates sparkles in response to light. Ores, gems, coins, golden/shadow chests also sparkle up when a light source is cast on them. Hunter potions cause enemies and [=NPCs=] to glow and sparkle while spelunker potions cause any sort of treasure to glow and sparkle even without a light source.
* EvilIsNotWellLit:
** When going into the Corruption or Crimson, the sun will become dim.
** There's also solar eclipses in hardmode, which are about as dark as night and spawn hordes of old movie monsters that want to tear your face off.
* EvilIsVisceral:
** The Wall of Flesh.
** The Crimson Biome too, which is a fleshy, MeatMoss alternative to TheCorruption that also ''spreads into its surroundings''. Inhabitants include flesh-based monsters like the [[GiantSpider Blood Crawler]], [[NightmareFace Face Monster]], Crimera, Herpling, Ichor Sticker and the Brain of Cthulhu.
* ExclusiveEnemyEquipment: Several sets of equipment that only drop from rare enemies who wear them, like the zombie bride's wedding set or Tim's wizard hat. Most are [[AndYourRewardIsClothes vanity items]] which only change the look of your character.
* ExpectingSomeoneTaller: Lampshaded by the Tinkerer:
--> '''Tinkerer:''' I thought you'd be taller.
* {{Expy}}[=/=]PaletteSwap: The character sprites in alpha were rather blatantly based off of ''VideoGame/FinalFantasyV'' combat sprites, but they were thankfully changed for its release on Steam to avoid a lawsuit from Creator/SquareEnix.
** [[spoiler: The Moon Lord]] is obviously [[spoiler:Cthulhu]].
* EyeBeams:
** Retinazer shoots lasers and in the second stage form turns into a giant laser gun.
** The eyes of the Wall of Flesh.
** The Solar Eclipse enemy Eyezor fires lasers from its giant eye.
** Ice Golems encountered during a blizzard in the ice biome fire lasers from their eyes.
** The Lihzahrd Temple boss The Golem fires lasers from its eyes.
** [[spoiler: The Moon Lord]] fires one from its middle eye. When the eyes get detached, they each can fire a smaller one too.
* EyeScream:
** A common enemy at night is the Demon Eye and its variations, which splatter into chunks when killed. Hardmode introduces Wandering Eyes, which, when injured enough, sprout a mouth in the center.
** The Eye of Cthulhu, one of the earliest bosses, especially considering its second stage replaces its pupil with a large mouth.
** The hardmode boss The Twins, a pair of giant evil eyes connected by what looks a nerve cord. When each eye reachs their second stage, they pop in a spray of gore. One sprays fire from its gaping maw and the other turns into a giant flying laser gun.
** Some plantlife in the Crimson biome are eyes in piles of flesh that pop when hit with a player's weapon or projectile.
** The final boss of the console and mobile versions, Ocram, loses his main eyes and grows a third once he TurnsRed.
** [[spoiler: The Moon Lord]], whose first stage consists of attacking the eyes in his hands and forehead until they come loose, leaving fleshy sockets behind.
* FacelessEye: The Demon Eye enemy that torments players who venture outside at night, and its KingMook the Eye of Cthulhu, which starts of as just a giant Demon Eye. [[EyeScream It then grows a mouth.]]
** In hardmode, we have Wandering Eyes, which are somewhere between Demon Eyes and the Eye of Cthulhu, and The Twins, twin bionic upgrades of the Eye of Cthulhu.
* FakeDifficulty: It's not as bad as some games, but there's quite a few cheap shots out there.
** Explosive traps in the underground will instantly kill you and anyone else in a 10-block radius, unless you have the absolute highest possible health and defense.
** [[TakenForGranite Medusas]] frequently spawn in marble caverns. They can turn you to stone without warning from a great distance away. In and of itself, this won't kill you, and it only lasts a few seconds; but until it wears off you can't do anything at all, and you're more vulnerable to the already-unforgiving fall damage. If you're not standing on solid ground (jumping, grappling, or riding a minecart) when Medusa sets her sights on you, you're likely to become a pulverized pile of gravel without getting a chance to defend yourself.
* FakeLongevity: Too many examples of [[RandomlyDrops equipment with 1% or worse drop rates]] that can make getting a perfect character far more frustrating than it should be.
* FakeUltimateMook: Cursed Hammers and Enchanted Swords are rare, startling, and look dangerous, but they can easily be stunlocked by smacking them with whatever weapon you have on hand. Rainbow Slimes are almost as big as King Slime and flash random colors; they do a lot of damage, but they have no special abilities and relatively low health, so they're not very difficult to kill.
* FallingDamage: Present; the damage you take increases depending on how far you've fallen. There's even a few death messages for when you die due to falling damage.
--> didn't bounce.
** Fortunately, there's several ways to negate fall damage. Landing in [[SoftWater 2-block deep pools of water]] or cobwebs does not incur damage (neither does falling in lava, but that has its own problems). This can be exploited by placing a block of liquid or a cobweb underneath you while falling.
** Using an item like a [[DoubleJump Cloud in a Bottle]], Rocket Boots, or a grappling hook resets your fall distance. Amusingly, grappling hooks still prevent fall damage even if you [[HitTheGroundHarder grapple onto the ground]].
** Featherfall potions and the Umbrella item slow your fall to speeds that don't incur fall damage. The Frog Leg increases the distance you can fall before taking damage and decreases the damage you take from falling.
** Finally, some items completely negate fall damage when equipped: the Lucky Horseshoe (and its variant, the Obsidian Horseshoe), as well as all types of Wings.
* FantasyGunControl: You have enchanted swords, water staffs, and Mario's fire flower, along with a shotgun, the laser rifle from ''Film/{{Aliens}}'', fully automatic crossbows, magic star cannons, and [[GatlingGood a minigun]] [[NinjaPirateZombieRobot that looks like]] [[ThreateningShark a shark]].
* FantasyMetals: The game has several made-up metals, such as "[[ThunderboltIron Meteorite]]," "Demonite," and "Hellstone," all of which can be melted into strong armor and weapons.
** In 1.1, Cobalt, {{Mithril}} and Adamantite were introduced, as well as a boss-dropped metal, Hallowed. In 1.2, we were gifted with slightly stronger alternatives to each: Palladium, {{Orichalcum}}, and, strangely, Titanium. Also added was Chlorophyte, a new jungle-based ore stronger than even Hallowed, and Crimtane, an alternative ore to Demonite, found in worlds with the [[WombLevel Crimson]] instead of {{The Corruption}}.
** Later, the Chlorophyte can be refined into Shroomite using Glowing Mushrooms or Spectre bars using Ectoplasm, but that would be the last you'd see of this trope from that point up until the TrueFinalBoss, which drops Luminite ore to be crafted into bars for getting the best-of-the-best armor.
* FeatherFlechettes: The Harpies attack this way, and can be difficult to deal with without a ranged form of attack back at them.
* FeaturelessProtagonist: The game sports a numerous amount of customizations for your character, meaning that you can add your own personal touch to the character so it looks the way you want it to. It's played straight in all of the [=NPC=] dialogue; the only aspect of your character which [=NPCs=] will comment on is gender, and even then not always.
* FertileFeet: 1.3 added the Flower Boots item, when worn it causes flowers to grow on grass that the player walks on.
* FighterMageThief: [[MyFriendsAndZoidberg And Summoner.]]
** Although there are no real classes, armor bonuses tend to benefit one weapon type with bonuses to damage and extra effects suited to that playstyle.
** The many varieties of Melee, ranged, magical and summon weapons cater to varying play-styles especially when matched with accessories and certain complete armor sets.
** Melee tends to be more focused on close-combat and tanking hits, ranged is more focused on long-range single-target attacks, magic has the most variety with attack patterns, but suffers from having low-defense armors and having to manage your mana supply, while summon focuses on being TheMinionMaster but also has low-defense armors.
** 1.3 introduced a ''fifth'' damage type, Throwing weapons (which were formerly Ranged). However, it doesn't have any armors and weapons to support it beyond the early parts of the game.
* FinalBoss: [[spoiler: The Moon Lord]]
* FinalDeath: In Hardcore mode, you will not be able to continue after your character dies. Unlike the ''VideoGame/{{Minecraft}}'' example, dying doesn't force you to delete the world, only the character, this means you can start another character to attempt to continue the game.
* FinalDeathMode: There's a difficulty system that increases the penalty for death the higher up you go. In softcore, you drop half your money. In mediumcore, you drop items. In hardcore, you die permanently, meaning if you had any items on you at the time, they're gone for good unless you're playing multiplayer or you had some stuff stashed in a chest.
* FireAndBrimstoneHell: The Underworld, which contains flame shooting fire imps, burrowing bone serpents, slimes made of lava and literally bats out of hell, and flying demons that relentlessly try to make you dead.
* FishingForSole: As of version 1.2.4, one of the "failure" items that can be fished up is an old shoe.
* FishingMinigame: Once you acquire a fishing pole and some bait, you can fish in any pool of liquid (even lava, although you'll need the Hotline Fishing Hook to fish there). You can fish a lot of different fishes: some of them are used for potions; others can be used as tools, weapons or food; and the Angler will give you special rewards if you give him a specific fish he's asking for. You can even get some crates, which may contain money, metal ores and bars, and potions, as well as a few special items.
* FishPeople:
** The player turns into one if you equip the Neptune's Shell and enter water, allowing you to move through it as if it were air.
** Icy Mermen are found in the ice biome underground in hardmode.
* FlamingSkulls: One of the numerous varieties of GoddamnedBats is one of these, and can usually be found in dungeon areas. Skeletron may drop a Tome that lets you cast these.
* FlamingSword: The Fiery Greatsword. Sunfury is a flail version.
** Equipping the Flame Gauntlet, [[SetBonus wearing the full set of Frost Armor]], or downing a Flask of Cursed Flames will add regular, frostburn, and cursed fire, respectively to your melee weapons. And yes, all three can be applied at the same time.
* FlechetteStorm: A group of harpies can easily inflict this on you if you're not careful. Some holiday-themed bosses also attack this way.
* FloatingContinent: The game has floating islands, which contain a building with some rare items inside.
** As with ''VideoGame/{{Minecraft}}'', it is not hard to make your own: build a small wall, mine out all but the top, and the top will just float there. This can be important in Hardmode, when the Corruption and the Hallow begin to spread, since they will not spread through a thick enough air gap—so if they become or are completely surrounded by these, they are contained. Or just mine out below the spawn point, so that anyone joining the world or respawning starts off somewhere safe.
* FloatingIsland: A type of biome consisting of small islands floating a few hundred feet above the ground, resting on beds of clouds. These islands are rich with ore, but each also features a small house built of exotic materials, decorated with banners and Skyware furniture, and containing a rare item in the chest inside.
* FloatingPlatforms:
** Played straight as well as justified in turns. Justified that underground you can place platforms attached to the (destructible) background wall. Played straight when the background wall is ''the sky''.
** With the Ice Rod weapon, you can make ''very'' temporary ones. However, you can use them as a wall to attach your not-so-temporary platforms to.
* FlyingDutchman: The mini-boss for the Pirate Invasion event, a flying ship that shoots with four cannons and can throw more pirates into battle. All four cannons must be destroyed to defeat it.
* FlyingSaucer: The Martian Saucer in the Martian Madness event. It can drop a Cosmic Car Key which allows you to ride your ''own'' FlyingSaucer- a very useful mount with infinite flight time.
* FlyingSeafoodSpecial: Flying Fish and Duke Fishron. Ichor Stickers and Gastropods may count if you consider them squid and jellyfish respectively.
* FreeRangeChildren: The Angler. Could explain why he's such a brat.
-->'''Angler:''' I don't have a mommy or a daddy, but I have a lot of fish! It's close enough!
* FriendlyFireproof: Notably also applies to explosives that can hurt the user, but not their teammates.
* FromASingleCell: Once Hardmode hits, the Corruption and the Hallow spread constantly. As long as one block of Ebonstone or Pearlstone exists within 4 blocks of a block of grass or stone, they will continue to spread. Additionally, destroying a Demon/Crimson Altar to spawn the rare ores will create a block of Corruption/Crimson somewhere in the world, meaning that it can literally grow from a single cell.
* FullFrontalAssault: The aggressive Nymphs aren't actually wearing anything at all. No anatomical 'details' are visible since this is a relatively low-res sprite-based game.
* FunctionalMagic: See {{Alchemy}} entry for more information.
* FungusHumongous:
** There are mushroom forests underground. You can even chop down the mushrooms and use them in a HealingPotion.
** 1.2 allows you to make mushroom houses, and the Glowing Mushrooms can now be grown on the Surface, producing a Mushroom Biome when you do so.
** The glowing mushrooms are treated as blocks and when placed next to each other as building materials can make giant mushrooms.
** There are also weapons that can allow you to do it as well, one prominent example being [[LifeDrain Vampire Knives]]
* GameBreakingBug: The Vita version, as of the 10/22/15, has a bug on saving that causes a crash to the Vita's main menu.
* GameMod: There's an active modding community.
* GardenGarment:
** The Dryad [=NPC=] has leafy clothing. She also can sell replicas of her clothing as vanity items as of the 1.2 Halloween Update.
** The Jungle Rose vanity item is a flower found in the jungle biome.
* GardenOfEvil:
** The Corruption blights the landscape, turning the sky a sickly yellow, causing plant life to become twisted and thorny, spawning nasty monsters called Eaters of Souls, and turning the nearly harmless Giant Worms into the deadly Devourer (and a much deadlier KingMook called the Eater of Worlds). Ditto for [[BloodyBowelsOfHell the Crimson]], which features [[MeatMoss fleshy vegetation]], spiderlike Blood Crawlers, Face Monsters, and the floating Crimeras.
** And for a version that [[LightIsNotGood disguises its true nature]], we have its equal and opposite number, the Hallow. Pretty, calm, has a giant rainbow in the background... and spawns warring Pixies that shred your hearts like a hot knife through butter, Unicorns that are eager to impale you, and, at night, Gastropods that riddle you with laser beams.
* GatlingGood: The Minishark, which can be bought at the Arms Dealer. Although thanks to a nerf, it's not quite the best weapon in pre-hardmode, it can be upgraded into the impressively deadly Megashark. The Travelling Merchant sells the Gatligator, which has an impressive fire rate but is rather inaccurate.
** The Space Dolphin Machine Gun: it came from the Edge of Space (which itself might be a reference to that game).
* GelatinousTrampoline: Downplayed with Pink Gel Blocks, which cause you to bounce when you land on them. They can't be used to gain height, but they do negate fall damage.
* GenderBender: 1.3 introduces Gender Change Potions crafted from all 7 herbs and a bottle of water.
* GettingCrapPastTheRadar:
** One of the possible responses if you're at full HitPoints and ask the Nurse for healing is "I don't give happy endings."
** The moon cycles through phases and on Blood Moons two of the female [=NPCs=], the Nurse and the Mechanic, become aggressive and irritable. The Dryad doesn't get as hostile, but does get snippy and sarcastic. The Steampunker just gets peevish. Oddly enough, the Party Girl is completely unaffected.
--->'''Nurse''': "Why are you even here? If you aren't bleeding, you don't need to be here. Get out."
** The Arms Dealer in particular seems to be the embodiment of the trope.
--->"Keep your hands off my gun, buddy!"
--->'''Mechanic''': "[Arms dealer's name] keeps talking about pressing my pressure plate. [[ObliviousToLove I told him it was for stepping on.]]"
** A 1.2 mob, the Nymph, is a ''nude'' female humanoid. Of course, no anatomical detail can be seen in the pixel art.
** There's a weapon called the Golden Shower. There is nothing more to be said.
** During the Pumpkin Moon event, there's a tough, fire-spitting tree called the Mourning Wood. ...Yeah.
** As of version 1.2.4, the Angler [=NPC=] will eventually give you fishing bait called the ''Master Bait''.
* GiantEyeOfDoom: The Eye of Cthulhu, and The Twins in hardmode.
* GiantHandsOfDoom: Skeletron is composed entirely of a head and two hands that collectively try to murder you.
* GiantSpaceFleaFromNowhere: Pretty much every boss, though you do have to summon most of them intentionally.
* GiantSpider: Wall Creepers, Jungle Creepers, Black Recluses, and Blood Crawlers, enemies that are about as long as the player is tall and can walk on background walls.
* GirlsWithMoustaches: The pool of possible hairstyles to choose for a character isn't limited by gender, so it's possible to have a female character with a beard.
* GlassCannon:
** Some enemies, such as the Meteor Head, deal unusually large amounts of damage for when they're encountered, but are otherwise fairly easy to kill.
** On the player side, dedicated Magic users shape up as this as the game progresses, as Magic-oriented armor sets tend to have the lower defense than Ranged and Melee armors, while Magic weapons are capable of dealing large amounts of damage.
%% Do not put GoddamnedBats here. Please click on the YMMV and add it to the existing entry on that page.
* GoForTheEye: The Wall of Flesh can be attacked in the eyes or the mouth, but the eyes have no DamageReduction and hence take much more damage from attacks.
* GogglesDoNothing: You can craft goggles out of two lenses (as in the [[OrganDrops organ itself]]), they do nothing more than give one measly point of defense so they're more for decoration than anything for your character. During [[HolidayMode Halloween]], the [[SteamPunk Steampunker]] sells steampunker goggles that are completely vanity only and their not even worn over the character's eyes compared to the former example.
* GoldMakesEverythingShiny: Gold chests have a special sparkly effect.
* GoldSilverCopperStandard: The game uses copper, silver, gold, and platinum coins. 100 coins of a lower denomination are equal to one higher-denomination coin. In fact, for ease of storage, 100 coins of a lower denomination can be ''crafted into'' a higher-denomination coin and when collecting coins, they automatically turn into the higher-denomination and the opposite occurs when buying from an [=NPC=]. How you craft a lot of copper into a little silver (or silver into gold, etc) is [[MST3KMantra best not thought about too much]].
* GoodLuckCharm: The Lucky Horseshoe looks like a traditional good luck charm. However, instead of affecting any luck-based aspect of the game, it negates fall damage and also serves as a crafting component for an advanced item called the Obsidian Horseshoe that also prevents Meteorite and Hellstone contact damage.
** Any accessory can be reforged to have the "Lucky" modifier, which increases your overall critical hit rate by 4%.
* GoodWingsEvilWings: You can craft a pair of each. But besides material and appearence, they do exactly the same.
* GoombaStomp: The Slime mount makes it possible to jump on top of enemies, damaging them and bouncing back up for another stomp.
* GottaCatchThemAll: Although not directly shown, players can make an optional objective of collecting every armor/vanity set or weapon and putting them on display, collecting all of the statues, or recording all of the music tracks in the game.
* GrapplingHookPistol: From the lowly grappling hook all the way up to the anti-gravity hook. Once you get one, it becomes an essential part of your arsenal.
* GravityIsAHarshMistress: It is extremely easy to fall to your death if you're not careful. Enemies are immune, of course.
* GreenHillZone: The normal overworld style until the Corruption/Crimson starts taking over.
* GridInventory: Similar to the one in ''VideoGame/{{Minecraft}}''. However, it also has 4 slots that you can use to store money, and 4 to store ammunition.
* GuideDangIt: The game does its best to avert this for early game players. If you show your Guide an item, he will tell you what can be crafted from it. But to spawn more [=NPCs=], you need to build suitable houses for them. Each house needs a table, chair/bed, light source, and back wall, and must be within a certain range of dimensions; and there are some arbitrary restrictions on building materials (which may be a bug). Beyond the table, chair, door, and light requirement, the game will only tell you whether a house is suitable or not; figuring out ''why'' it isn't suitable requires lots of trial-and-error.
** Finding the [[FloatingContinent Floating Islands]] is often so ridiculously time-consuming that many players simply cheat by downloading a map viewer. For those who view this as against the spirit of ''Terraria'', good luck. Floating Islands can spawn anywhere above a certain altitude, and it's incredibly difficult to tell where they can be found without building a skybridge (which takes a ton of resources), using up a lot of rope, or flying around in the sky with a [[GravityMaster Gravitation Potion]].
** Water Bolt, a spellbook hidden in the dungeon. It's hidden on the bookshelves in the dungeon, of which there are dozens, with nothing to draw attention to it other than its specific blue color. The only hint you get to its existence is that, if you're right on top of the shelf containing it, your mouse cursor will change when you mouse over it.
* GustyGlade: Oddly ''averted''. There is a wind mechanic in the game and viewing the weather using the weather radio or cell phone items can list it as getting pretty high, with speeds up to 70 mph being fairly common during storms, but the wind itself is purely cosmetic. It affects the movement of clouds in the background, the way that snow, rain, and bubbles move, and the direction of the North Pole's projectiles, but nothing else. It has no effect on player movement or even ranged weapon effectiveness.
* HairRaisingHare: The game has cute little bunnies that wander around the landscape and frequently get killed by enemy slimes or inadvertent player actions. However, during the Blood Moon, they transform into vicious purple [[http://terraria.gamepedia.com/Corrupt_Bunny Corrupt Bunnies]] (or [[http://terraria.gamepedia.com/Crimson_Bunny Crimtane Bunnies]] in Crimson worlds) with glowing red eyes. Only the Corrupt version drops a wearable bunny hood as loot.
** In the mobile version, you fight Diseaster Bunnies on Easter. They're just as dangerous as Corrupt Bunnies, and may drop a Suspicious Looking Egg. If that is used, it summons [[http://terraria.gamepedia.com/Lepus Lepus]], a huge rabbit boss that lays eggs that spawn more Diseaster Bunnies or a weaker version of itself.
* HandCannon:
** The Phoenix Blaster, the most powerful gun pre-hardmode. It can even outdamage the minishark with a fast trigger finger.
** 1.2 introduces the Venus Magnum, which is even more of a HandCannon and fires every bullet with a higher velocity than normal.
* HarderThanHard: Expert Mode, a world setting which makes the game significantly more difficult. Enemy and boss AI is improved. Enemies have twice as much health (150% for bosses) and do twice as much damage, which scales with the number of players in multiplayer. Certain enemies may inflict status effects (which will also last twice as long), some have new abilities (zombies may carry a weapon, for example), and bosses have new abilities and their existing ones improve as they lose health. Enemies can pick up dropped coins, and you have to kill them if you want them back. If you lost them at death, you likely aren't getting them back. Player life regeneration is cut in half, and you lose 75% of coins on death instead of 50%. On the plus side, there are several perks. Defense now blocks 75% of damage instead of 50% (functionally, you're still taking more damage because the enemy boost is higher than yours), rare loot is more common, and bosses drop exclusive items and possibly even the normally-unattainable developer items.
* HardModePerks:
** The best materials won't spawn until the Wall of Flesh is killed, turning on Hardmode for the entire world.
** Expert Mode rewards players by adding Expert Mode exclusive boss drops, which have a unique rarity tier of their own and have some amazingly powerful effects; [[WarmupBoss King Slime]] drops Royal Slime, rendering all slimes everywhere neutral towards you, Eater of Worlds drops a scarf that reduces all incoming damage by 17%, Wall of Flesh gives you an extra accessory slot, and that's just pre-Hardmode. It also makes certain drops more likely than they would be on a normal world.
* HarpingOnAboutHarpies: The game has harpies (sometimes spelled 'Harpeys') as a relatively common enemy on the heights where sky islands usually form. Their feathers are used for Gravitation potions.
* HaveANiceDeath: The game also does this to avoid confusion. Deaths leave tombstones that players can read, and even re-edit for the sake of comedy. Some of them are humorous; a lot are horrific.
-->Redigit was blown up by Blue's dynamite.\\
[Player] tried to swim in lava.\\
[Player]'s face was torn off by [[LightIsNotGood Unicorn.]]\\
[[=PlayerX=]] was brutally disected by [[=PlayerY's=]] Excalibur.\\
[Player] [[NotTheFallThatKillsYou didn't bounce.]]
* HealingFactor:
** Don't get hit for a while, and your health regenerates faster and faster. There are many ways to improve the rate, such as campfires and bands of regeneration.
* HealingPotion:
** There are varieties of Health and Mana potions the player can brew at an Alchemy Station, The lower-end potions can be bought, taken from pots and chests, or found in the dungeon. Higher-end potions must be crafted or looted from Hardmode bosses in large quantities.
** Players can combine the lesser or standard kinds to make a restoration potion, which restore both life and mana at once.
** Jars of honey now grant healing.
** Honeyfish grant a straight 120 health per use. They're a decent alternative to normal Healing Potions until you start collecting the Greater version.
* HealThyself: The game has standard healing potions in varying strengths. HyperactiveMetabolism is also at play in the forms of mushrooms and goldfish. However, all healing items come with a 60 second "Potion Sickness" debuff that prevents you from using another in that time.
* HeartContainer:
** The heart crystals, which when broken by a pick-class tool, give you a gem that increases your life by one heart (20 points) up to a maximum of 20 (400 points).
** 1.2 now has Life Fruit, which are found in the underground jungle during hardmode and can be eaten to increase maximum life by 5 (1/4th of a normal heart). Unlike Life Crystals, the fruit can only be used at 400 life or above, but they also extend your maximum life to 500.
** The same system is used for mana with mana crystals you can craft out of 3 fallen stars. (Decreased to 5 from the 10 needed to make one before 1.2, and decreased again in 1.3)
* HeartsAreHealth: Played straight. Enemies, pots, and certain powered statues generate a small red heart, that when picked up heals a portion of the player's health (unless it's during Halloween, in which the hearts turn into Candy Apples, or Christmas, where they turn into candy canes).
* HeartSymbol: Used to represent health in most cases. Crimson Hearts, found deep in the Crimson, are more anatomically correct in comparison, while the light pet they can drop are somewhere in between.
* HellIsThatNoise:
** The noise that the giant worms make when approaching you while you're alone mining can be particularly creepy, especially if you're using headphones.
** And the mummies, which have a much deeper, more ominous groan than almost any enemy in the game, despite being very easy to kill. Even the light mummies with the ^^ expression on their face.
* {{Hellevator}}: The term is used to describe any pit, shaft, or tunnel of any kind that leads ''directly'' from the surface (or very close to the surface) straight down to the very lowest level of the game world; Hell itself. No map is really complete without one. Digging several of them is also the easiest way to stop the spread of Hallow/Corruption after hardmode is activated.
* {{Hellfire}}: Cursed flames from the Corruption, apart from the name, fit this trope quite well: Water won't put them out, and they hurt a lot more than regular fire. Ichor, the Crimson counterpart, causes a defense debuff instead.
* HelloInsertNameHere: The game features such in the character creation and [=NPCs=] refer to the player by their name when talked to.
* HelloNurse: The Nurse, just like [[WesternAnimation/{{Animaniacs}} her namesake]].
* HelmetsAreHardlyHeroic: With the addition of the familiar clothing items. Players themselves can invoke this by wearing their armor like normal but hiding their helmets via the familiar wig item or [[GogglesDoNothing goggles]] in the social slot. Often used by players who chose a hairstyle with a beard, as wearing a helmet disables your beard.
* HitTheGroundHarder: Falls are annoyingly lethal without fall damage preventors. But, you can use a grappling hook to avoid damage by [[ArtisticLicensePhysics speeding into it quicker.]]
* HoistByHisOwnPetard:
** The various traps in the Lihzahrd temple can be used against the Golem, provided you harvest and rewire them to your benefit. It helps to set up a wall to protect youself from the traps.
** The Turtle armor, when equipped with its set, returns received damage.
* HolidayMode:
** In pre-1.2 versions on the PC, generating a new world during the Christmas season will have a chance to spawn you inside/near a Snow Biome. After the 1.2 Big Update, Snow Biomes spawn naturally in any new Worldgen. In addition, there is a special event during the season, the Frost Legion, that spawns a mob of killer Snowmen monsters, as well as the chance to invite a SantaClaus [=NPC=] to stay in your village. The 1.2.2 update added a special Christmas, event, the Frost Moon.
** After the Big 1.2 Update, there was a supplementary Halloween Update that added Pumpkins, in-season Goodie Bags, and a graphical change during the holiday that causes Zombies, Slimes, Demon Eyes, and Rabbits in costume to spawn. A special Event, the Pumpkin Moon, was also added to the mix, as well as a whole parade of holiday costumes.
* HollywoodDarkness: The game pays a lot of attention to lighting effects. The surface openings have light diffusing in, which can be obscured by hanging vines. If you venture much deeper than that, you'd better carry an ample supply of torch-building materials or some other light source. Even the surface gets pretty dark at night. Certain parts of the underground do have some ambient light, mostly supplied by glowing mushrooms or lava pools.
* AHomeownerIsYou: It may be 2D, but it's pretty similar to ''VideoGame/{{Minecraft}}''. You have '''so many items''' to pick from when [[AnInteriorDesignerIsYou customizing your home]], and, like ''Minecraft'', you build it from scratch, so it truly is ''your'' home.
* HomingProjectile:
** Chlorophyte bullets seek out enemies if they're close enough, and have a very good turning radius. This makes them really effective for aiming off screen (even with a Sniper Rifle) or for making every pellet of a Tactical Shotgun hit. If you do it right, they can even turn right around a corner.
** The Spectre Staff also shoots these.
** The Scourge of the Corruptor, despite being a Spear-class weapon, ''shoots'' tiny little corruptors that split into more of themselves that start to seek nearby enemies.
** The Christmas update adds the Snowman Cannon, a ranged weapon which shoots rockets as homing snowmen. The rockets are capable of making 180-degree turns to chase enemies, and will even seek out a new target in range if the first one is destroyed!
** The Possessed Hatchet that drops from the Golem is capable of this. If you throw it and an enemy is within line of sight, it will attempt to home in on it, provided there's nothing blocking its path. Thus it's capable of indirect fire, as you can hurl it over a wall, and have it hit enemies on the other side of it. The range is pretty impressive too, and it can even hit targets just slightly offscreen.
* HornetHole: Bee hives are randomly generated within the underground jungle, containing honey and a larva that summons the Queen Bee boss.
* HotBar: The game allows you to lock it to prevent items from being selected by an accidental click.
* HotWings:
** The Flame Wings, crafted with Souls of Flight and a Fire Feather, are available as soon as you defeat one mechanical boss, and they're better than most wings available at that point.
** The Solar Wings, one of the four end-game wings craftable after beating the final boss. As far as wings go, they have the absolute best stats, their only downside being they cannot hover.
* HumanSacrifice: This, of all things, is present in the game. Quote from The Guide: "In order to summon the keeper of the Underworld, you have to perform a live sacrifice. Everything you need to do so can be found in the Underworld." Little does he realise that what drops down there are Guide Voodoo Dolls...
* HumongousMecha: The Destroyer, a giant mechanical worm that stretches extremely long, fires lasers everywhere, and will release probes when damaged.
* HungryJungle: The Jungle biome, especially in Hardmode, is one of the most dangerous places you can go aside from the Underworld and the unlocked Hardmode Dungeon. However, certain goodies are only found there, including the ultra-material known as Chlorophyte. It is also home to the special bee hive and Lihzahrd biomes that hides powerful loot behind a boss.
* HyperspaceArsenal: The player can pack in a shocking number of weapons, ammo, explosives, and munitions into their personal inventory space.
* IconicLogo: The green tree, which has several variants for specific biomes as shown in some trailers.
* IFellForHours: The fastest way to get to the Underworld is to dig a two-block wide tunnel from the surface straight down. The result is a fall that takes nearly a minute to complete on the largest maps. Just make sure you have something to prevent fall damage or break your fall (water, liquid honey, Pink Slime Blocks) when you hit the bottom.
* ImmuneToFlinching: Knockback can be bothersome in battle as well as exploring (such as being hit into a tall chasm, taking fall damage). The player can equip the Cobalt Shield or its upgrade, the Obsidian Shield, which both completely prevent knockback. You can also use a grappling hook to latch yourself to any surface, though obviously moving is out of the question unless you let go.
* ImprobableAimingSkills: There are a number of enemies that have very accurate ranged attacks. As just a pre-hardmode example, Spiked Jungle Slimes and Hornets fire spikes and stingers with incredible accuracy, making a player's journey through the jungle difficult.
* ImprovisedArmor:
** You can wear an empty bucket as a helmet.
** You can also use a Fishbowl as a helmet, though [[TooDumbToLive you'll eventually drown if you don't take it off.]]
* ImprovisedWeapon:
** Hammers and axes are not intended as weapons for the most part, but higher end ones can still be effective. In previous versions, the The Staff of Regrowth, usually meant to be a tool for making grass grow quicker, was one, as it used to do more damage than the [[InfinityMinusOneSword Muramasa]], making it a very viable weapon to bash things to death with, and far easier to get if luck is on your side.
** Buckets of lava can be used in this manner by dumping them on enemies below you, as can columns of sand held up by a destructible block, or blocks of sand dropped from above. Sand in the Alpha did even more damage to things hit by it. There's a reason one of Terraria's title bars says "Sand is overpowered."
* InfantImmortality: The Angler is the only child in the game. He can be hurt by monsters or traps like the other townsfolk, but instead of dying bloodily like the others, he vanishes in a puff of smoke with the message [[ScrewThisImOuttaHere "[name] has left"]] when his health runs out. [[spoiler:Since this is how some phantasmal enemies like the Wraith "die," the most popular explanation is that [[DeadAllAlong he's a ghost]], so whether this is an aversion or not is unclear.]]
* InfinityMinusOneSword:
** The Blade of Grass is a fantastic replacement for just about any sword made from the common ores. It only takes a trip to the jungle (albeit a dangerous one for underequipped, new characters) and killing enough hornets for their stingers, as well as the naturally spawning jungle spores. [[hottip:*:[--Compared to the Light's Bane/Blood Butcherer which requires killing a boss to reliably acquire materials for construction, the Muramasa, which requires killing a boss AND looting a key to open a chest which contains one (while surviving the much more dangerous environment), and the Fiery Greatsword, which requires a Hellstone-capable pick and the ability to survive the inherent risks of a lava environment--].]]
** Pre-hardmode, the Starfury sword, which can be found randomly in the floating island chests. They hit hard for a low level sword and you can take out early bosses with relative ease thanks to its secondary attack, a falling star which drops approximately where your mouse cursor is. Used underground, it can also be used as an emergency light source, and the falling star can help reveal hidden passageways.
** In hardmode, the Mushroom Spear. You can buy it very early after defeating a mechanical boss, provided you make an suitable home for the Truffle [=NPC=]. It does decent damage, has good reach and knockback, and the mushrooms it makes can hurt monsters, even through walls. Aiming it can be tricky, but once you master how to use it, it'll last you for a very long time during the rest of the game.
* InformedEquipment: The game shows your character with whatever armor they have on, and there are also social slots now. If armor is put in these slots, that's what you see your character in, but gameplay-wise you are still wearing the non-social armour.
* InsectQueen:
** The Queen Bee. A giant bee boss that shoots out smaller bees which attack you until you kill them.
** An early-Hardmode weapon also lets you summon a Spider Queen, which in turn summons tiny spiders who wander about attacking any hostiles in range.
* InstantGravestone: Dying will spawn a tombstone stating your cause of death. You can then dig it up and change its message if you like.
* InstrumentOfMurder:
** The Magical Harp, a magic weapon which fires infinitely piercing notes that last for four seconds and move at a speed determined by the distance between the cursor and the player.
** The Axe, a guitar that serves as a hammer/axe combo and is the fastest hammer in the game (for axes, the Picksaw and Shroomite Digging Claw are faster).
* InterchangeableAntimatterKeys:
** Present and accounted for in the Dungeon. Dungeon Slimes and pots have a chance of dropping golden keys when killed/broken and keys may occasionally spawn in dungeon chests. The Golden keys can unlock Locked Golden Chests in the dungeon once expending the key.
** The rare dungeon chests use unique keys dropped by enemies in their respective biomes. The Frost Key for the Frost Chest found in the snow biome, for example. The keys open unique locked chests in the dungeon, and the keys are used up when the chest is opened.
* InterfaceScrew: The Blind and Blackout debuffs darken the screen. Getting a Brain Suckler latched onto your head reduces your vision to an absolute minimum around the character. The Confused debuff reverses controls.
* AnInteriorDesignerIsYou:
** A lot of furniture in the game is both functional as well as decorative. The large amount of furniture can either be made or found by the player and used to decorate their home. The made and found furniture have unique looks that lend to greater customization and decoration of your home.
** Housing using a wide variety of background and foreground materials can yield a variety of looks for the buildings.
** Various decorative banners can be found through out the game or dropped by enemies.
** Bosses have a chance to drop a trophy that can be displayed as both bragging right and decoration.
** Players have the option to paint their house and furniture in a variety of colours.
** As of the 1.2.4 update, you can craft and find furniture in the world made out of wood, Ebonwood (Corruption), Shadewood (Crimson), Pearlwood (Hallowed), Rich Mahogany Wood (Jungle), Boreal Wood (snow), Palm Wood (sand), Spooky Wood (Pumpkin Moon), Dynasty Wood (Traveling Merchant), slime blocks, flesh blocks, cogs (Steampunk), ice, sunplate blocks (Skyware), glass, lihzahrd bricks, honey blocks, living wood (made using normal wood), bone, mushrooms, obsidian, the respective dungeon colors, and golden furniture (dropped by pirates), not counting some misc things for decor like mannequins to display armor and outfits or lighting objects, or the more obscure things like living fire blocks, lavafall and waterfall blocks, and arcane rune walls. Certain areas, the Sky Islands, pyramids, dungeons, and Hell, all have uniquely themed banners to collect, and enemies rarely drop banners themed after themselves. Bosses drop wall mounted trophies to collect. Paintings and statues are scattered underground and in hell and the dungeon. You can capture wild critters and bugs and show them off in glass containers. The paint system contains a rather decent amount of variety. And 1.2.4 added weapon mount racks that you can place any weapon or tool on to show off. Phew. And who says building and decorating isn't fun?
* InUniverseGameClock: The game counts one second as one minute, and the day/night cycle is generally 24 minutes. You can keep track of time with various accessories or placeable clock furniture.
** There are also moon phases which are visible in the night sky.
** The day/night cycle is important for certain enemies, bosses, and in-game events.
* InventoryManagementPuzzle: You can only carry 41 items (51 for 1.2 PC) at a time (by using the trash as a slot), and those items are divided into stacks of varying size (250 for blocks [999 for certain items in 1.2 PC] and 99 for torches, just to name a couple). This means you have to manage your inventory carefully if you plan to go digging for treasure, and you'll have to backtrack often to unload items once you invariably run out of room. On the plus side, there are a great many chests scattered around the world, enough that you won't have to throw anything worthwhile away (and in the unlikely event you don't have enough, you can always craft more with some wood and iron). The vendors can also be used to offload some of the loot, while many players carry a piggy bank around with them to use as storage, bag of holding style. The much more expensive safe can add even more space.
* InvincibilityPowerUp: The mobile-exclusive Wiesnbräu, beer served in a glass boot, grants the Immune buff for 30 seconds and is the only item in the game that grants any degree of invicibility that lasts for more than a split second. However, it reduces the damage you can inflict and also gives you what is essentially a 90 second-long session of Potion Sickness.
* InvulnerableCivilians:
** Averted. At one point, there was a near-invincible civilian in the form of the Guide (who could still be killed by lava, but would quickly respawn), but an update changed this to allow him to die like the other [[NonPlayerCharacter NPCs]]. [=NPCs=] still can't be killed by the player under normal circumstances, although it is possible to with magma, and goodie bags dropped by enemies around Halloween commonly have Rotten Eggs, which can be used to damage and kill [=NPCs=].
** Killing the Guide by throwing his voodoo doll into a lava pit summons the Wall of Flesh.
** 1.2 adds the same potential fate for the Clothier, which lets you summon Skeletron again.
* ItemCrafting: The player can craft many different items from the various functional furniture pieces and personal workshops. Players can craft their own armor, weapons, ammo, special boss summoning items, furniture, and much more.
* ItsAWonderfulFailure: If a hardcore character dies, you return to the world where you died as a ghost. You then get to look around the world your character is leaving behind before you exit, at which point the character gets deleted and all the stuff dropped despawns when the world unloads.
* JetPack: For beginning players, the Rocket Boots can be purchased from the Goblin Tinkerer, and they can be combined with boots that let you run faster. Once a player is in hardmode and defeats a Mechanical Boss, the Steampunker moves in, allowing them to buy an actual Jetpack.
* JokeItem:
** The angel statues. The tooltip even says "It doesn't do anything."
** The Whoopie Cushion, which is very rare and produces a farting noise when used. The 1.2.0.3 update added an interesting use for this item as a crafting component.
** Then there's the confetti gun in 1.2, meant to celebrate being the 1000th item added to the game.
** There's a squirt-gun drop in 1.2.3 that does nothing but fire a harmless stream of water, as well as a beach ball that you can only push around to demonstrate some basic physics. 1.2.4 adds the junk items you can fish up, like lumps of seaweed, old shoes, and empty tins. As of 1.3 the Squirt Gun does have a small purpose--[[TheDevTeamThinksOfEverything it can trigger the "wet" buff for the Fishron Mount]].
** The Celebration, dropped from [[spoiler: the Moon Lord]] is usually seen as only a novelty weapon. It deals good damage and has large splash, but the 2 projectiles it fires travel a short distance before exploding like fireworks, and its fire rate is so-so. The Snowman Cannon is a ''much'' better rocket launcher weapon.
* TheJoyOfX: The Dao of Pow is the tao used as a flail.
* JumpScare:
** Explosive Blocks may cause this with their loud noise and the fact it's almost impossible to spot one. The worst part is that they are so infrequent you never actually expect them. 1.3, now spawns most of them connected to a ''very obvious'' PlungerDetonator, but there are still a few of the hard-to-see ones sitting around.
** The Dungeon Guardian does this to unsuspecting players: the door is unlocked, so the player can descend without defeating Skeletron. Go below 0 feet/meters and the Dungeon Guardian spawns and instakills anybody who isn't at max health and defense.
* JungleJapes: Available in both surface and subterranean variants.
* KilledOffForReal: If you die as a hardcore character, you don't respawn. Instead you can wander around as a ghost, and upon exiting the world, the character is deleted.
* KillerRabbit: Since they're entirely harmless, you might not even mind if bunnies hop right into your house. And then the Blood Moon rises, and they turn into terrifying Corrupt Bunnies, and ''they're already inside...''
* KillerYoYo: A new weapon type in 1.3, the yo-yo, is like a flail but you can control where it is with your mouse. They do less damage, but with mouse control you can string together hits for very high DPS. Their ease of control also allows you to swing them around corners and through gaps, attacking enemies with minimal risk to yourself. Yo-yos have several accessories that improve their tactical use, and there are plenty of upgraded versions like any other type of weapon.
* KillItWithFire:
** Pretty much everything you can craft out of Hellstone involves flames. The Molten Fury bow will cause wooden arrows to catch fire when you fire them.
** The Flamelash lets you cast fireballs.
** There are three seperate magic items that allow the player launch bounding fire balls that have a chance to set enemies on fire. The Flower of Fire, the Flower of Frost "burns with cold fire," and a Cursed Flame item.
** The game also has two flamethrowers permitting players to spray fire against their enemies. Crispy fun for the whole family!
** Flamethrower traps which can be used or tripped by the players.
** Certain ammos set enemies on fire.
** A crafting station exists that allows you to make 'Flasks' that add passive effects to you. You can mix up Flasks that let you add Fire and Cursed Fire to your attacks.
** Essentially what equipping the fire gauntlet is supposed to do, though it is more useful as an illumination asset.
* KingMook: The Eye of Cthulhu is a giant Demon Eye. The Eater of Worlds is a giant Devourer worm that can break into smaller segments. The King Slime is... well, you get the idea.
* KleptomaniacHero: You. See that room underground guarding that pretty gold chest? Go ahead, take what's inside. Better yet, take the entire chest. Even better, ''take the entire room''. You can uproot nearly everything (with the notable exception of Demon Altars; you can destroy them, but not take them) with the right tools.
* KnifeNut: Throwing Knives are a pretty reliable weapon early in the game. Their more powerful magic counterpart has unlimited ammunition (but consumes mana). 1.2 has the even-more-powerful Vampire Knives which restores health points from dealing damage.
** 1.3 gave NPCs weapons to defend themselves against enemies. The Merchant uses Throwing Knives, and the Angler has Frost Daggerfish.
** There's also the Psycho mob from the Solar Eclipse event, confirmed by the devs to be a reference to ''Franchise/{{Halloween}}''. He uses a knife to attack and drops the [[http://terraria.gamepedia.com/Psycho_Knife Psycho Knife]], which stealths you when wielded and gives a massive damage boost in the process.
* KnockBack: Core mechanic. Preventable with a shield item, if you can find it. [[LedgeBats Problematic]] without it.
* TheKrampus: Krampus is an enemy during the Frost Moon event.
* LaserBlade:
** The Phaseblade is unabashedly a [[StarWars lightsaber]], complete with the classic "vwomm" sound effect. Happily, the gems you use in its construction affect the color of the blade, allowing for white, red, yellow, blue, green, and [[Creator/SamuelLJackson purple]] Phaseblades.
** Through Crafting the Phaseblade with Crystal Shards, you can make the Phasesaber (41 base attack and Light Knockback).
* LavaAddsAwesome: Make obsidian! Mine hellstone! Slaughter your enemies! Suffer a messy, fiery death! A thousand and one uses!
* LavaIsBoilingKoolAid: This game somewhat mimics ''Minecraft'', in that the Lava's not instantly fatal and flows a bit slower than water. However, it only destroys loose blocks and common items...which leads to the FridgeLogic-inducing sight of a stone block beside a lava pool you just mined...one holding the lava in place, mind you...is destroyed by that very same lava.
* LavaPit: Found in deep depths. Also made by players in order to create a barrier or trap for enemies; shallow ones are just as effective and if shallow enough, the coins and items dropped by the enemies will not get burned up.
* LedgeBats: A reality due to knockback, unless you have a Shield-class accessory equipped.
* LesserOfTwoEvils / NecessaryEvil: Spreading the Hallow, in most cases. The Hallow isn't exactly friendly, but [[NonPlayerCharacter NPC]]s can live in the Hallow and it won't encroach upon the Jungle. In desperate situations, spreading it may be the best way to deal with a particularly bad Corruption/Crimson spread.
* LethalJokeItem: Quite a number of weapons manage to be very effective while being fun and silly:
** Of particular note are the Party Bullets, which are crafted by buying empty casings from the Arms Dealer and Confetti from the Party Girl and then combining them, and the Bananarangs, one of the strongest Boomerang-class weapons.
** There is also the KO Cannon, which is a cartoonish boxing-glove cannon that behaves like the Harpoon.
** The Party Girl's ''fireworks'' are mostly there to look pretty, but their explosions can wound and kill monsters.
** The best pickaxe pre-hardmode is the Reaver Shark. Yes, a shark with a pickaxe head. There's also the Chainsaw Shark, which is a shark with chainsaw teeth.
** Apart from that, players can find and ''use'' a Swordfish (or Obsidian Swordfish) as a spearlike weapon! The Obsidian Swordfish is even the second-strongest Spear in the game in terms of raw attack power.
** The Meowmere is a sword that has a hilt depicting a cat's face, and fires rainbow-trailing cats when swung. It also has the highest base damage of any sword in the game.
* LethalLavaLand: The absolute bottom of the map is the Underworld, a hellscape with massive pits of lava, ash blocks as the only non-structure block, and Hellstone ore which produces more lava when mined and will damage you if touched without protection by obsidian equipment/potions. It's also filled with angry demons, flaming bats, fiery wizards, and skeletal serpents which will make your life hell. And that's before you summon the boss.
* LifeDrain:
** 1.3 introduces a magic weapon dropped by Crimson Mimics that's actually called this, it increases life regeneration rate as it damage enemies within its radius.
** The Vampire Knives have this effect when they hit enemies, while the Spectre Armor (Hood) SetBonus allows you to deal this to enemies hit with spells.
* LightIsNotGood: In fact, it is almost as nasty as the dark. God, those pixies hurt! On the other hand, it may still be preferable, because Hallow enemies are still slightly less annoying than Hardmode Corruption/Crimson. And unlike its darker counterparts, Hallowed areas are livable for your villagers.
* LightningBruiser: While there are quite a number of bosses that fit this, Duke Fishron is the best example. He's extremely painful, fast and mobile (even moreso when he TurnsRed), and he sports the second-highest health of all bosses while being a single target (Destroyer has more, but multiple segments can be hit at once to score multiplied damage).
* LiterallyShatteredLives: The TakenForGranite debuff increases fall damage, making this a likely result if you get hit with it in midair.
* LivingStructureMonster: The Wall of Flesh is ExactlyWhatItSaysOnTheTin - a massive, moving wall with eyes and a mouth.
* LoadingScreen: The game does this during world generation to include items to let you know which part of the generation process it's on like "Putting dirt in the rocks" which are dirt patches deep underground and "Putting rocks in the dirt" which are stone patches underground or on the surface. Notably, you can tell if the world will have Corruption with "Making the world evil" or Crimson with "Making the world bloody".
* LogicalWeakness: The Stake Launcher, which is already a powerful endgame ranged weapon in its own right, deals an absolutely ridiculous amount of bonus damage to Vampires. It can easily hit them for over 5,000 damage, when the maximum health for a Vampire is 500.
* LordBritishPostulate:
** This used to exist in full force with the Guide. A common hobby of people was bringing lava to him and trapping him in a pit with the stuff, watching him burn to death. Now, however, he's just as mortal as the other [=NPCs=], especially if you have a Guide Voodoo Doll, which lets you attack and kill him. It even [[TheDevTeamThinksOfEverything kills him if destroyed by other means.]] And doing so summons a boss. As of the Big 1.2 Update and the subsequent supplemental patches, the Clothier has his own VoodooDoll now. Equipping it allows you to attack him directly; slaying him with it equipped will allow you to summon Skeletron. The Clothier even drops a special hat when killed, as if players weren't murdering [=NPCs=] enough already. The other [=NPCs=] can't be harmed by the player directly without the Rotten Eggs from Halloween, but they can be killed by monsters or lava.
** Also, the supposed-to-be-undefeatable Dungeon Guardian has been killed many, many times. In 1.2, he now drops the Bone Key, which summons the Baby Skeletron Head pet.
** Skeletron Prime has been killed after sunrise, although it's more boring than anything since he only takes ScratchDamage and instakills you if he touches you.
* LostForever:
** Many items used to be severely limited--notably, loot from floating island and dungeon chests. The 1.3 update added several varieties of loot crates, obtained by fishing in the associated biome, [[AvertedTrope specifically to avert this]].
** Items exclusive to chests still apply, especially the rarer ones. Lava Charms in particular can be difficult to find.
** Worldgen might be cruel and leave you with a Jungle with only a single Beehive, or even make you a world without giant Living Trees. As for the Giant Pyramids, small worlds have a ''very'' high chance of generating without a single pyramid to raid. Even if one is generated, the single chest within will never contain the full range of loot.
** The Spider Banner drops from Wall Creepers for every 50 kills. Once you enter hardmode, Wall Creepers are completely replaced by Black Recluses, who have their own banner, which means you can't get one if you didn't get it prior to hardmode.
* LovecraftLite: The game is a nice, happy, 2d ''Minecraft''-like game. Also like ''Minecraft'', it has some pretty warped and grotesque enemies, especially the bosses. A lot of the enemies from The Corruption look like animated clumps of rotten flesh, and then you get to the Eater of Worlds. However, it gets ramped up further when you attempt to activate Hardmode. By making a HumanSacrifice [[YouMonster by throwing a Guide Voodoo Doll into lava]], you summon the Wall of Flesh, an enormous AdvancingWallOfBoss that is comprised of unidentifiable fleshy matter, with lots of miniature creatures attatched to it that try to eat you. The sheer sight of this thing inflicts a [[GoMadFromTheRevelation temporary case of magically induced terror that literally reads "You have seen something nasty, there is no escape."]] But all of the above are killable, and they could be a lot more horrifying looking than they are. [[SugarBowl Not to mention the cutesy look of everything else.]]
* LuckBasedMission: Hardcore mode + virtually invisible one-shot-kill explosive traps = this. It's less an issue of ''if'' you'll step on one and die and more ''when''. Mercifully, an update made these traps significantly more visible, though you can still fall victim to one if you jump down into unexplored caverns.
* LudicrousGibs:
** Nearly every living thing explodes into pieces when it's killed, although if the blood and gore setting is turned off, gibs are turned into puffs of smoke.
** Due to being MadeOfPlasticine (see below), blood moons and goblin invasions usually end with bloody chunks scattered all over the place.
** The Moon events have unrelenting waves of mobs that come after the player. Those capable of reaching the last wave usually have weapons, buffs, and specially set up arenas designed to cause this.
* MacrossMissileMassacre:
** Spamming the Scourge of the Corruptor all around you will result in a screen full of tiny homing corruptors homing in onto any unfortunate enemy in the area.
** Spamming the Razorblade Typhoon tends to have a similar effect as the projectiles last for a good bit of time.
** The Martian Saucer boss can do this, with actual missiles.
* MadeOfPlasticine: Whenever any enemy, [=NPC=], or player dies, all will always explode into a pile of bloody chunks. Some creatures, like rabbits, tend to be strewn rather liberally across the landscape. Gibs go flying further when you're using weapons with immense knockback.
* MagicCarpet: Magic carpets can be found in pyramids. They allow you to fly a considerable distance horizontally, making them useful for mobility early on.
* MagicMeteor:
** Every night Fallen Stars will crash down like meteors in random places. If you're lucky, they can hit enemies while falling and do 999 damage to anything, including bosses that you can fight outdoors. You can collect them for various uses. They can be crafted into an item that will permanently increase your maximum {{Mana}} pool up to a certain point (which is the only way to get a Mana pool in the first place). You can stuff one in a bottle to create a lantern that increases mana regeneration. You can craft them into furniture with a special crafting station. Finally, they can be used as ammunition for a special type of gun, and do the most damage of any type of ammunition in the game.
** Actual meteors have 50% chance of falling offscreen after the next midnight whenever you destroy a Shadow Orb/Crimson Heart and 2% chance of appearing every midnight afterwards, so long as the amount of unmined meteorite in the world is below a certain threshold. Any location that has at least 50 meteorite blocks in close proximity spawns Meteor Heads endlessly. The resulting meteor ore can be crafted into various items, including the aforementioned star-shooting gun and a rapidly-firing [[FrickinLaserBeams laser pistol]] which gains infinite ammo with a [[SetBonus full set of meteor armor]].
* MagicPoints: You start off with no mana and must collect falling stars in order to forge crystal stars which let you increase your mana meter. 1.2 for PC grants all new characters one star of mana straight away.
* {{Magitek}}: The Space Gun and Rocket Boots. Some other exotic weapons also consume mana when used.
* ManaMeter: The game requires you to gather 10 fallen stars[[note]]5 as of 1.2, and 3 as of 1.3[[/note]] to craft into a mana crystal which expands it by 20 points. A player can also expand it by equipping accessories and armor which can expand it until taken off, such as bands of star power, accessories with the "Arcane" prefix, jungle armor, or the helmets made from Hardmode ores.
* ManaPotion: Four different levels of Mana Potion, each restoring increasing amounts of Mana. While you can guzzle them all day (and automatically so with the Mana Flower), drinking one imposes the Mana Sickness debuff, temporarily reducing your magic damage output.
* MarathonBoss:
** The Goblin Army invasions can feel like this at higher levels. Spending an entire in-game day killing 150 (or more, depending on how many players are in your server; the maximum is potentially ''over 10,000'') Goblins of varying types comes off as more of a nuisance than an OhCrap moment when they barely do much damage, even more so if your house is rather large, which can end up confusing the goblins since they try to target you first.
** Before 1.2, The Twins and Skeletron Prime could feel like this for strict melee-oriented players. Due to those two bosses having high dodging tendencies, the best ranged melee weapons usually included a full stack of Light Discs. Even then, using the then unpatched fire block immunity exploit only let players survive long enough to wear down the boss' health to zero, which could take all night from 7:30pm onwards, faster with the appropriate buffs. Fast forward to 1.2.2, those two bosses have gotten a damage and hit point nerf, while melee characters can acquire the North Pole. The result is, if properly set up, the destruction of The Twins and Skeletron Prime within a minute in what must be some sort of hilarious comeuppance, putting them (or most bosses for that matter) in undeniable farm status.
* MeaningfulName: Retinazer is an [[MagicalEye eye]] that shoots [[EyeBeams lazers]]. Skeletron Prime is a [[{{Transformers}} robot]] version of Skeletron. The Minishark is a shark-shaped minigun. And that's just the tip of the iceberg.
* MeatMoss: The [[ExactlyWhatItSaysOnTheTin Wall of Flesh]], a powerful end-game boss. The 1.2 update introduced the Crimson, a variant on the Corruption that replaces the dark-themed monsters with flesh-and-blood themed ones such as the Blood Crawler and the Face Monster.
* MenuTimeLockout:
** Played straight and averted it depending on if autopause is turned on or off.
** Having it off can have its advantages as you can click an item and then place/use/swing it by clicking, making the {{An Interior Designer Is You}} part much easier.
** Having it turned on can also have the advantage of being able to pause in a dangerous spot/during a blood moon. It also leads to one of the most potent bugs in the game, ''allowing you to bypass potion cooldown''.
* MercyInvincibility: You get this for about half a second after being hit, and a new accessory in 1.1 makes the duration of this a little longer. This particular game mechanic is frequently exploited to allow players to keep taking trivial damage from minor hazards as a means to completely avoid deadly boss attacks.
** This is played with for monsters -- due to how piercing weapons work, attacking an enemy with piercing projectiles will prevent them from taking any other piercing damage for a brief moment, meaning {{Multishot}} ranged weapons work better with single-impact ammunition.
** The Cross Necklace, a drop from [[ChestMonster mimics]] in hardmode, will slightly extend your MercyInvincibility, which can still be a big help against bosses that can hit you rapidly like the Destroyer or Duke Fishron.
* MetalSlime:
** "Pinky" is a [[ExactlyWhatItSaysOnTheTin bright pink]] slime that randomly spawns during the day. It has ten times the HP of the basic Green Slime (150 vs. 14), is smaller, and suffers double from knockback (hit it with an axe and watch it fly), but is otherwise the same but drops gold coins when killed. (To put that in perspective: 100 copper coins make one silver coin; 100 silver coins make one gold. Green slimes drop about 20-50 copper coins. Pinky drops the equivalent of 10,000 copper coins.) It is the only above-ground slime that is "aggressive" by default. As soon as you see one, it ''will'' come after you.
** Rainbow Slimes only spawn in the Hallow during rain, and are extremely rare even then. They drop the Rainbow Bricks.
** Mimics are another example; they spawn randomly and fairly rarely in Hardmode, and drop up to ten gold coins and one of several items.
* {{Metroidvania}}: Exploration in the game is an important part of the game, you can find several valuable upgrades by spelunking underground as well as find rare ores and unique areas.
* MidAirBobbing: The Money Trough floats this way when summoned.
* MinecartMadness: Players can place minecart tracks to ride minecarts on. Tracks can also randomly generate underground; you can dig up these tracks and use them yourself if you don't want to hunt for more Iron or farm more Trees to build your own.
** [[https://youtu.be/uR-JyqmgcyY Here's a video]] showcasing ''true'' Minecart Madness. This world-tour round-trip rollercoaster took 20+ hours to build and spans the entire game world, including many Underground areas.
* TheMinionMaster: A possible equipment setup with the 1.2 update, which introduces two types of minions (spear-chucking Pygmies and Baby Slimes) and an armor set and accessory that let you summon up to 6 at once. The Big 1.2.4 Update adds Spider-themed and Bee-themed Summoner Armor sets, and adds more summon creatures. The 1.3 update has made Summoner into an actual fourth class, introducing new armors for summoners as well as a Summoner Emblem.
* MobileFishbowl: The Fish Bowl item will cause the player character to drown if it's worn outside of the vanity slot. If the player drinks a Gill Potion or uses a Breathing Reed while wearing the Fish Bowl item, though, he or she will be able to breathe normally.
* MolotovCocktail: With some Torches, Ale, and Silk, you can make these in a pinch.
* MoneySpider: Almost all enemies drop coins (among other things) when killed.
* MonsterClown: Unlocking Hardmode causes Clown monsters to appear during Blood Moons. Silly-looking as they are, they're also fairly tough, and they throw bombs that destroy blocks and can mess up any buildings you've made.
** Fortunately, as of version 1.2, clowns won't blow up your painstakingly crafted base/village/what have you. They still do quite a bit of damage, though.
* MonsterMash: During a Solar Eclipse, you face off against Reapers, Swamp Things, Frankenstein's Monsters, Vampires, and Cyclops Zombies on the surface. Pity there are no werewolves or skeletons, as they can only appear at night or underground respectively.
** In the 1.3 update, various monsters based on horror monsters now appear, such as [[Franchise/{{Halloween}} Psycho]], [[Film/CreatureFromTheBlackLagoon Creature From the Deep]], [[Franchise/TheTexasChainsawMassacre Butcher]], [[Film/TheFly1958 Dr. ManFly]], [[Franchise/{{Godzilla}} Mothron]], [[Film/TheExorcist The Possessed]], [[Franchise/{{Hellraiser}} Nailhead]], [[Film/{{Phantasm}} Deadly Spheres]], and [[Literature/{{Frankenstein}} Fritz]].
* MonstersEverywhere: The Goblin invasion formula to determine how many will attack? 100 + (50*number of players with more than 200 health). For a single player over 200 HP, that's 150 goblins ranging from merely annoying to tough, with the max of 255 players in a server, there can be 12,850 goblins in an army.
* MookMaker:
** Some statues when powered will spawn monsters though the monsters spawned from statues do not drop rare items or coins. For example, slimes still drop their regular gel but no money, and the Mimic will not drop its highly useful rare drops at all.
** Various bosses spawn smaller enemies to harass the player.
* MoreDakka:
** The Minishark, which upgrades into the equally rapid-firing [[PurposelyOverpowered Star Cannon or Megashark]].
** Pirate Captains have a machinegun that they turn on the player.
** Players have access to a few automatic or rapid fire guns including an uzi, a chaingun, and a Gatligator.
* MultiMookMelee: Various events in the game like Blood Moons, Solar Eclipses, or any one of the invasions feature swarms of mooks of varying types attacking the player. However, the mooks do not steadily become more difficult - they simply keep attacking until a set in-game time or sufficient numbers of the enemy have been killed.
* {{Multishot}}: Some bows shoot multiple arrows for the cost of one: Tsunami fires 5, Phantasm and Daedalus Stormbow fire 4, and Chlorophyte Shotbow fires 3.
* MundaneUtility:
** Magic Missile is useful for many, ''many'' things. For starters, the missile tracks your cursor and lasts as long as you hold the mouse button down, making it easy to hit agile mooks. The missile is decently powerful, can slip through small spaces that you might not be able to attack through, generates quite a lot of light, and doesn't expire when cutting through plants. Jungle thorns blocking your way at an inconvenient angle? Trim them with a magic missile! Flamelash is the same but brighter and more powerful, and update 1.1 introduces the Rainbow Rod, which is even stronger and all rainbow-y.
** Any item that emits light particles will be used as a light source. Some people keep items like Gungnir not only as a fast, hard-hitting, long-reaching sacred spear but also as a means to see through walls. Starfury makes glowing stars drop from the sky towards wherever you click; if you're underground, it's a great way to detect nearby caverns.
** With the 1.2 update, the Death Sickle passes through blocks while emitting a faint glow. Equipping accessories that grant burning effects causes the spectral sickle to glow even brighter. Very useful when trying to spot holes and goodies or even when digging up ores.
** Phaseblades and Phasesabers as well as any weapon on fire such as the Firey Greatsword or Molten Hamaxe can be used to light up dark caves while exploring. Combined with the Mithril armor which shines for several seconds AFTER a light source is cast on it lets you ditch the otherwise necessary illumination tools while mining.
** The sparks of light thrown from several weapons when swung or thrown, like the Magic Boomerang and the Hellstone weapons, are very useful for spotting things through cavern walls as you can throw them through the otherwise-solid blocks and see what's on the other side. Similarly, setting enemies on fire will cause sparks to drop from them, which illuminate further down than you can normally do. Light an enemy on fire and look under them as the sparks reveal the area.
** Flares are not only mundanely useful for lighting up distant areas, but they can light enemies on fire. Not only does this have the effects listed above, but you can see enemies that retreat into the dark. The damage caused by fire is pretty low so it doesn't really work as a damage source by the time you would end up finding it.
** The Solar Eruption. It's a flail with a good range, lights up a large area and passes through walls allowing it to light up a considerable area. As an added bonus, it's one of the most damaging melee weapons in the game, only falling shy of the Moon Lord's drops.
* MushroomMan: If you create an above-ground "mushroom" biome, it will occasionally spawn mushroom zombies, and if you build a house in the biome, then activate hardmode, the house will eventually become occupied by the Truffle, a mushroom-man NPC.
* MuzzleFlashlight: While trying it with guns would probably [[CaptainObvious not be efficient]], it's very possible to pull this off with certain magic spells or glowing weapons. See MundaneUtility.
* NamesToRunAwayFromReallyFast: The Wall of Flesh, the Eater of Worlds, the Destroyer... most of the bosses have this going for them really.
* NameTron: Skeletron, though it's not actually mechanical. Skeletron Prime, on the other hand, is a definite example.
* {{Nerf}}: Several pieces of equipment and bosses have been made less hardcore at points:
** The Rod of Discord's TeleportSpam was made less absurd by adding a Teleportation Sickness debuff that prevents you from spamming it constantly.
** The Spectre Armor's lifesteal set was made less powerful by giving it a damage penalty while you used that specific armor set bonus.
** The Molotov Cocktail now requires Pink Gel to make and its damage has been scaled back a little, making it less overpowering in the early game.
** Both of the vortex weapons have been nerfed with the Phantasm having its damage reduced from 70 to 50 and the the Vortex Beater from 63 to 50 (1.3.4).
* NewGamePlus: Not the traditional sense, as when you start a new world map you take along any items in your inventory if you choose to play with the same character. The piggy bank and safe items both create a storage space that is linked in all the worlds and tied specifically to your character, making it handy for transferring materials rapidly between worlds.
* NiceJobBreakingItHero: Congratulations on making it to the Underworld and slaying the abomination that dwells there! You're told that "The ancient spirits of light and dark have been released." What does that mean? A variety of much tougher enemies all over the world, and The Corruption spreads much more aggressively. On the plus side, there's now an anti-Corruption biome full of rainbows and unicorns. [[LightIsNotGood Which are trying to kill you]].
* NightmareFace: There's a reason why the [[http://terraria.gamepedia.com/Face_Monster Face Monster]] is named that way. Doesn't help that it's found in one of the creepiest biomes in the game.
* NintendoHard: Maybe not in general, but try playing the combination of an Expert Mode world and a Hardcore character. Good luck with the boss fights.
* NocturnalMooks:
** Several enemies only show up during the night. In addition, several bosses (the [[EyeScream Eye of Cthulhu]], [[DemBones Skeletron]], and the mechanical bosses) can only be summoned at night.
** [[InvertedTrope Inverted]], however, with aboveground slimes, who will no longer spawn at dusk.
** Subverted with solar eclipse only enemies.
* NoFairCheating: In all versions before 1.3, anyone who tries to wear the unique Devteam equips will find themselves set upon by debuffs and eventually get killed by said debuffs.
* NoHeroDiscount: Averted if you have the Discount Card, a rare drop from the pirates. Otherwise played straight. Just saved your [=NPCs=] from a blood moon attack? Rescued them from the dungeon? Great, except they still charge you full price for their wares.
* NonCombatantImmunity: PVP mode. Both you and the other person need to be in PVP mode to kill each other.
* NoOntologicalInertia:
** Inverted. It's possible to remove biomes by digging up/destroying enough of them, causing the local monsters not to spawn.
** Another inversion: Santa Claus only lasts from mid-December to New Year's. Once the Christmas season is over, he is instantly and inexplicably slain.
* NoPeriodsPeriod: Averted. Most female [=NPCs=] are more irritable during the Blood Moon event.
* NothingIsScarier: After defeating the second-to-last group of bosses in the game the message "Impending doom approaches" appears on screen, and everything starts going dark. All remaining monsters flee, and the music, which in Terraria never stops even in the creepiest of occasions, grinds to a halt, leaving you with an almost completely black, empty, silent screen. This goes on for about a minute until [[spoiler: [[EldritchAbomination the]] [[FinalBoss Moon]] [[HPLovecraft Lord]] appears]].
* NotTheFallThatKillsYou:
** You can stop fall damage with certain accessories (Lucky Horseshoe, Obsidian Horseshoe, and any Wings), using a grappling hook to hook onto a wall before you land, using the Rocket Boots to slow your fall, double-jumping before landing, or [[SoftWater landing in water]] or cobwebs. If you ''do'' take fall damage, it can be [[DisneyVillainDeath severe]].
** Oddly, if you time it right you can grapple onto the ground and [[ArtisticLicensePhysics pull yourself down faster to negate the lethal falling damage]].
* NumericalHard: One aspect of Expert Mode, where enemies will have 2x the health and deal 2x the damage.
* ObviousRulePatch:
** Mimics spawned from Chest Statues don't drop anything. Since Mimics drop up to ten gold coins and several useful late-game accessories and weapons, being able to quickly and easily farm them would be a massive GameBreaker.
** Similarly, Corrupt Bunnies generated from Bunny Statues during Blood Moons no longer drop any money as of version 1.2.
** In a similar fashion, Meteor Heads stop dropping ''anything'' once you enter Hardmode, so as to prevent players from creating artificial meteor head Biome Farms to farm Souls and Biome Key Molds.
** The [[TeleportSpam Rod of Discord]] was such a massive GameBreaker (being able to teleport spam at no cost) that the 1.2.1.2 update changed it so that attempting to teleport spam made the user CastFromHitPoints. You can still use it to explore or in an emergency, but not at the same rate as before.
** The ability to stack positive damage affixes to large degrees made any life-steal setup almost devoid of risk to the player during confrontations where the player would easily out-heal hard-hitting attacks like chugging down Greater Healing Potions non-stop. The 1.2.2 update capped the rate of life-stealing to about 2 hearts per second, making less feasible a maximum damage setup Vampire Knives user from just sitting in the hit box of a boss monster mincing its insides while maintaining a full health bar.
** [[spoiler:The Moon Lord]] boss is very big and hits very hard, but is also one of the slower bosses, and it only disappears if all players are dead. When it was introduced, players fighting [[spoiler:the Moon Lord]] alone could lure it far away and then teleport back home if they were in danger, where they were safe to heal up while the boss took its sweet time chasing the player. Come patch 1.3.0.4, [[spoiler:the Moon Lord]] will teleport directly to the player if they are far away, possibly killing the player if they were already at low health.
** Furthermore, many players were abusing the MercyInvincibility from spikes to prevent themselves from taking damage from [[spoiler:the Moon Lord]]. Come 1.3.0.6, and [[spoiler:the Moon Lord's]] attacks use their own cooldown for immunity, making it such that it's no longer possible to abuse MercyInvincibility against it.
* {{Oculothorax}}: Small, medium, and large: Servants of Cthulhu, Demon/Wandering Eyes, and the Eye of Cthulhu.
* OdangoHair: CharacterCustomization options involves two Odango hairstyles (one of them being [[Franchise/StarWars Princess Leia]]'s), as of the 1.3 update the Stylist can also give your character a hairstyle like [[Anime/SailorMoon Chibiusa's]] (thought interestingly not Usagi's hairstyle) for a total of 3.
* OhCrap:
** Newbies with low maximum health might think this when they misjudge a jump over a long fall down in the Underground or the Caverns. They WILL definitely think it if they trip a boulder trap while hurting.
** The Eclipse and Blood Moon event notices or invasion warnings can trigger this response depending on the players situation.
** Many of the hardmode BossWarningSiren messages when bosses spawn naturally cause players to experience a brief moment of dread.
** Players unexpectedly finding themselves facing multiple hardmode bosses at once due to a glitch, natural spawn occuring after a boss is summoned, or in general being surprised by a boss while fighting another boss.
* OneHitKill:
** Besides being crushed by the Wall of Flesh or running out of time against Skeletron, Explosive blocks are this. Explosive blocks deal 250 base damage, but all damage dealt from other players or to oneself (which includes explosions) is doubled, resulting in a whopping 500 damage. The maximum HP a player can have is 400, and the best protective gear and buffs can prevent at most 40-50 damage, meaning that a trip mine will instantly kill anyone within range. ''[[ParanoiaFuel Trip mines are randomly scattered underground]]''. In 1.2 for PC, this has been nerfed such that you take full damage without the previous PvP multiplier, and you can ensure your survival by boosting your life to 500 using life fruits. In 1.3, these are now triggered by an ''{{incredibly obvious|Bomb}}'' PlungerDetonator, making them much easier to avoid.
** Trying to enter the dungeon before killing Skeletron will cause the Dungeon Guardian to appear who does over 1000 damage.
** In Expert Mode in version 1.3, some Hardmode enemies/bosses can inflict more than 600 damage through armor. Don't get hit by them now.
* OneHitPolykill: Most of the best weapons and ammo are capable of piercing through multiple targets.
* OpenEndedBossBattle: The Eater of Worlds/Brain of Cthulhu, while not technically skippable, don't actually need to be defeated. You only have to defeat enough of their component parts to collect the items you need to forge a better pickaxe, at which point you can die (on anything other than Hardcore) without having to worry about finishing the job.
* OrdinaryDrowningSkills:
** Initially, your character sinks like a rock in water and will drown if you can't reach air. Special items like Flippers and the Breathing Reed turn you into a snorkel diver instead of a drowning rock, while the Diving Helmet significantly increases your air capacity. Neptune's Shell turns your character into an aquatic creature when equipped and in water, allowing you to remain underwater indefinitely, move underwater at the same speed as on land, and incorporating the effect of the flippers.
** In 1.2, your character suffocates when trapped in sand, silt or slush. There's a debuff instead of an OxygenMeter, and you lose health really, really quickly.
* OrganDrops: Slimes drop slime gel, Soul Eaters drop rotten chunks of meat and Demon Eyes drop [[http://en.wikipedia.org/wiki/Lens_(anatomy) lenses]]. Enemies in the Crimson drop Vertebrae. The Brain of Cthulhu (and its minions) drop Tissue Samples. Hornets drop their stingers, Angry Bones drop bone fragments, and the Man-Eater plants in the Underground Jungle drop vines.
* {{Orichalcum}}: The game features Orichalcum as an alternative to [[{{Mithril}} Mythril]]. Its appearance is pink and a full set of its armor with any of the helmets causes pink petals to strike an enemy you hit.
* OurDragonsAreDifferent: In the form of the Wyvern, a long, slender white dragon that roams the higher parts of the map while in Hardmode.
* OurGoblinsAreDifferent:
** Every once in a while you'll be warned that a Goblin Army is approaching. You'd be forgiven for dismissing this message as a non-threat, but in fact Goblins can be a serious threat to your life, your [=NPC=] inhabitants, and your clicking finger. Unless, of course, you have advanced equipment and increased max life. Or if you've built your base a ways to the east or west, or high into the sky, since Goblin Armies only attack near a map's central spawn point.
** As said by the Goblin Tinkerer, they're quick to anger, and would even start a war over a simple goblin flag.
* OurWerewolvesAreDifferent:
** During a full moon, countless werewolves appear out of nowhere, despite being on an island with few humans.
** The player can also wear Moon Charm, which turns him/her into a werewolf during night.
* OurWormholesAreDifferent: The [[EldritchAbomination Vortex Pillar]] is able to spawn wormholes near the player that produce Alien Hornets. One of the [[FlunkyBoss mooks that accompany it]] can create a wormhole that summons a lightning bolt.
* OvershadowedByAwesome: Rangers and summoners in the current late- to endgame. Rangers can dish out great DPS via the Megashark or Uzi, can tackle groups with the Stynger or Rocket Launcher, and can deal over 1000 damage in a single crit with the Sniper Rifle. Even with all that, they remain [[GlassCannon Glass Cannons]] while Vampire Knives and Spectre Armor turn Warriors and Sorcerers into effective [[PhysicalGod Physical Gods]]. No longer this in 1.3, as [[spoiler:the Moon Lord]] absolutely ''wrecks'' any LifeDrain strategy by inflicting a debuff that prevents any life drain from occuring and reapplies it frequently.
** Currently, mages and to a lesser extent rangers seem to overshadow the rest after the new weapons were introduced. Mages can deal crazy amounts of damage via the Last Prism and Lunar Flare and their Nebula Armor gives damage, health and mana regen buffs to themselves and ''all nearby teammates'', Rangers have the SDMG and Phantasm to deal heavy DPS when stealthed while still being {{Glass Cannon}}s, while Melee and Summoners can't deal as much DPS as the two.
* OxygenMeter:
** Clearly visible in the game and health begins to drain after you run out of air. It is possible to keep yourself alive with health items and having a large health meter for lengthy periods of time.
** Diving gear and breathing reeds greatly retards the rate of oxygen depletion, while the charms that grant you transformation into merfolk eliminate the bar entirely.
** The [[ArtificialGill Gills Potion]] allows you to breath underwater. The Obsidian Skin potion also allows you to breath under''lava'' (along with its lava immunity effect) as of 1.2
** Wearing the Lava Charm or the Lava Waders gives you a different type of "oxygen" that allows you to be submerged in lava for up to 7 seconds before you start to take damage from it. Both of those accessories can be worn together to extend that time to 14 seconds.
* PaletteSwap:
** There are seven different versions of the basic Slime monster.
** There's also two versions of the basic Skeleton monster, two of the Skeleton caster, two of the Bat, two of the Man eater (a jungle-based killer plant), and many of the Zombie.
** In 1.2, Lead, Tin, Tungsten, Platinum, Palladium, Orichalcum and Titanium are practically alternate (and slightly better) materials of Iron, Copper, Silver, Gold, Cobalt, Mythril and Adamantite repectively, that can be generated in a world in the place of the latter materials. The weapons, bricks and furnishings made from them are appropriately different-colored as well, while the 'alternate' Hardmode Metal armor suits have unique properties that the Cobalt, Mythril, and Adamantite armor suits lack.
** Wood can be found in different forms depending on the biome, including Shadewood (Crimson), Ebonwood (Corruption), Pearlwood (Hallow), Boreal (Snow), Palm (Beach/Sand), and Rich Mahogany (Jungle).
** Most of the console-exclusive content, including enemies and equipment, were reskinned or recolored versions of existing content. The 1.2 patch to console Terraria changed this, giving the content in question actual unique graphics.
** Gemstones all originally had the same elliptical shape while changing only in color before 1.2 update gave them all different cuts.
* PatchworkMap: Played perfectly straight: the biomes are randomly generated and divided from one another by an invisible line.
* PersonalSpaceInvader: Brain Sucklers at the Nebula Pillar will [[FaceHugger latch onto your character's head]], dealing damage as well as [[InterfaceScrew reducing vision to an absolute minimum]] until removed.
* PhysicalHell: You can actually enter Hell (called the Underworld ingame) simply by digging down deep enough. In there you'll find demons, a wall of flesh, and [[ArsonMurderAndJaywalking bats]]. There's [[FireAndBrimstoneHell lava, fire]], imps, lava slimes, hellbats, [[DepartmentOfRedundancyDepartment lava, fire, and lava.]] [[CaptainObvious It's dangerous down there.]]
** Yet ironically much safer than the overworld once Hard Mode kicks in as [[NiceJobBreakingItHero unspeakable horrors once sealed in the form of the Wall of Flesh are released]].
* PiggyBank: Piggy banks are a personal "container" item, allowing your character additional space for storing all sorts of items (not just coins). They also protect any coins stored from the coin loss penalty for death, while still allowing you to spend them.
* PiranhaProblem:
** Piranhas frequently show up in bodies of water.
** Subverted for the player with The Piranha Gun. It fires a mechanical Piranha that latches onto and chews enemies for continuous damage as long as the trigger is held. The initial shot is straight line of sight attack. However when the projectile Piranha kills an enemy it will immediately launch after the next nearest enemy. It will continue to do this for some time until it can't find any more enemies, the player lets off the trigger, or a certain amount of time passes.
* PirateParrot: One of the enemy types you face during a Pirate invasion, they're very weak but very fast and can hit surprisingly hard.
* PlanetHeck: Dig too far down and you'll end up in the Underworld, filled with lava that will more than likely kill you instantly, powerful monsters, and ore you can't even touch without hurting yourself unless you have a special accessory.
* PlantHair: The Dryad might have this. Due to the pixellated style of the game though, it's hard to tell, and so the only details we get to see are people's... [[GagBoobs Interpretations]] in FanArt.
* PlayerGuidedMissile: The Magic Missile and its upgrades can be controled by the mouse/right analog stick, and can also be used as a portable light.
* PlayerVersusPlayer: A game type available in Multiplayer.
* PlungerDetonator: The world generation in 1.3 now spawns all explosive blocks connected to an ''{{incredibly obvious|Bomb}}'' one, to the relief of many players. You'd have to either [[SchmuckBait activate them yourself]] or land on top of them in order to blow yourself up.
* PotionBrewingMechanic: There are two types: potions are made at an alchemy station or placed bottle, and grant a temporary buff, while flasks are made in the imbuing station, and grant an additional effect when wielding melee weapons.
* PowerDyesYourHair: The Hairstylist sells you special dyes that take more vibrant colors if you're at full health, full magic, or have lots of coins. The Clothier sells clothing dyes that have the same effect on your outfit.
* PowerEqualsRarity: Played with. Every generated world has a handful of incredibly powerful weapons. The weapons themselves are guaranteed to be inside special chests which are always in a generated world. The ''keys'' for those chests are a different story and, while they can drop off any enemy in a given area, the drop rate is around 1 in 2,500.
* PowerfulPick: While pickaxes are always weaker then the same tier weapon, the autoswing is very useful in the early game, and they can help fend off monsters that decide to attack you while you're in the middle of digging up mineral deposits.
* ThePowerOfTheSun: The [[EldritchAbomination Solar Pillar]] is able to rain solar fireballs on the player. The [[FlunkyBoss mooks that accompany it]] are also fire- and sun-themed.
* PowerPincers: Skeleton Prime has the Prime Vice arm, a melee arm with a pincer that tries to make contact with the player and deals very heavy damage should it succeed.
* PowersDoTheFighting: The Star Cloak causes stars to fall out of the sky and injure anything that harms you. If used against weak enough enemies, the Cloak can easily take them out with no involvement from the player.
** The Turtle Armor will reflect any melee damage done to the player back to the source using the target's defense instead of the player's (which is usually much higher). Relying on this to kill things can take a while, though, and if you're getting hit by anything strong enough, you'll still take hefty damage in the process.
** Kind of the entire point of [[MinionMaster Summoning weapons]].
* PrecisionGuidedBoomerang: Represented in the game by the Enchanted Boomerang, Flamarang, and Thorn Chakram which supposedly have limited seeking ability for enemies. They are also capable of returning to the player through solid walls. The Possessed Hatchet outright seeks out your foes.
* PressurePlate: The game also has these, either purchased from the mechanic for 20 silver a pop or found naturally in caves hooked up to a BoobyTrap.
* PsychoStrings: The surface Corruption's theme uses these towards the end of the track.
* PublicDomainArtifact:
** The game has a UsefulNotes/{{Muramasa}} that is extremely fast, swings constantly when you hold down the attack button and can only be found in a dungeon. It is also used the craft the strongest Pre-Endgame sword.
** The game has {{Excalibur}} as the Hallowed-tier sword. Auto-swing makes this a very good blade, but it can be further upgraded into the True Excalibur (which features {{Sword Beam}}s) and then into the Terra Blade by combining that with the True Night's Edge.
** The PhilosophersStone appears as an accessory that reduces the amount of time the player has to wait for another chance to use a healing potion.
** The Gungnir is a giant golden spear with a red gem in the spear head.
* PurelyAestheticGender: Initially, the game had no gender option, simply allowing a player to choose default features that made the character look male or female. A later patch introduced the option to be male or female, with existing characters flattening out into male. So there are a lot of crossdressers in ''Terraria'' now. Characters of either gender can wear any equipment. With Gender Change Potions, players can GenderFlip characters at will.
* PurpleIsTheNewBlack: The game uses purple to denote the shadow like theme of TheCorruption, even the craftable Shadow Armor is purple (of course, armor dye can make it black if you wish).
* QuicksandBox: Like with ''Videogame/{{Minecraft}}'', get used to dying a lot while you learn the ropes.
* RainOfArrows: The Daedalus Stormbow, instead of firing normally, will spawn 4 arrows to rain down on the target for the price of one. With most other bows, the player can invoke this by simply firing upward and letting gravity do the rest.
* RainOfSomethingUnusual: One of the game's various random events is for [[BlobMonster slimes]] to fall from the sky.
* RandomEvent: Meteors can fall without breaking a Shadow Orb/Crimson Heart, The Eye of Cthulhu can show up anytime you have +10 hearts and haven't fought him once yet, Blood Moons cause a mass of zombies and Demon Eyes to spawn and seek you out while allowing zombies to open doors, and the Goblin invasion. Hardmode random events include the Solar Eclipse and one of the Hardmode boss encounters at night. Rainfall can cause Slimes holding umbrellas and flying fish to fill the air, as well as compel zombies to wear raincoats. Slime Rain makes hordes of slimes rain from the sky, eventually culminating in the King Slime itself turning up to challenge you.
* RandomlyDrops: Some items can only be found as rare drops. Taken UpToEleven with the 1.2 update. Now nearly EVERY enemy has a rare drop! Happy hunting!
* RandomlyGeneratedLevels: In the modern pseudo-{{Roguelike}} vein of having an entire world randomly generated.
* RapidFireFisticuffs: The Fetid Baghnakh are one of the two glove-type weapons in the game. They also happen to have the highest attack speed of any weapon in the entire game: with the right modifiers and equipment they can rip through bosses in seconds, provided you manage to get in range.
* RareRandomDrop:
** ''Way'' too many to list, but the crowners go to the five Dungeon Keys (Corrupt, Hallowed, Crimson, Jungle, and Ice). During 1.2.0.3.1, a mould of them dropped in the corresponding biome with a 1 in 2,500 (0.04%) drop rate (previously 1 in 4,000 or 0.025%), which then needs to be used with souls from Hardmode bosses and the key from the jungle's Hardmode boss to craft. In later versions, the key is dropped directly, instead of the mould. Without setting up a serious enemy farm, chances are you'll never see one of the moulds/keys. What the keys unlock though is ''well'' worth it.
** The Coin Gun, that uses your money as ammo with damage varying on the value of the coin. It has a 0.0125% chance of being dropped by Pirates (except the Parrot, which doesn't drop it, the Captain, who gets a 0.05% chance, and the Flying Dutchman, who gets a 0.25% chance). Other rare drop from pirates include the Lucky Coin, the Discount Card and the Gold Ring, although not to the extreme of the Coin Gun.
** The Slime Staff has a 0.01% chance of being dropped by almost all types of Slimes, or 1% from the very rare Pinky slime. Fortunately you can build a slime farm for this one.
** The Bananarang has 3,33% chance of being dropped by Clowns. This doesn't seem too bad, but it's an enemy that only spawns rarely on the randomly occuring hardmode Blood Moon. Chances are you'll only see a couple of them at most during a Blood Moon, you'll need one of them to drop the Bananarang, and then you need 10 of them to have a full stack, which will require several drops...
** The Amber Mosquito is rarely obtained from Extractinators: 0,02% when using silt or slush or 0,06% when using desert fossils.
** If you're a completionist, there's the banners for the Nymph, Tim and the Rune Wizard. They're obtained after killing 50 of three rarely spawning enemies.
** As of 1.3, Expert Mode partially mitigates the rare random drops by somewhat improving the odds of a number of them. Still, not all of those items have their drop improved, and even then, it's usually only doubled (1% to 2% is not much of an improvement).
* ReallySevenHundredYearsOld: The Dryad. She hints at this during a random conversation. ''"I wish that [Name of Arms Dealer] would stop trying to hit on me, doesn't he realize I'm 500 years old?"''
* ReducedManaCost: Wearing the entire set of Jungle Armor will reduce the mana cost of all magic items by 16%. This stacks with the Nature's Gift accessory, which reduces mana costs by 6%.
** This is common with most sets of mage armor, which helps make up for their [[SquishyWizard lack of defense]].
** In addition, the Space Gun uses mana instead of ammo, unless you're wearing the full set of Meteor Armor, in which case the gun uses neither ammo nor mana. The gun makes for quite an efficient long-range weapon, so even though there are higher-tier armors than the Meteor Armor, you might find it worthwhile to stick with it.
** The Crystal Ball furniture item can grant you a buff that overall boosts your magic ability, including a discount to mana costs.
* ReedSnorkel: A breathing reed is one of the various items, though its use is limited due to the shallowness it requires. You can breathe perfectly for up to three blocks underwater, and double your breath for any further depths. You also can't use any other item while using it, and due to the simplistic way the game handles water physics, you can easily dig air pockets above you even if you're in progress of draining an entire ocean.
* RegeneratingHealth: Health slowly regenerates, with the rate slowly increasing over time but resetting when taking damage. The Band of Regeneration, Celestial Charm, Shiny Stone, campfires, Heart Lanterns, and touching honey (the boost sticks around after you leave the honey for a short period) provide a significant increase in the rate. A couple of types of armor, Crimson and Palladium, also increase your regeneration rate. Curiously, harmless critters also regenerate health, assuming they're not killed in a single hit.
* RegeneratingMana: The game has regenerating mana that varies in rate according to how much mana you currently have. The more you have available still, the faster it'll recover. One side effect of this is that it'll take forever to regain enough to cast certain spells when your maximum mana is low, but after getting enough upgrades you can use spells pretty much indefinitely just by pacing yourself. Placing a Star in a Bottle nearby will give you a boost to your mana regeneration.
* RegionalBonus: The Playstation 3 port of ''Terraria'' is being published in Japan by Chunsoft, and if you watch closely during [[http://www.youtube.com/watch?v=Wz5M_xKFs_E this trailer]] you can spot the player wearing [[VisualNovel/{{Danganronpa}} Monobear]] and VideoGame/ShirenTheWanderer costumes.
* RequiredSecondaryPowers: The water breathing potion makes it so that you drown in the air while it has its effect. However, if you wear a fish bowl on your head, you can go in and out of water just fine.
* RockPaperScissors: As [=NPCs=] can now converse with each other in 1.3, they sometimes engage in this game with each other, you can even see who uses what gesture and who wins in their speech bubbles.
* RocketPunch: The Golem boss launches its fists at you; it can sometimes drop its arms, which you can then wield as a Flail-like weapon that behaves like a Rocket Punch.
* RollercoasterMine: With the Minecart Track elements introduced in version 1.2.4, you can make your own tracks.
* RuleOfCool: [[MoreDakka The]] [[EverythingsEvenWorseWithSharks Minishark and Megashark]]. ''Half shark, half gun, all awesome.''
* SaveScumming: You can attempt this if you want to try for a good prefix when reforging by simply hitting Alt-F4 to avoid saving the game before quitting and losing all your money wasted on reforging. However, it can be time consuming.
* SandWorm:
** The worms you find underground are no less than twice as long as you are tall.
** Their corrupted brethren, the Devourers, are fatter, larger and meaner. Their [[KingMook boss version, the Eater of Worlds]] is ''even bigger'', and will split into ''more worms'' if cut in half. These smaller worms get faster, but deal just as much damage if they hit you. Do it wrong and you'll have half a dozen crazy worms trying to eat you all at once[[note]]With good armour, this becomes a viable strategy to kill it more quickly[[/note]].
** In the Underworld/Hell scape there are bone serpents.
** Once Hardmode is unlocked, you now also have Diggers and World Feeders, essentially bigger and stronger versions of the Giant Worm and Devourer. And then you also have the Eater of World's bigger brother, The Destroyer.
** In the Underground Desert, you can find Tomb Crawlers and, in Hardmode, Dune Splicers, the latter of which is a direct ShoutOut to ''{{Literature/Dune}}''.
* SceneryPorn: The overworld backgrounds added in 1.1, later made even better in 1.2, are rather nice-looking, and change depending on which biome you happen to be in.
* SchizoTech:
** In the same game that shows players running around in metal armor, swinging swords and fighting goblins, you also have firearms, [[{{Magitek}} mana-powered laser guns]], lightsabers and the jet pack-like Rocket Boots.
** Special mention goes to the Minishark and its upgrade the Megashark, which are fully automatic miniguns that shoot ''musket balls''.
** And also the wires and switches system, where it is possible to have a wall switch or timer that turns ''tiki torches'' on and off.
** 1.2 gives you a {{Cyborg}} [=NPC=] that sells appropriately high-tech items like Rocket Launchers; and a {{Steampunk}} representative [=NPC=] that sells a Jetpack and a teleporter.
* SchmuckBait: One of the possible title messages says: Press alt-f4. (Alt-f4 is used in Windows to close a window.)
** Occasionally while traveling underground, you can find a large ore vein with a PlungerDetonator which will set off Explosives that will mine all the surrounding ore...and also blow up anyone unknowing enough to have activated it.
** While going underground you may encounter a Lost Girl which looks and acts as the characters you can rescue to invite them to your town...until you approach her and she turns into a Nymph which can rip you to shreds.
* TheScourgeOfGod: The Wall Of Flesh only appears when you chuck a voodoo doll of someone you know into a pit of lava.
* ScratchDamage: Every attack will do at least 1 damage. An important factor in most Dungeon Guardian killing strategies.
* SegmentedSerpent:
** The Eater of Worlds is the most dramatic of these, but there are others. All of the other worm enemies have multiple segments of varying size and HP, and to kill them, you have to destroy any one. This can prove difficult with Bone Serpents.
** With the inclusion of debuffs, these enemies become very vulnerable to [[KillItWithFire flamethrowers]] and [[HellFire cursed flames]], as each segment burns individually, draining their HP very fast. Except Destroyer, who is ''completely immune'' to all debuffs.
* SeldomSeenSpecies: Arapaima fish in the Hardmode Jungle biomes.
* SequenceBreaking:
** There are numerous methods available to enter the Lihzahrd Temple before defeating Plantera. You can teleport in using a Rod of Discord or two teleporter pads from the Steampunker [=NPC=], or you can place angled blocks around the door and use Actuators to "disable" them and walk in. Entering the Lihzahrd Temple early can get you access to advanced traps and unique furniture items, but the Golem boss still can't be summoned unless you defeat Plantera first.
** Copper tools can mine gold ore, which will make equipment (especially the pick) that becomes the first real improvement to your starting gear, making the other ores in-between entirely skippable.
** With some skill, players can actually bypass the base mineral armor sets and simply kill the Eater of Worlds a couple of times to get the raw material to forge a set of Shadow Armor. It is also possible to do this with the Brain of Cthulhu and the Crimson Armor set.
** In a Corruption world, players can also bypass mineral armor sets by slaughtering Eaters of Souls (which spawn frequently in Corruption) for the Ancient Shadow Armor they drop. The pieces have the same stats and are interchangeable with Shadow Armor crafted from Eater of Worlds-dropped material.
** With the addition of fishing we get the Reaver Shark, a rare fish which can be used as a pickaxe, and can mine anything up to the first hardmode ore (either Cobalt or Palladium). So if you get lucky with your fishing early on you can just skip all of the normal mode pickaxe tiers entirely!
* SerialEscalation:
** At first it was a relatively simple sandbox game similar to ''VideoGame/{{Minecraft}}'' (except 2D, don't forget that), with rather tame boss fights, the hardest of them arguably being Skeletron. Then came the 1.1 update, which felt more like an expansion pack than an update, with an entire slew of new content, most notably four new bosses, all of them significantly tougher than the original three. The focus also shifted more towards combat and farming for new equipment with the introduction of Hardmode, which not only introduces new enemies that are as common as regular zombies and hit harder than Skeletron, but also new weapons and armor that are much stronger than the pre-hardmode ones. ''THEN'' there was the 1.2 update, which brought a whole new mess of content like the 1.1 update, and adds more monsters (some of them '''stronger''' than Skeletron Prime) and new equipment that completely outclass all of the equipment found in the original release.
** If the Moon events become a trend, it might end up this way. Pumpkin Moons caused players to rethink their boss fighting setups, especially after acquiring the new drops that exploit certain mechanics allowing them to easily cheese the last wave. Then came the Frost Moon where those same tactics became of limited effectiveness, compounded by harsher wave progression requirements and a higher number of waves. Then players started to reach the final wave solo, initially deemed nigh impossible without multiple players. Cue the previous Pumpkin Moon event becoming a joke to players possessing Frost Moon equipment.
** The 1.3 Big Update takes it to a new level with Cultists and Alien invasions, as well as a new boss that will spawn after a special Invasion event. There are also new enemies added to several pre-existing Invasion events to make them more interesting, and about 800 new items added, as well as a significant upgrade to the Inventory subscreen.
* SetBonus: Most sets of armor (generally those made out of the same material or gathered from a similar source) feature these. Some of them just boost your defense, but others speed up your attacks/movement, reduce mana usage, or emit light. End-game builds, however, do not always favor the very-much-unique set bonus, in favor of mixing and matching different parts from different tiers to stack certain mods, sometimes leading to a case of {{Crippling Overspecialization}}.
* ShamuFu: There's a number of fish weapons/tools you can find in 1.2.4 with the introduction of the Fishing mechanic, including the stereotypical Swordfish and Obsidian Swordfish (which interestingly enough handle like spears), a Saw-tooth Shark that handles like a [[ChainsawGood chainsaw]], and fishes that act like pickaxes and hammers.
* ShapedLikeItself: The Santa Claus [=NPC=] could -- before a fix -- spawn with the text 'Santa Claus the Santa Claus has arrived'.
* ShearMenace: If threatened, the Stylist [=NPC=] will defend herself with a pair of scissors.
* ShiftingSandLand: There are occasional deserts strewn throughout the map. The 1.3 update adds an Underground Desert to the mix.
* ShipTease: [[InterspeciesRomance The Goblin Tinkerer and the Mechanic]] are always asking about each other. The 1.2 Big Update adds paintings, one of which is titled "Terraria Gothic" and features these two 'lovebirds' posing together in the fashion of the ''American Gothic'' painting.
* ShortRangeLongRangeWeapon: Mostly averted, but the Jester arrows tend to explode into a harmless cloud of flashing lights a few feet after they are shot.
** The Celebration, a drop from the TrueFinalBoss, fires two fireworks that explode after a short distance, placing it squarely in AwesomeButImpractical territory.
* ShortRangeShotgun: Played straight with the hardmode firearm, [[CaptainObvious the Shotgun]]. You won't hit stuff much farther than a few inches from your character, but since it uses 1 round to make 4 damaging pellets (much more so with Crystal or Cursed bullets), it's a beast at (close to) point blank range. The Tactical Shotgun is not immune either, but when they're loaded with [[HomingProjectile chlorophyte bullets]], their range drastically improves.
* ShoutOut: They have their own section [[ShoutOut/{{Terraria}} here]].
* SignatureRoar: Most bosses use the same roar sound effect when transforming into their second form. Whenever you hear this, you know something bad is about to happen.
* SiliconBasedLife: The Meteor Heads. They are flying Mooks that spawn at meteorites and [[GoddamnBats attack en masse]].
** Version 1.3 introduced Granite Cave sub-biomes, which feature Granite Elementals and Granite Golems.
* SillyReasonForWar: You may frequently find yourself stuck in the middle of a goblin invasion, which only ends after the player has killed dozens of goblins (hundreds or even thousands in multiplayer). According to the pacifist Goblin Tinkerer, the goblins are waging war over cloth (which is also a reference to the fact that you can summon an invasion with the Goblin Battle Standard).
* SkeletonsInTheCoatCloset: The Necro Armor is made of bones and cobwebs. The Fossil Armor, which appears to be a dinosaur skeleton, is made from Sturdy Fossils.
* SkeletonKey: The rare "Shadow Key" found in the Dungeon's locked chests. Once you have just one, it'll be all you need to unlock every Shadow Chest in the game.
* SkippableBoss:
** King Slime, Queen Bee, and Duke Fishron do not need to be fought for any reason related to the main plot. They hold no items that you require to progress, and summoning them has no effect on the world.
** Skeletron, guardian of the Dungeon, used to be this. Though the Dungeon has some nice equipment and you do have to beat Skeletron to get to it, it doesn't relate to game progression in any way. The 1.2 update added several pieces of endgame content to the Dungeon and its mobs, and Skeletron has to be defeated if you want to reach the TrueFinalBoss.
** In an example of SequenceBreaking, you can avoid fighting the Eater of Worlds/Brain of Cthulhu entirely -- both uniquely hold items required to make pickaxes that can mine stronger ores than gold/platinum -- if you manage to fish up the Reaver Shark, a pickaxe which can mine any pre-Hardmode ore. You just need to survive the Underworld long enough to dig up enough Hellstone for some Molten armor with at-best Platinum gear.
* SkyPirate: The Pirates might be this, as their flagship is a flying pirate ship called the Flying Dutchman.
* SlidingScaleOfLinearityVsOpenness: You spawn with some basic tools and a Guide who tells you what you can build with any materials you have on hand and gives you tips on how to survive in the long term. Otherwise, it's up to you.
** The game's a borderline 5 or 6. While you are free to explore (mostly) wherever you want, the game has clear-cut boundaries on where you can, and how far you can go. A lot of the game's focus tends to be on Boss-Hunting, especially after the addition of stronger versions of previous bosses in the 1.1 update. Many people got bored of the game after defeating all the bosses, simply because the game was set up as a sandbox game; so there was no plot or sidequests to follow afterwards.
*** The 1.2 update adds new biomes (area types) and bosses to go with them. Oddly enough, this actually makes it a little ''more'' rather than ''less'' structured, since you can only reach certain bosses after defeating others (you can't get to Golem until you've defeated Plantera at least once, because you need the Temple Key Plantera drops to enter the area where Golem spawns).
* {{Slimes}}: The basic and first monster you run into in the game. Has reached meme status on the fan forums.
* SlippySlideyIceWorld: The Snow biome. The 'slippy' part was expanded on in 1.2 with the addition of ice caverns and ice blocks.
* {{Snowlems}}: Using the Snow Globe you get from Presents will summon the Frost Legion, which is an entire army of these. They're a lot harder than the Goblin Army.
* SoftWater:
** You can fall for a whole minute and survive if you land in water one and half a blocks deep. Yes, falling from the surface to the Underworld (about 1 mile all told) into a puddle ''half as deep as your character is tall'' lets him/her survive completely unscathed.
** This also works with lava, but if the person doesn't catch on quick enough they can easily burn to death instead.
** Honey works fine for this as well, with the added bonus that you'll get a regeneration buff once you dip in the honey landing pool.
* SoLastSeason: Before the 1.3 update, one could get through the majority of Hardmode with the [[GameBreaker Vampire Knives or Spectre Armor]], thanks to their LifeDrain abilities. Then the 1.3 update came, and these weapons/equipment hit a brick wall against [[spoiler:the Moon Lord]], who gives the player a debuff that makes all LifeDrain effects useless against it.
* SoundtrackDissonance:
** The Hallow's music can sound fitting at first, while you're delighted by the shiny colors, but soon you'll be fighting deadly unicorns with that music on...
** The Frost Moon plays a happy, Christmas-like melody while it's active. Therefore, you'll have to fight haunted Christmas trees, giant Santa robots, flying ice demons and many other abominations in what's currently the hardest event in the game while you're hearing that song.
* SpamAttack:
** Some magic weapons can be used this way, if you have enough mana.
** 1.2 and its subsequent updates introduced many melee weapons that have ranged and/or area-of-effect capabilities. Needless to say, spamming those attacks are a given since melee weapons cost ZERO mana. Taken even further if said melee weapon has auto-swing capabilities.
* SpikeBallsOfDoom: The game has these as a throwable weapon. As well as perpetually rotating ball-n-chain's spawning in dungeons.
* SpinToDeflectStuff:
** Averted with [[DemBones Skeletron]], whose defense drops to zero while spinning. Played straight with Skeletron Prime, whose defense doubles while spinning.
** The Selenians accompanying the Solar Pillar can reflect projectiles when doing their spin-jump attack.
* SpreadShot: Quite a few spells are of the Spray Burst variety. Some other weapons, including the Shotgun, Venom Staff, and Vampire Knives are the Initial Burst type.
* SprintShoes: Several accessories allow you to run faster. Also, wearing a full set of Shadow Armor gives a speed boost. Most {{Set Bonus}}es from higher-end armors include a movement speed buff. It's especially prevalent in melee-oriented armor, but plenty of ranged or magical armor will grant small speed increases.
* SquishyWizard:
** The Goblin Sorcerers have the least hit points and defense in the Goblin Army, but they shoot projectiles that can travel through walls, making them the most dangerous enemies during a [[ZergRush Goblin invasion]]. At least until you get to the [[BossInMookClothing goblin summoners]] in hardmode.
** Also applies to the player -- magic-oriented {{Set Bonus}}es tend to have good boosts to magic, like extra mana or mana cost reduction, but are generally rather flimsy for defense.
* StalkedByTheBell: Taking too long to kill most bosses either causes them to leave or, in the case of Skeletron and Skeletron Prime, become practically invincible and able to kill you in 1 hit.
* StandardStatusEffects:
** Poison: Poisoned and Venom, the difference being that Venom takes more life per second and can't be prevented by wearing a bezoar (as Poisoned can). Since 1.3, there's also Electrified, which takes more life while moving than standing still.
** Burn: Burning (caused by coming in contact with hot blocks, it's the only one that can be prevented, by using an obsidian skull), On Fire, Cursed Inferno, Shadowflame and Frostburn (the latter can only be inflicted ''by'' players, though). All of them do damage over time, the only difference among them being the source, how much life they take, and whether they can be extinguised by entering water.
** Paralyzed: Webbed, which prevents the player from moving (but not from using items).
** Silenced: Silenced, which prevents the player from using items that require mana.
** Blindness: Three variants which reduce the field of vision, Blindness, Blackout and Obstructed, the difference being that the two latter are more intense and can't be prevented by wearing a blindfold (as Blindness can).
** Berserk: Tipsy, caused by [[BoozeBasedBuff drinking ale]], which reduces defense but enhances physical stats. Despite being considered a negative status, the defense drop is barely noticeable in later stages of the game, while the physical buffs are quite important.
** Frozen: Frozen, which prevent the player from moving or using items.
** Petrified: Stoned, which not only prevents the player from moving and using items, but increases fall damage, which means a fall while affected by this debuff will likely be lethal. It also negates fall damage protection, like the Lucky Horseshoe.
** Slow: Chilled and Slow, which reduce movement speed, the latter being more intense than the first.
** Fear: Distorted, which causes the player to constantly rise and fall in midair. In addition, when applied to enemies, Confused makes the enemies to run away.
** Meta-Effect: Confusion, which actually works by reversing the player controls.
** Cursed:
*** Cursed, which prevents the player from using items.
*** Weak, which reduces all physical stats.
*** Ichor and Broken Armor, which reduce defense by 20 and to half its value, respectively.
** Decover: Bleeding and Moon Bite, which prevent the player from regenerating health (the former passively, the latter through life steal).
** Other: Feral Bite, which increases the player's offense but lowers regeneration... as well as periodically giving them ''other'' random StandardStatusEffects.
* StarPower: The [[EldritchAbomination Stardust Pillar]] is able to summon a constellation of "stars", which spawn alien mooks to attack the player. The [[FlunkyBoss mooks that accompany it]] are also star-themed.
* StatusBuff:
** Done via equipment that fits into slots and potions the player creates out of various ingredients.
** Equally, there are status debuffs, including potion-drinking cooldowns, being on fire, darkness (reduced light vision), and cursed (unable to use items).
* StealthPun:
** The RandomlyGeneratedLevels and [[RandomlyDrops random drops]] mean that seeking a particular item is often a LuckBasedMission. Appropriately, the game's items include a horseshoe, [[CatchAFallingStar fallen stars]], the [[EpicFlail Blue Moon]], a [[{{Balloonacy}} shiny red balloon]], [[HeartContainer hearts]], and some Rainbows (in the forms of a magical rod and a flamethrower-like gun). No [[http://en.wikipedia.org/wiki/Lucky_Charms clovers]], though.
** There is a potion that allows you to conserve ammo, thus enabling MoreDakka. The ingredients for such potion include a [[CallOfDuty cod]].
* StickyBomb: Can be created by combining slime gel with bombs. The bombs, sadly, only stick to terrain and not monsters.
* StockBeehive: The game has giant hives deep underground in the jungle that resembles Wasp Nests, with honeycomb walls and honey, as well as a Queen Bee BonusBoss.
* {{Stripperiffic}}: The Dryad, as well as the Dryad-themed vanity/social costume.
* StuffBlowingUp:
** You get quite a lot of explosives from pots and chests, and the Demolitionist is mad about explosives. One of his quotes is "Why purify the world when you can just blow it up?" Funnily enough, using explosives is a perfectly valid method of removing the corruption.
** Rocket Launchers, Grenade Launchers, and Proximity Mine Launchers all share four types of rocket ammo, two of which can destroy terrain.
* StunLock: Possible with many weapons, ''especially'' the Vilethorn and Nettle Burst. If it can be stunlocked, the Vilethorn/Nettle Burst will stop it. Newer weapons like the Razorpine attack so fast that catching certain bullet-spongey enemies in your hail of projectiles is almost guaranteed safe to just stand in front of it while you wait for it to die. Melee specialists can eventually find/craft an accessory that improves their weapon attack speed and knockback, allowing them this as well.
* SuperSpeed: The [[Myth/ClassicalMythology Hermes Boots]], which let you run super-fast, but interestingly ''don't'' give you super-acceleration; you'll need a long run-up to get up to speed, though you can get around this by [[GrapplingHookPistol grappling]] towards the ground while in midair and releasing the hook before it attaches you to the ground.
* SurvivalSandbox: Permadeath mode turns it into one.
* SwissArmyWeapon: The Drax is some kind of strange artifact that can be used as a drill and chainsaw, and also works reasonably well as a weapon (in earlier versions, it was called the Hamdrax and could act as a hammer, too). Ditto for Picksaws and The Axe.
* SwordBeam: Several new swords introduced in 1.2 are given these capabilities. The lowest of which is the Ice Sword that can only fire an ice shard every few seconds to the [[InfinityPlusOneSword Terra Blade]] that can fire beams that penetrate multiple enemies until dissipating. Being a sword, it benefits from melee bonuses, giving melee players a ranged attack of sorts.
* TakenForGranite: The Medusa mobs in the Marble mini-biome can petrify you with their unique attack.
* TakeYourTime: When the Goblin Army warning appears at dawn, and you are a good distance away from your base (assuming it's near the center of the map), there's no need to hurry there to fight them. The army will only arrive once you're close enough to your base; otherwise, you can delay the invasion simply by continuing what you're doing. When you do finally go home, the sequence will begin immediately, so it may not be wise to keep waiting until you've forgotten about the approaching goblins.
* TechnicolorFire:
** [[{{Hellfire}} Cursed Flames]] and related items/[[StandardStatusEffects debuffs]] are an insidious green, and cannot be extinguished by diving into water.
** Wearing the Frost armor will add a Frostburn effect to your melee and ranged weapons, making them covered with blue ColdFlames.
** The Goblin Summoner drops Shadowflame weapons, which have purple fire.
** You can also craft torches of many different colors using gems.
* {{Teleportation}}: The Magic Mirror, which teleports players their spawn point. An actual teleporter was added in the 1.2 update which could be purchased from an NPC. As well as the "Rod of Discord" item, which allowed the player to blink to where ever the mouse cursor is.
* TeleportationMisfire: The Teleportation Potion teleports you to a random location. It is advised to prepare oneself before using a Teleportation Potion, as it may teleport you into a hazard, on top of a trap trigger, or something else dangerous.
* TeleportationSickness: The Rod of Discord allows the players to teleport anywhere on the screen but also give you a Chaos State debuff that lasts for ten seconds and teleporting before it wears off results in massive, unblockable damage.
* TeleporterAccident: The game plays this straight with the Rod of Discord, which is used to teleport over distances. If the item is re-used during its cooldown period, it will cause heavy damage to the user. The game lampshades this if the teleport damage is fatal, mentioning that the player failed to rematerialize or now has feet where their head used to be.
* TeleportSpam:
** Three of the pre-hardmode magic-based enemies tend to do this a lot. The imp which appears in hell, the magic skeleton found in the dungeon, and the goblin mage which appears during a goblin invasion. Unlike the two location/biome specific enemies, the Goblin Mages can appear in a player's buildings during a goblin invasion. Their magic bolts pass through walls, injuring [=NPCs=] and player alike. That's right, even housing your allies in the thickest garrison or the most secure base can still get them killed from a randomly-teleporting goblin. At least they can defend themselves now, as of 1.3.
** Chaos Elementals teleport more frequently and appear just as randomly. They run at you and teleport all over the place to confuse you.
** Two hardmode dungeon enemies, the Necromancer and the Diabolist, teleport everytime they are injured. Not only are their spells annoying, but they teleport away after getting hit or after having been in one spot long enough.
** Similar to Necromancer and Diabolist, the Nebula Floaters fought near the Nebula Pillar teleport every time they are injured. To make things worse, they can also fly and phase through solid blocks.
** There is a rare drop from the Chaos Elemental, the Rod of Discord, that lets you teleport as they do. A patch nerfed it so the player has to CastFromHitPoints if they want to spam, as the player's potentially absurd power combined with the Chaos Elemental's rapid teleportation, without so much as a mana cost, was not exactly well balanced. Later patches refined the Teleportation debuff of the staff, tuning it to be more or less powerful.
** An elaborate system of teleporters can become this with clever manipulation of wires, switches, and timers.
** The Brain of Cthulhu frequently teleports, forcing you to fend off attacks from different angles. It teleports even more frequently after it TurnsRed.
** In Expert mode only, when Duke Fishron is very low on health, he enters a third attack phase where he starts teleporting and charging at you from different angles, much like the Brain of Cthulhu's second phase.
* {{Terraform}}: The game lets you plant trees and build mountains and such, but you can also change the surrounding biomes!
* TerrainSculpting: In addition to allowing free modification of terrain, the game lets you dig up ''entire biomes'' and place them somewhere else for easier farming of crafting materials.
* ThemeNaming: In Hardmode, some monsters and bosses drop Souls of [[RhymesOnADime Flight, Light, Night, Might, Sight, or Fright]].
* ThisIsADrill: When you get access to Cobalt/Palladium, Mythril/Orichalcum and Adamantite/Titanium, you can make drills. They smash through stone like pickaxes, and they do so very, very fast. You can also use them as a weapon, of course, and they don't do too badly against small foes. Chlorophyte also has a drill, although working range bonus aside, it is redundant as it is no more powerful than the tools required to mine chlorophyte, one of which is Drax, a pickaxe-axe combination.
* ThisIsGonnaSuck: The message displayed when The Twins are about to spawn is "This is going to be a terrible night..."
* ThreateningShark: Thankfully they only show up in the edge-of-the-map oceans unlike the smaller aquatic enemies. They are powerful enough to be a serious problem for a character with midgame equipment.
* ThrivingGhostTown: A world can have a maximum of twenty-two friendly {{NPC}}s (twenty-three during the Christmas season). Although Terraria requires each of these [=NPC=]s to have a home to live in (and thus would constitute a small Thriving Ghost Town if a player built an actual ''house'' for each [=NPC=]), a "home" can be as simple as a room in a much larger structure, so it's more commonplace for players to construct a base or fortress instead of a town.
* ThunderboltIron: Meteorite Ore, which can be mined from meteors that fall after breaking a Shadow Orb/Crimson Heart. It can be forged into bars and used in the construction of various space-themed items. Notable examples include [[LaserBlade Phase]][[StarWars blades]], the [[FrickinLaserBeams Space Gun]], and a set of armor that reduces the mana cost of the Space Gun to zero.
* TimeLimitBoss:
** Most bosses have to be defeated before sunrise, or they will run away. Skeletron and Skeletron Prime will [[StalkedByTheBell try to instantly kill you]] instead. The Wall of Flesh will travel from one end of the map to the other as you fight it, and will instantly kill you if it reaches the other side, which has the side effect of the "time limit" being different depending on the size of your world.
** While not exactly a time limit, do be careful to not lure Plantera to the surface or outside of the Underground Jungle. If you do, it won't take kindly to it and rip you to shreds. As of 1.3, the same goes for Duke Fishron if you lure him outside the Ocean.
** The Moon events have the major boss-level enemies fleeing extremely quickly at 4:30AM, while it is possible to catch lesser mobs remaining as they do not flee as quickly.
* ToiletHumor: There are several items that exhibit this.
** Amongst the furniture in the game, you can craft and place iron/lead bathtubs and ''water-closets''. As of the Big 1.2 Update and the introduction of the Pirate Invasion event, you can also get a ''golden'' toilet as a rare drop from pirates. For the purposes of [=NPC=] housing, toilets count as chairlike surfaces. It is possible to create a village with all the [=NPCs=] having 'thrones' instead of normal chairs to sit on.
** The ''Golden Shower'' Hardmode weapon.
** You can get a Whoopee Cushion, which can be combined with a Cloud in a Bottle to get a Fart in a Bottle, and then combine THAT with the Shiny Red Balloon to get a Fart in a Balloon as of version 1.2.1.1.
** Players can build oversized pixel art of toilet humor-related things if they want to.
* TooAwesomeToUse: The Star Cannon. Shot for shot, it's the most powerful weapon in the game, and it can be crafted fairly early. The catch is that it uses Fallen Stars as ammo. Fallen Stars are dropped at a very low rate at night (you'll get maybe 20 a night if you have a skybridge and scour the world), are used in many other crafting recipes (including the essential Mana Crystals), and can't be reused once fired. Furthermore, the Star Cannon has a ludicrously high rate of fire, so even with armor that reduces your ammo consumption, you'll end up burning through your star stockpile at a fairly quick speed.
* TooDumbToLive:
** When night falls and monsters begin assaulting your home, [=NPCs=] stop wandering around and hide in their rooms. They don't, however, necessarily ''close the doors behind them.''
** During the [[OurGoblinsAreDifferent Goblin Army]] event, in which hordes of goblin warriors and wizards attack your town, the [=NPCs=] continue to walk around outside. Because it's daytime. It's always safe in the daytime, right? Taken UpToEleven between the 1.2 and 1.2.2 updates: they would run around in a '''Solar Eclipse''' and easily get murdered by vampires and swamp monsters (thankfully, the 1.2.2 update fixed that).
** If you don't have a shelter that can support your guide (it requires a table, chair, and light source), he will constantly wander near you. This means ''constantly opening the doors to let zombies in''.
** In general, friendly [=NPC=] behavior is relatively simple. They can easily get themselves trapped out in the open and be unable to find their way back unless you literally wall their path every step of the way. They're honestly better off if you just wall them inside your house. Houses need at least one entrance to be considered suitable. There's no rule saying the [=NPC=] has to be able to ''reach'' it.
* TookALevelInBadass: The advent of the 1.3 update saw a total revamp of the [=NPCs=]. Now, among other things, they help defend houses against the monsters:
** The Guide shoots arrows.
** The Merchant throws knives.
** The Nurse throws poisoned syringes.
** The Demolitionist throws grenades.
** The Dye Trader wields a scimitar.
** The Dryad uses her nature magic to cast a defensive buff on players and [=NPC=]s close to her.
** The Arms Dealer uses a gun (a pistol first, the Minishark in hardmode.
** The Clothier attacks with Shadowflame magic.
** The Angler throws Frost Daggerfish.
** The Goblin Tinkerer throws Spiky Balls.
** The Witch Doctor uses a blowgun
** The Mechanic swings a huge wrench.
** The Painter shoots enemies with a paintball gun.
** The Party Girl uses confetti-filled Happy Grenades to keep monsters at bay.
** The Stylist uses her ''sharp'' scissors as an improvised weapon.
** The Wizard launches bouncing fireballs.
** The Truffle releases clouds of spores.
** The Pirate fires a chain gun/cannon combo.
** The Steampunker uses a Clockwork Assault Rifle.
** The Cyborg fires rockets.
** Santa Claus throws Christmas ornaments.
** The Tax Collecter swings his cane.
** The Traveling Merchant fires a revolver first, and a Pulse Bow during hardmode.
** The Skeleton Merchant throws bones.
* TotalEclipseOfThePlot: Since the 1.2 update, things get ''really'' hectic in the world of Terraria during a solar eclipse. The easy-to-deal-with slimes are replaced with highly aggressive, durable and surprisingly speedy beasties out for the player's blood until the sun sets. 1.3 takes things further with alien invasions and cultists.
* TranslationTrainWreck: The Spanish version has [[BlindIdiotTranslation a bad translation]] regarding the [=NPC=] quotes, but it gets particularly bad with the [=NPC=] arrival message. Apparently the translators just copypasted the goblin army warning, and completely failed at it (yes, they can't even copy and paste right), because the [=NPC=] arrival message reads as "(name of [=NPC=]) de duendes," which literally means "(name of [=NPC=]) of goblins."
* TraumaInn: Averted. Beds are only good for setting your spawn point. You can't even sleep in them.
* TrickArrow: The game allows you to be quite a good archer, providing you with automatic crossbows and arrows ranging from flaming to firework ones.
* TriumphantReprise: The Hallow theme is a nice remix of the normal Forest biome theme. The Underground Hallow theme is a remix of most of the biome themes in the game.
* {{Tsundere}}: The Nurse can come off as this: Some of her quotes suggest a TeamMom mentality, others that she only sticks around because you pay her.
* TunnelKing: You're required to become one if you want to get much accomplished.
* TurnsRed:
** Many of the game's bosses work this way:
*** At half health, the Eye of Cthulhu breaks open into a giant mouth. It stops spawning minions and begins charging the player much more aggressively.
*** At first the Brain of Cthulhu floats around semi-invisibly as its numerous floating eyes attack you. When the eyes are dead the Brain opens up to reveal a heart and begins attacking you directly.
*** In the console version, Ocram's body changes at half health. Its eyes fall out and a third eye opens on its forehead, it gains more damaging lasers and demon scythe projectiles, and charges constantly.
*** The Twins follow the example of their predecessor the Eye of Cthulhu by also changing at half health. Retinazer gains a large laser cannon and his occasional shots become BeamSpam. Spazmatism gains a mouth and loses his fireballs in favor of a near constant {{Hellfire}} Flamethrower.
*** Plantera's bud opens up halfway into the fight. It becomes faster and more aggressive with its attacks, as well as gaining numerous CombatTentacles and it begins launching damaging spores into the air as it attacks.
*** After the player reduces the health bar of the Golem's Head to zero the head lifts off into the air. It flies around the area and continues launching lasers and fireballs while you have to fight the body, which begins leaping toward you constantly.
*** Duke Fishron's eyes [[GlowingEyesOfDoom glow yellow]] at half health. He now charges the player less times but is much faster and painful, his bubble attack has him do a loop-the-loop resulting in a huge spray, and he now fires only one Typhoon that homes in and summons an ''even bigger Sharknado'' that hurts like crazy and summons even more sharks. In Expert mode, he gains a ''second'' rage mode when almost dead, in which he turns the screen a dark blue and starts [[TeleportSpam teleporting frequently]], making him hard to hit and even harder to dodge.
** Some enemies such as the Wandering Eye, Lihzards, and Eyezor behave this way as well. The Wandering Eye is like a mini Eye of Cthulhu, the Lihzahrd go down on all fours, become immune to knockback and charge the player quickly, the Eyezor goes from slow laser shots to shooting out BeamSpam.
** The Big 1.3 Update adds Expert Mode, which expands mob AI and gives a number of the bosses new Desperation Attacks when they are badly damaged.
* TurnYourHeadAndCough: One of the Nurse's lines upon talking to her.
* TurtlePower: Giant Tortoises in the Underground Jungle and Ice Tortoises in Underground Snow. They have lots of health and armor and are pretty slow, but they utilize a fast spinning attack to move around and deal heavy damage.
** You can collect Turtle Shells from the Giant Tortoises to craft the Turtle Armor, which boasts extremely high defense and a SetBonus of reflecting damage back to physical attackers.
** 1.2.4 adds the Turtle Mount, which improves your mobility underwater when in use.
* UndergroundLevel: Everything between the overworld, which is a GreenHillZone, and the bottom of the map, which is a LethalLavaLand, is this, except for the Underground Jungle and dungeon.
* {{Unicorn}}:
** The Hallow biome spawns unicorns. They are your traditional horse-with-a-horn variety and are invariably hostile. Killing them for their horns is the only purpose they seem to have.
** Using the Blessed Apple (rarely dropped by Hallow enemies) will allow you to ride one as a Mount. It can double jump and accelerates if not obstructed, allowing you to move very fast.
* UniversalAmmunition: The game has a very small selection of ammunition types, but said ammunition feeds a rather diverse variety of guns. For instance, standard Musket Ball ammunition will fire from muskets just fine, but it will also feed BB guns, revolvers, Uzis, shotguns, sniper rifles, and a half-minigun half-shark monstrosity.
* UnlimitedWardrobe: The game added three "Vanity Items" slots just to facilitate this. The slots replace the sprite (but not effect) or headgear, armor, and pants, just to show off all the clothes you've bought and/or made yourself while still being a walking Magitek tank.
* {{Unobtainium}}:
** You have Demonite and Crimtane, which are dropped by boss monsters and found in extremely rare small clusters that are usually only enough for a single bar or so.
** Meteorite, which only appears after you destroy a Shadow Orb/Demon Heart.
** Hellstone, which you can only find in the underworld.
** Cobalt/Palladium, Mythril/Orichalcum, and Adamantite/Titanium are only available after defeating the Wall of Flesh and are used for endgame equipment. You'll only be able to get one of each pair in a given world, however.
** Hallowed metal, which can only be found as a drop from the three robotic bosses; there's not even a hallowed ore!
** Chlorophyte, which begins growing in the Underground Jungle during hardmode. It can become somewhat common as it grows by replacing nearby mud and jungle grass, but gathering it can still be a bit tricky thanks to the dangerous hardmode jungle enemies like giant tortoises and moss hornets.
** Shroomite and spectre bars, which can only be made by taking chlorophyte bars (which are already fairly hard to acquire, as mentioned above) and combining them with large numbers of glowing mushrooms and ectoplasm, respectively.
** Luminite, which is dropped by [[spoiler:the Moon Lord]] in the 1.3 Big Update.
* UselessUsefulSpell: Status effects are mostly not very effective. In the time it takes for the slow damage over time of the On Fire! or Poisoned debuffs to kill an enemy you could have already killed the enemy a hundred times over using regular weapon attacks. Averted in the case of the bosses though, as the extra damage status effects allow you to deal will definitely help.
* VariableTerminalVelocity: The slime mount has the property of doubling your falling speed, which immediately returns to normal if you unsummon it.
* VendorTrash: Of all the items in the game, only two items (both of which are fish) exist solely for selling for money: The common Neon Tetra, which sells for a rather low 15 silver, and the rare Golden Carp, which sells for a huge 10 gold.
* TheVeryDefinitelyFinalDungeon: As the game developed, these have popped up. First, it was the Underworld, then the ''entire world'' became this after the release of Hardmode. Later, it was the Lihzahrd Temple, which can only be unlocked by a key dropped by Plantera. So far, the hardest dungeon in the game is the post-Plantera Dungeon, which is chock-full of extremely dangerous [[DemBones skeletal enemies]].
* VictorGainsLosersPowers: Most of the equipment that Duke Fishron drops on defeat are based on his abilities.
* VideoGameCrueltyPotential:
** The Guide VoodooDoll will allow you to harm the guide. However, he respawns after you kill him.
** The only way to get one of the {{Nice Hat}}s is to kill off the Clothier. The Clothier Voodoo Doll (that can summon Skeletron for a rematch) is added in the 1.2 patch, as if that wasn't already enough encouragement.
** The Goodie Bags in the Halloween Update can yield ''Rotten Eggs'', a kind of consumable throwing weapon that can damage the [=NPCs=] if you aim at them (normally such friendly fire is impossible with regular weapons).
** Two words: Bunny Cannon. The tooltip even says "Killing bunnies is just plain cruel. Period."
* VideoGameCrueltyPunishment: The game is usually very tolerant of your evil ways, allowing you to slice bunnies and birds in half left and right. There's even a voodoo doll that lets you kill one of the [=NPC=]s at your will! [[spoiler:Throw that voodoo doll into lava, however, and you get attacked by the massive Wall Of Flesh. It will rip newer players apart, and there is literally no escape -- you HAVE to kill it or die to escape.]]
* VideogameFlamethrowersSuck: Averted with the flamethrower here. Not only does it pack a punch and causes damage over time due to setting enemies on fire, its range is quite nice and its ammo is hilariously easy to get. Those slimes hopping around? All that gel that is cramming your pockets and your chests? Yeah, that's what you use to fuel it. Slime statues rigged to timers can fill your entire inventory with gel just by going [=AFK=] a while. And the Frost Moon event gives you the chance to get the Elf Melter, which is essentially an upgraded flamethrower.
* VillainForgotToLevelGrind: The first round of bosses are a real challenge, particularly the Wall of Flesh. Once you reach Hardmode and acquire its dramatically more powerful gear, they'll come off like pushovers. For comparison, the final normal boss has 8000 hit points. The most fragile Hardmode boss has 28000 as of 1.2.4.1[[note]]Unless you count [[DualBoss The Twins]] separately, as one has 23000 and the other one has 20000.[[/note]]
* VoluntaryShapeshifting: You can use certain accessories to turn into a werewolf during a full moon, or a merman to swim better.
* VoodooDoll:
** The Guide Voodoo Doll, which will allow you to [[VideoGameCrueltyPotential harm the guide]]. However, he respawns after you kill him. If you throw it in lava while in the Underworld, it causes Wall Of Flesh to spawn in addition to killing the guide normally, which turns on hardmode for your world if defeated.
** There's also the Clothier Voodoo Doll, which lets you kill the Clothier, which summons Skeletron when done at night.
* VoodooShark: A Cloud in a Bottle allows you to DoubleJump. How? By creating a cloud as a platform to jump from. How that supports you is another question.
* WakeUpCallBoss:
** Skeletron will teach you the meaning of pain if you've gotten cocky tearing through the Eater of Worlds and the Eye of Cthulhu. The Wall of Flesh is another big step up, and then you get another ''big'' wake up call the first time you attempt any of the hardmode bosses.
** 1.2 added another boss like this: Plantera. While Plantera's 30,000 HP isn't particularly terrifying, it packs a major punch with its attacks. Most importantly, Plantera doesn't come to your custom arena, with the heart and star statues just a hop away; ''you'' come to Plantera, in the Underground Jungle. And don't even think of trying to [[BerserkButton lure it to the surface.]] That said, there's no rule stating you can't build an arena around where the bulbs are, provided you have the patience to build one...
** With the addition of 1.3's Expert Mode worlds, even the ''[[WarmupBoss Eye of Cthulhu]]'' itself becomes one, if only for being a taste of just how much more difficult the new AI is. That's not even getting into the aforementioned Hardmode bosses, a couple of whom can reliably OneHitKill you if you're still using your old non-Hardmode gear.
* WalkDontSwim:
** Without special accessories or equipment the character is limited to walking and jumping underwater.
** The [=NPCs=] are limited to this behaviour in water.
** Many of the monsters and other enemies who normally walk on land will behave this way in water.
** Subverted for the players with certain accessories or potions. You can walk on water with a Water Walking potion or with certain boots. Combine those boots with Obsidian and a Lava Charm and you can also walk on lava, in addition to being able to be immersed on lava without penalty for 7 seconds! A must for those tackling the Wall of Flesh.
* WalkOnWater: The Water Walking Potion temporarily grants this ability, and the Water Walking Boots grants it as long as they're equipped. The Lava Waders (crafted from the Water Walking Boots) will allow a player to safely walk on lava.
* WarmupBoss: The Eye of Cthulhu is usually the first boss the player will face (because it can spawn automatically when the player is strong enough) and fairly simple to beat with a good ranged weapon. Its attacks aren't all that strong, either, and dodging it is simple enough with a few levels of wood platforms.
* TheWarSequence: The Goblin Army, a hundred-strong army of goblins with varying professions. The number increases for every person playing when one strikes. To solidify the point that this is going to take a while, they drop weapons that actually help you in taking them down easily.
* WaveMotionGun:
** The [[FlyingSaucer Martian Saucer]] boss of the Martian Madness event has a giant laser it can fire downward. This laser is capable of taking huge chunks of health out of even the tankiest characters. When its cannons are destroyed, [[TurnsRed it does nothing but spam this laser]] until it's destroyed.
** The Martian Saucer can drop the Charged Blaster Cannon. It fires smaller, [[Franchise/MegaMan Mega Buster-like]] shots with a short charge, but if charged continuously for about three seconds, the cannon will fire a highly-damaging, infinitely piercing energy ray.
** [[spoiler: The [[FinalBoss Moon Lord]]]] fires one from its middle eye that sweeps in an angular motion and is ''incredibly'' painful. When its eyes are detached, they all can randomly use a smaller and slightly less painful version.
** Players can get their own in the form of the Last Prism, which fires six wide-angled beams that eventually converge into a large [[EverythingsBetterWithRainbows rainbow death laser]]. Its high power and attack rate make it one of the strongest magic weapons in the game.
* WeaponizedOffspring:
** The Eye of Cthulhu shoots out mini-eyes to attack the player as a sort of ranged attack.
** The Brain of Cthulhu shoots out flying eyeballs that serve as its first life bar.
** The Wall of Flesh shoots out burrowing worms that attack the player as well as the feeders that extend on cords to attack the player.
** Plantera sprouts vine attached attack mouths like the wall of flesh has in its second stage.
* WeBuyAnything: Merchants will gladly take anything you give them. Keep in mind however, some items have no value, so wouldn't even be worth keeping as VendorTrash, such as excessive dirt blocks. While you can get rid of unwanted items this way, you can also simply dump the items if you come across something more valuable along your adventuring.
* WeCanRebuildHim: The Eye of Cthulhu, the Eater of Worlds and Skeletron are 'rebuilt' into deadlier, cybernetic versions of themselves (the Twins, the Destroyer, and Skeletron Prime respectively) so that they can get their vengeance on you when you reach Hardmode.
* WhatTheHeckIsAnAglet: An Aglet is one of the available equippable items, providing a small speed boost when equipped. It's also an essential component for the Frostpark Boots.
* WhatTheHellPlayer: The Voodoo Dolls of the Clothier and the Guide have the description "You are a terrible person."
* WhenTreesAttack: The Splinterling and Mourning Wood enemies during the Pumpkin Moon (the latter of which spits flaming branches at you) and the Everscream during the Frost Moon (who shoots spikes instead of flaming branches).
* WhoopeeCushion: A whoopee cushion can be found as a joke item. It does nothing but produce funny noises.
* WideOpenSandbox: In a similar vein to ''Minecraft'', the game throws you in at the surface of a pristine wilderness and sends you off to do your thing.
* WillTheyOrWontThey: The Goblin Tinkerer and the Mechanic are constantly asking about each other, the Nurse is after the Arms Dealer, and the Arms Dealer is... [[ReallyGetsAround well]].... But nothing seems to come from any of it, except maybe the Nurse and the Arms Dealer who may or may not have gone out on a date.
* WingedHumanoid: Harpies. You can become one yourself by crafting and equipping wings.
* WithMyDyingBreathISummonYou: The Lunatic Cultist summons the four Celestial Towers when defeated.
* WombLevel: Implied by the art style and presence of flesh-themed items and enemies in the Crimson Biome. Can be taken further if you get your mitts on a rare drop in the Crimson and convert the Crimstone blocks into ''flesh'' blocks, which can be used to craft furniture made of flesh.
** The "pots" in the crimson look like strange growths and the various surface plants look like growths with eyeballs. The entire biome is very red themed in general.
** The boss of the Crimson is a giant brain EldritchAbomination summoned either by smashing three beating hearts or using a bloody spine item crafted at bloody altar using individual vertabrae dropped by enemies in the biome.
* WoodenStake: The stake launcher fires these. As one might expect, it has a huge damage bonus against vampires.
* {{Wormsign}}: Giant worms and other burrowing enemies leave a trail of little bits of dirt flying around as they're digging. They also have a very characteristic sound which can be somewhat unnerving if you can't easily defeat them yet. It does give a good indication of what side they'll be coming from next, though.
* WorthlessYellowRocks: Zig-zagged; gold ore and bars are valuable, but their monetary and crafting value is quickly surpassed by other materials, most of which are fantastical things like "Demonite." Gold ''bricks'' are completely worthless (shopkeepers won't pay for any type of bricks).
* WrenchWench: The Mechanic. A female character in a yellow mechanics jump suit with a large wrench on her back. She sells the player the various items used for using the wiring sytem in the game.
* {{Wutai}}: Furniture and buildings built out of the Dynasty Wood that the travelling merchant sells will have an Asian theme, allowing you to build your own Wutai base.
* XMeetsY: ''Franchise/{{Castlevania}}'' meets ''VideoGame/{{Minecraft}}'' meets any grindy RPG.
* TheXOfY: The ingame item: The Blade of Grass.
* YinYangBomb:
** You can explore the blighted, dark lands of TheCorruption and the joyful, light-aligned Hallow and find respectively Dark and Light Souls, which are used to make or upgrade dark or light-themed equipment. Fuse them with two particular (and rather rare) items and you obtain the Dao of Pow, an EpicFlail which is essentially a huge spiked Yin Yang on a chain capable of massive damage and confusing any enemy it touches.
** As of Terraria 1.2, Combining the [[InfinityMinusOneSword True Night's Edge and the True Excalibur]] at a Demon Altar will cause the power of TheCorruption and the [[LightIsNotGood The Hallow]] to cancel out and produce the [[InfinityPlusOneSword Terra Blade]].
* YouBastard: The descriptions for the Guide and Clothier Voodoo Dolls (which allows to player to harm them) are both "You are a terrible person."
* YouGottaHaveBlueHair: The game allows your character to have hair of almost any color (now including Flat Black, as of the 1.2 patch which changed the way coloring works). You also have the option to have [[AmazingTechnicolorPopulation unusual skin colors]].
* YourSoulIsMine: In Hardmode, souls start dropping from enemies near hallow or corrupt areas, as do the hardmode bosses. You need souls to craft the best stuff.
* YouWillNotEvadeMe:
** Getting too far away from King Slime or leaving him in a small space will make him teleport to you.
** Attempt to run away from the Wall of Flesh, and it'll give you a debuff called "The Tongue," which basically means it reels you back in for heavy contact damage. If a player attempts to warp back to spawn, the Wall of Flesh instakills them instead, accompanied by a special [[HaveANiceDeath death message]].
** Attempting to warp away from [[spoiler: the Moon Lord]] now makes him teleport right to your spot instead; though [[spoiler: the Moon Lord]] can be outrun, if the player gets too far, [[spoiler: the Moon Lord]] will teleport to them.
* ZergRush:
** A player can (sort of) create one by using a Battle Potion and Water Candle together during a Blood Moon. All three increase spawn rate and raise the limit of on-screen enemies.
** The Goblin Army event causes more than 100 goblins to spawn on both sides of you and all come after you. Have fun killing warriors from right and left while pelted with arrows and magic from afar. The Pirate Invasion and Martian Madness events are similar, except with gun-toting pirates and ray gun-wielding aliens respectively.
** In the alpha, the slimes had a high spawn rate and would swarm players while they tried to work making it difficult getting your shelter built. While the slime spawn rate has been toned down, this can still happen on blood moons with the zombies and demon eyes.
** In Hardmode, especially before you get decent equipment, a Blood Moon can become tougher than the normal mode bosses ever were, while the Solar Eclipse can feel like a horde of BossInMookClothing enemies.
** Snowmen too when you use the Snowglobe item.
** At the lower levels of the caves at the current version, it is nearly impossible to get a respite from the hordes of Skeletons, Giant Worms, and Mother Slimes.
** Then in the Underground Jungle you have Hornets which can spawn in swarms of up to 6. At one point the hornets had their health and attack damage balanced out but they remain damngerous en masse.
** Also have fun in the Underworld where Imps never stop spawning, throwing fireballs [[DepthPerplexion through walls]] at you while teleporting all over the place. Then come the [[DemonicSpider bone serpents]]. The spawn rate was mercifully toned down in a patch, but can still be tough at times, although you will no longer regularly have to deal with three simultaneous bone serpents.
** The Underworld includes flaming bats and demons, which will constantly swarm you if you're traveling the "safer" route by grappling along the ceiling.
** You can incite this by placing a water candle (held instead prior to 1.2.3) which can be found in great quantities in the dungeon. Though it only has a modest effect, it is still useful for attracting monsters to traps to farm their drops. A similar effect can be induced by consume a Battle Potion. For the record, both of these items' effects stack, so try to use both for maximum efficiency.
** Eaters of Souls and their variants in the Corruption spawn in massive numbers, sometimes up to a dozen at once, and charge the player relentlessly. Any low-level player wandering into that area is unlikely to get back out alive.
** The enemies in the dungeon never stop coming. Wizards attack you from random directions, skeleton warriors charge in more than six at a time, and flying skulls can shut off your ability to attack briefly. If that wasn't bad enough, their spawn rate increases as you reach lower and lower depths and if even THAT wasn't enough for you, they all have upgraded versions that appear after defeating Plantera along with OTHER new, unique hardmode dungeon enemies such as the VERY bulky Paladin and the extremely fast Bone Lee. You can tone this down a bit by stealing every water candle in sight, but the spawn rate is still higher than normal.
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->''[[TheStinger This is going to be a terrible night...]]''