* AnticlimaxBoss: While the Golem is a strong boss, it's disappointing for many players who see it as much easier than Plantera, the boss coming immediately before it.
** Demoted to BreatherBoss between Plantera and Duke Fishron as of version 1.2.4.
* SugarWiki/AwesomeMusic: [[AwesomeMusic/{{Terraria}} Has its own sub-page.]]
* BreatherBoss: The Golem. It does have some dangerous attacks and a lot of HP, but it's also fairly predictable and much easier to fight than Plantera, the boss you had to defeat just to reach the Golem. Also helps that it can't pass through blocks, meaning you can run into the hallway, rendering the Golem useless.
* BrokenBase:
** Terraria version 1.0.6 quickly became one of the most polarizing updates in it's history due to a few high caliber bugs that made it into the game.
** One of the more annoying changes is the inability to place anything in lava anymore, meaning that making tunnels to Hell are much harder to create now unless you exploit dropping sand into the lava or are really patient about using water to make obsidian walls or digging a reservoir to drain the magma into. Since mining Hellstone creates lava now, this makes Hellstone difficult to mine without lava-immunity potions or digging a reservoir below to carefully drain the magma into.
*** 1.2 however gave us boots that allowed the player to walk on water. If you somehow got your hands on Lava Charm and Obsidian, you could combine the the boots with Obsidian and then the resulting boots with the Lava Charm. That would give you not only the ability to walk on fire tiles and walk on lava surface, but also the ability to sink into the lava for 7 seconds. Equip a Lava Charm with these boots as well and you will be able to stay in the lava for fourteen seconds.
** The release of 1.0.6.1 corrected the bugs and fixed the fireblossom issue, but it got broken again when 1.1 made it so not even the sand trick worked anymore.
** The announcement marking the end of Terraria's development after one last bugfix has broken the base into those who think Terraria is ruined, those who just accept that all things come to an end ultimately, and those who believe that the real experience [[AndTheAdventureContinues has just begun]], and its time for {{Game Mod}}s to shine.
*** Subverted; more updates followed later on.
** When the announcement was made that XBLA and PSN versions of the game were being developed and that they would feature new content, the majority of the old PC crowd [[{{Understatement}} were not pleased]] to say the least, especially because this news was hyped up the day before after months of silence.
*** The console version. RuleOfCautiousEditingJudgment would be in effect.
** Medusas. Are they a cool and unique, [[DemonicSpiders if unusually dangerous]] enemy that forces you to switch up your strategy and adds a level of coolness to the game? Or an obnoxious {{Fake Difficult|y}} gimmick enemy that exists only to screw you over? The nerf they got in 1.3.0.4 calmed this argument slightly, but the medusas still have their share of haters.
* ComplacentGamingSyndrome:
** Pre-version 1.2.: It's rare to see people use anything other than the Minishark, Megashark, swords, and Crystal Storm.
** Post 1.2.: Vampire Knives, Shadowbeam Staff, and Spectre Armor with Spectre Hood are all but essential for endgame bosses. And then this is turned around against the Moon Lord- it gives a debuff that prevents the lifestealing effect from working.
** Hello, Solar Eruption. Put simply, this is a weapon that everybody, no matter their build, should consider getting in their inventory once they hit the end game. It's very affordable to craft, being made only from the drops of a lunar pillar and thus not requiring the final boss to get at, and so can very easily gotten by everybody. To put it simply, it's a melee weapon with crazy reach, hits enemies through walls, and is one of the most powerful weapons due to being made of end game material. Not only does it hit through walls, but it will also light up wherever it goes.
* DemonicSpiders:
** Bone Serpents found in the Underworld. You are surrounded by lots of lava (which kills you very fast), and they have lots of health.
** In the underground jungle, you have swarms of Hornets. They have 100 health and deal 40 damage per hit. 1.0.6 gave them a ranged attack. Hornets (and their big and little cousins) and Man Eaters found in the Underground Jungle. Hornets come in huge swarms, can shoot their stingers at you, and inflict poison. Man Eaters, meanwhile, are tougher versions of the Snatchers you find on the surface, and they're much more dangerous underground because you can't see them coming until they chomp you for 30+ damage.
*** The console version introduces Dragon Hornets, which are stronger than normal Hornets. Insultingly, they don't even have good drops, leaving only a pittance of copper coins.
** Clowns only appear on hardmode Blood Moons, and very rarely, but they are [[VideoGame/{{Minecraft}} this game's answer to Creepers]], throwing bombs that can destroy terrain. Thankfully, 1.2 changed it so that their bombs no longer destroy blocks. The bombs still hurt like hell though.
** Corruptors were this for those who like to make projects, as their spit used to corrupt terrain prior to the 1.2 patch. Corruptors are tougher versions of the Eater of Souls with a nasty ranged attack. Said ranged attack also corrupts terrain wherever it hits, helping the Corruption's already fast spread rate. They also have a small chance of inflicting the irritating Weakened debuff whenever they hit you.
** Unicorns, which are faster, tougher and more powerful than most monsters.
** Armored Skeletons in hardmode, which can inflict the Broken Armor debuff, which halves your armor rating for ''five minutes'' and turns even the weakest of Hardmode enemies into a serious threat. It's not that they're tough to beat. It's that they can inflict a ''five minute'' debuff that halves your armor rating.
*** Ichor Stickers, from the Hardmode underground crimson biome, for similar reasons. Their ichor debuff also reduces your defenses, in this case by 20 points. The good news is it only lasts 15 seconds, not 5 minutes. The bad news is that unlike Armored Skeletons, which have to physically touch you to apply their debuff, Ichor Stickers can apply theirs from extremely long range with their spit. [[ArsonMurderAndJaywalking Also its name doesn't really rhyme]], [[PainfulRhyme no matter what the developers might think]].
** Clingers in the underground Hardmode Corruption. They shoot cursed flames, can move through walls, and tend to be near each other. Made even worse if a Corruption spot has spawned under your house. Clingers, tougher versions of the Man Eaters that spawn in the Underground Corruption. They can reach through walls, spawn in huge clusters, and spit cursed flames that don't go out when you jump in water.
** Hornets and Man Eaters, found in the Underground Jungle. Hornets come in huge swarms, can shoot you from surprisingly long distances, and can poison you. Hornets are so dangerous, the game's wiki advises first-time players to wall themselves up whenever they see Hornets coming, and just kill them with the Vilethorn. Man Eaters, meanwhile, are basically a pair of mandibles on the end of a stick, and they can reach through walls to chomp you, leaving you helpless - and the Vilethorn does fuck all to hurt them.
** Voodoo Demons, which are basically Demons with slightly boosted HP and the Guide Voodoo Doll as a drop. If you aren't careful when you kill them, they might drop the doll into lava and summon the Wall of Flesh. It's not that they're particularly dangerous. It's that, when they die, they drop the Guide Voodoo Doll directly underneath them - and the Wall of Flesh doesn't distinguish between intentional sacrifices and accidental sacrifices.
** In Hardmode, a new type of demon called the Red Devil appears. They can fire 5-6 tridents that each deal '''massive''' damage [[note]](120-150+ even with Hallowed Armor)[[/note]]! Thankfully, they're rare and their tridents are slower than Demon Scythes.
** Giant Bats. They're everything bad about bats - fast, comes in huge swarms, hard to see, harder to hit - with insanely high attack power and a small chance of inflicting [[InterfaceScrew Confusion]]. Giant Bats are unusually dangerous for bat enemies. Despite the name, they're only slightly larger than the smaller varieties and just as fast, so hitting them with anything other than melee is difficult at best. They also have surprisingly high damage output unless you're wearing Adamantite or Hallowed armor, which you won't be for most of the time you're exploring the caverns. Even worse, they inflict Confusion, which reverses your controls and has led to many a death from accidentally walking into lava.
** Literal spiders. One type occuring in the crimson which have high health and attack. Another variety spawns in caves among masses of respawning webs and tend to attack in large numbers. Both varities are very dangerous to early game players. In hardmode, the Wall Creepers get replaced by the ''even worse'' Black Recluses, which deal very huge damage AND inflict Venom, which drains your health much faster than Poison.
** Can't forget the Nymphs. At a distance, all you see is a Lost Girl. But when you get close, they flip out and chase after you! [[Left4Dead Sound familiar?]] Of course, after falling for it the first time, [[GenreSavvy the player can shoot the Nymph from a distance]] [[SubvertedTrope for easy damage.]]
** Necromancers in the Dungeon that appear during Hardmode. As soon as they take damage, they [[TeleportSpam teleport]] and shoot highly damaging [[BeamSpam beams.]] The catch? The beams bounce off walls and are incredibly fast, making it incredibly hard to dodge and avoid being damaged. As if that's not enough, the beams have a chance of inflict a slowing debuff.
*** Their counterparts, Diabolists and Ragged Casters, aren't much easier to handle. Diabolists also teleport like crazy, but they shoot explosive magical projectiles with huge area of effect explosions. Ragged Casters fire rapid-fire magical projectiles that inflict the Blackout debuff, which is like Darkness but worse.
** Skeleton Snipers can deal out tremendous damage from incredibly long range. Even worse, they tend to blend in with the mobs of other skeletons.
** Spiked Slimes. Spiked Jungle Slimes have incredible accuracy, powerful attacks, and are harder to see than Hornets. Spiked Ice Slimes lack the range of their tropical cousins, but they have crazy high rates of fire and can inflict the Chilled and Frozen debuffs.
** Pigrons turn invisible and fly through walls. While their damage is fairly negligible, they're nearly impossible to see until they hit you.
** The console version introduced a lot of these, with many of them being reskins of previous enemies with boosted stats. Examples include Dragon Hornets, Arch Demons, Orcas, and ''Arch Wyverns''.
** Arapaimas, in the Hardmode Underground Jungle. No real tricks about them - they're just faster than you and really, really powerful. If you fall in the water and get swarmed, you're not getting out.
** Moss Hornets are a pain to deal with in hardmode underground jungle. Their ranged attacks come out ''very fast'' and hit rather hard, particularly to a player who doesn't have upgraded hardmode armor yet, can travel through water, and can poison you. They generally have impeccable aim as well, so get used to jumping around a lot to throw them off. Melee oriented players without a decent ranged weapon will also have difficulty with them due to their tendency to fly away from you if you try to get close to them. They also like to attack you in groups and are extremely common.
** Chaos Elementals are incredibly fast and can teleport at will, including directly on top of you.
** Rune Wizards. They have some of the most powerful attacks in the game, and their projectiles can pass through solid blocks.
** Sharks are fast, take off huge chunks of health with every bite, and can take some serious punishment. However, they're only found in the oceans, so you pretty much have to be trying to encounter them.
** Goblin Sorcerers don't pose much threat to a prepared player, but they are excellent at killing your friendly [=NPCs=] by either teleporting into their rooms or hitting them with their projectiles. Lord Helix help you if you don't have the Vilethorn.
** The reason why one shouldn't spawn a surface Mushroom Biome before Hardmode (unless they're well equipped) is because the Mooks there have loads of health and deal very high damage. Special mention goes to the Mushi Ladybug, which hurts ''much'' more than the other foes there, moves very fast, has very high knockback resistance, and can fly for short distances.
*** The Giant Fungi Bulb is a constant threat in hardmode Mushroom Biomes. It behaves similarly to the Man-Eater, only it will also shoot spores that float erratically, deal a lot of damage, and can pass through solid objects. Because of these menaces, it's a good idea to bring something like the Death Sickle or Nettle Burst if you're wanting to explore Mushroom Biomes.
** [[CreepyCentipedes Crawltipedes]] when fighting the Solar Pillar. They deal huge CollisionDamage, and like [[Franchise/TheLegendOfZelda Moldorm]], their [[AttackTheTail only weak spot]] is the small glowing ball in their tail. Thankfully, they only attack airborne players, but if you ''do get in the air'', they will chase you down like a homing missile on crack, dealing an incredible amount of constant CollisionDamage. Furthermore, it's not easy keeping grounded when [[GoddamnedBats Corites, Srollers, and Selenians]] are rolling all over the ground.
*** The solar biome in general is pretty rough for anyone. In addition to "no going airborne", there are monster's who can ''reflect your projectiles'' back at you, and there are no major visual clues as to them having done so until you take the hit. Each pillar tries to make its respective type (Ranged/guns, magic, melee, summon) the easiest style to use against it, but the solar one is the only one that outright ''punishes'' you for trying anything other than its respective strategy (melee).
** Medusas in the marble biomes. IF they catch you in their line of sight, they can use an attack that will turn you to stone, and if that happens, you're a sitting duck for about three seconds. Finally, as if that weren't enough, if you happen to get knocked off a ledge while paralyzed, fall damage is amplified to the point of likely killing you instantly. Also, said falling damage is NOT prevented by a Lucky Horseshoe. Thankfully the attack can be avoided by not facing the Medusa when the attack hits.
** Mothron of the Solar Eclipse. Sure, it's rare, but this miniboss-level enemy hits hard, and is the sole Solar Eclipse enemy that can fly through blocks in a manner like Queen Bee (instead of "floating" through them like the Wraith/Reaper), meaning that it's no longer safe to barricade yourself in, even in a wraith/reaper-proof house.
* FandomRivalry: With ''VideoGame/{{Minecraft}}'', and to a lesser extent, ''VideoGame/{{Starbound}}'', due to both games having similar elements.
* FridgeLogic: Bones can drop from Skeleton warriors in the dungeon, but not the random skeletons you find underground. Justified for game balance; bones themselves are a decent ranged weapon, and they can be made into Necro Armor, which is a ranged-based set of armor that increases damage and reduces ammo consumption.
** Which may be explained by the skeleton's appearance. Its bones are green, and probably worn away from underground [[BuffySpeak dampness or something]].
* GameBreaker: Enough to [[GameBreaker/{{Terraria}} warrant its very own page.]]
* GoddamnedBats: As you get better gear, previously challenging monsters stop being so dangerous but due to the fact you get knocked back if you suffer so much as a single damage, they can easily become this. Even after you have a full set of molten armor you can still be killed by a lowly slime slapping you into a pit of lava. That is, unless you have a Cobalt/Obsidian/Ankh/Paladin's Shield to prevent knockback, in which case they go from a minor threat to practically nothing.
** ''Any'' enemy if you're trying to manage your items or craft something, especially worms. Even if they don't do much damage, they'll knock you around (and away from your crafting table) until you leave your inventory to kill them.
** Want to get your hands on some Meteorite? You'd better have the patience of a saint, since Meteor Heads will be constantly harassing you as you try to pick it up.
** The game has literal bats, but most of these (save the ones in Hardmode that confuse you) are fairly tame. The actual GoddamnedBats are spellcasters -- monsters that teleport at will to anywhere nearby, and can shoot their projectiles through the wall and love teleporting to places you can't reach without tons of digging. Thankfully, most projectiles can be swung at with a melee weapon or tool to get rid of before it hits you, but ''still''. Wizard enemies, which teleport through walls and shoot projectiles at you (which also pass through walls). They're tough enough to take a few hits to kill, and they love to appear behind walls so you can't immediately kill them. Thankfully, their projectiles can be destroyed by melee attacks.
*** Fire Imps, the underworld variant, are even worse. The underworld is at least 75 percent lava at surface level, and all the good hellstone deposits require digging through the towers spaced between the lakes. This means the Imps often appear in out-of-reach places. They can and will show up when you're busy fighting Bone Serpents or mining. Ah, and unless you take preventative measures to have flooded the area with water, or obtained the Obsidian Skull, you'll also be busy avoiding lava puddles and molten hot ore. [[SarcasmMode Have fun]]! Fortunately, the spawn rate of the underworld was toned down in a subsequent patch, although fire imps are still a pain if they start lobbing fireballs from an inaccessible location. Trying to mine Hellstone in The Underworld is especially annoying when Fire Imps keep pestering you every 5 seconds, especially when there's lava everywhere. Once you actually close the distance with one of these bastards, they die quickly and easily and tend to just stand there while you smack it to death. The only problem is that another one will spawn in just a few seconds....
** There are actual bats in the game and they're just as annoying as you might expect. Their hit-box is a mere one block, making them ridiculously hard to hit with ranged combat, they do upwards of 20 damage per hit if you're not in high tier armor, which you likely will be when you first see them, and they like to swarm. In Expert, they're ''even more annoying''- getting hit by them can give you the Feral Bite debuff, which increases your damage, lowers your regeneration... and also periodically gives random smaller debuffs on you.
** Harpies. Flying enemies that appear at high altitudes and use a high damage projectile feather attack that shoots out multiple projectiles.
** A variety of bat in the game is the Hellbat being the worst of the bunch. While not particularly annoying by themselves, they can overtake beginner players quickly.
*** Then in 1.1 they added the Giant Bats, which are tougher and do more damage than the Hellbats. Oh, and they can also confuse the player, potentially making you walk yourself into lava or a crowd of Skeleton Archers. Or more Giant Bats.
** Speaking of skeleton archers, they're annoying as heck too. The hit you from a long way away, do hefty damage, and can set you on fire.
** A more potent example are the Lava Slimes in the Underworld. They jump far and fast and literally leap off of lava like a spring. They also used to turn into lava when killed, and in Expert Mode, they actually do so.
** After the newest patch introduced the Big Eaters and Little Eaters, it appears the number of Eater of Souls and its variants have skyrocketed. People have seen as many as 15 at once.
** Gastropods shoot pink lasers from off screen with ridiculous speed and accuracy and deal massive damage for a common mob. Plus, they tend to gang up on you.
** Chaos Elementals run like crazy, charging you and teleporting all over the place.
** For a new player or someone setting out with a new character, Flying Fish are difficult to deal with due to their numbers.
** The Lunar Event is ''chock-full of them''. Most of them also have a great amount of health, requiring the strongest weapons to bring down.
*** Nebula Pillar: Brain Sucklers appear in huge numbers and fly straight at you, even through walls. When they hit you, they latch onto your head and greatly obscure your vision and deal a good amount of continuous damage. Nebula Floaters fly around, fire painful projectiles, have a good amount of health and teleport when hit.
*** Stardust Pillar: Star Cells are {{Asteroids Monster}}s that, when killed, their smaller remains have the ability to grow back into a larger one, which means more smaller cells for you to kill. Milkyway Weavers can pass through walls and can appear in numbers.
*** Solar Pillar: Corites, Srollers, and Selenians. All three appear in numbers, the first performs a homing fireball tackle that deals good damage and passes through walls, the second and third perform a rolling attack that doesn't pass through walls or home in, but hurts even more, and the Selenian's rolling attack ''[[SpinToDeflectStuff deflects projectiles]] [[AttackReflector back to you]]''. And if one attempts to avoid them by flying... the [[DemonicSpiders Crawltipedes]] are there to [[AntiAir make sure you]] ''[[AntiAir don't]]''.
*** Vortex Pillar: Storm Divers can fly around, and fire a very painful shotgun attack that can be tricky to avoid. Thankfully it's easy to hide from them behind terrain and use a penetrating weapon to beat them. Alien Queens spit a projectile that causes the Distorted status, causing the player to float about uncontrollably. Finally, Alien Hornets can sometimes be spawned right on top of you by the pillar for cheap CollisionDamage.
* GoddamnedBoss: A number of bosses like to alternate between floating out of melee range and ramming the player to death, requiring the player to keep a projectile weapon and stay out of these bosses' range.
** If you ''do'' have a Warmth Potion and sufficient armor, then the Ice Queen of the Frost Moon turns into this. She flies around the area very quickly, making it ''very irritating'' to get a good hit on her. Furthermore, she has lots of health, so expect her dodging and flying around to prolong the fight. However, her attacks won't deal that much damage due to the Warmth Potion weakening them. ''Without'' a Warmth Potion or sufficient armor, she becomes ThatOneBoss.
** The Lunatic Cultist. He liberally uses TeleportSpam and uses DoppelgangerAttack while floating around and casting annoying-to-avoid spells. Being human-sized, he also has a very small hitbox for a boss. Thankfully, he doesn't move whenever he's casting, as well as the fact that he holds a particular weakness to [[HomingProjectile chlorophyte bullets.]]
* GoodBadBugs:
** Examples which are still "at large":
*** Fluid dynamics are completely broken, allowing you to create automated generators that create unlimited amounts of lava and water out of thin air, which in turn allows you to mine unlimited amounts of obsidian, which you can then turn into an unlimited number of obsidian skulls, which you can then sell for an unlimited amount of money. Basically, once you obtain a bucket of lava, your wealth is only limited by your patience.
*** Minimizing the program in a certain way causes it to run ridiculously fast in the background. This is handy if you want to park somewhere safe and wait for nightfall/daybreak, or if you've set up an automated monster-farming trap and want to wait for a bunch of RandomDrops.
*** The differences between water and air pressure is ignored, so you can dive 300 meters underwater, dig a small tunnel, then dig up a bit into a roomy cavern, and the cavern will not get wet at all (to get the idea, imagine a J-shaped test tube that can fill all the way up on the right side without the left side overflowing).
*** During the Blood Moon, zombies can bash doors open, but only inward. Putting something that occupies the space but doesn't have collision (a cloth banner or another door, open in the opposite direction, for example) will make the door impossible to open inward, meaning that you can come and go freely but the zombies won't get in. It should be noted, however, that goblins don't have this problem as they bash doors ''completely off the hinges''.
*** With [[{{MenuTimeLockout}} autopause]] turned on, you can swing your sword and pause in the middle of the animation to click a potion up from your inventory, unpausing will consume it, ''even if you have the Potion Sickness debuff that would have prevented you from consuming it in the first place''.
*** Light Discs, the Dao of Pow, and the Shadowbeam Staff, if used in just the right way, can actually glitch through one-block-thick walls.
*** After the 1.2 Big Update, it is possible for worldgen to create a Lizhard Temple in the Jungle with a messed-up layout that allows you entry into the Temple without having defeated Plantera and getting the Temple Key to unlock the door.
*** After the 1.3 Big Update, it is possible for worldgen to accidentally generate a Granite or Marble Cave mini-biome that overlaps part of the Lizhard Temple, similarly allowing you to break sequence and enter it long before beating Plantera.
*** An interesting and much-exploited collision detection/clipping/zipping bug that was introduced by the sloped blocks in the 1.2 Big Update has been dubbed the [[http://www.terrariaonline.com/threads/hoik-guide-rapid-player-npc-etc-transport-using-only-sloped-tiles.160618/ "HOIK"]]. Yrimir has demonstrated this bug by [[https://www.youtube.com/watch?v=iHw06h2L-rc slaying the Dungeon Guardian]] with a HOIK setup that allowed him to attack it with impunity while zipping around it in a circle.
*** The Lihzahrd altar can spawn directly below a low ceiling on world generation, which completely immobilizes the Golem's main body when summoned by the fact that the golem spawns directly above the altar and main body cannot move through rocks. Assuming you can still get a clear shot at the body in this state and damage it, the fight becomes laughably easy since it eliminates much of the need to dodge the main body's attacks, allowing you to pick off the body parts at your own pace.
** Examples which have been "fixed":
*** Prior to 1.1.1, trying to place a recorded music box on a table would duplicate the item by a massive amount, these boxes sell for two gold ''each''.
*** Like all bosses the Eater of Worlds flees if he kills the player and there are no other players nearby to challenge him. Prior to 1.0.6 the Eater of Worlds was considered ''slain'' when he fled complete with full drops, allowing you to run back to the battlefield and collect its loot.
*** Early after the 1.2 Big Update, canny players were able to use Actuators to force Lizhard Bricks into the background, allowing access to the Lizhard Temple without beating Plantera and getting the Temple Key. This was soon fixed. Likewise, they used to be able to use a Teleporter to bypass the door. Both of these were 'fixed' by making it so that Teleporters and Actuators could not work in the Lizhard Temple biome ''until'' you defeat Plantera.
*** Version 1.2.4 added some amusingly overpowered acceleration mechanics with the Minecart's physics, allowing players to accelerate their carts to such an insane velocity that they can either get sent flying thousands of blocks away, accidentally get noclipped through terrain blocks out to the middle of nowhere, or sometimes even deal thousands of points of damage to any enemies or bosses their minecarts run through when blazing away at such ludricous speeds. This bug has been fixed as of 1.2.4.1, much to the disappointment of a number of players who were exploiting this trick.
* JunkRare:
** Played straight with the Enchanted Sword, a rare sword with the ability to fire damaging energy beams with each swing. It is one of the most rare items in the entire game. The game has a small chance of spawning the Enchanted Sword somewhere underground when you first generate a world. There is no indication that the sword has spawned and since it's in a random spot underground you could potentially spend a thousand hours in a world with an Enchanted Sword and never know it's there. In the off chance that you do somehow manage to find an Enchanted Sword you realize that... it's terrible. It has only one point of damage more than the Light's Bane, a low tier weapon. The ability to fire energy beams isn't even all that special, even pre-Hardmode. The Ice Blade, another pre-Hardmode weapon, does the same thing, is almost as damaging, and is far easier to acquire.
*** To be fair, when one takes into account the Enchanted Sword's auto-swing and energy beams, it is possibly the best pre-hardmode melee weapon available, but it's easily outclassed by everything after the Wall of Flesh.
** {{Exaggerated|Trope}} with the Slime Staff. It has the lowest drop rate of any enemy-dropped item: only a 1 in 10,000 chance, and even Pinky only has a 1% chance to drop it. This makes it potentially the rarest of any of the summon weapons... it's also the ''weakest'' of all the summons, with a mere 8 damage and no ranged ability.
* MoralEventHorizon: The Player Character. In order to progress to the endgame, you must summon a boss in the Underworld, and in order to do so, you must murder the Guide with the Guide Voodoo Doll. As of 1.1, it's clear that death is not cheap for the non player character allies, as when they die they are not resurrected, but rather replaced, and thus this amounts to murdering the Guide simply to progress in the game.
** Unless of course, [[TheScrappy you hate the Guide]] which [[{{TakeThatScrappy}} leads to...]]
* NauseaFuel: [[EvilIsVisceral The Crimson]]. From the sound Blood Crawlers make when struck to the UncannyValley Face Monsters and the disturbing music, the biome is {{Squick}} embodied.
* PainfulRhyme: The enemy Ichor Sticker was clearly given its name because the developers thought it rhymed. It doesn't. Ichor is pronounced with a long I sound followed by an "oo" sound ("eye-kor"), and sounds nothing like the word "sticker."
* PraisingShowsYouDontWatch: The game had a community like this pre-release, with many people praising the game well before it came out and claiming it to be nothing like ''VideoGame/{{Minecraft}}'', despite only a limited number of them having played it at that point.
* RescuedFromTheScrappyHeap: Surprisingly enough, the [[InfinityPlusOneSword Terra Blade]]. Even though it had extremely high power and {{Sword Beam}}s, many people considered it a letdown for the effort needed to create it and consider it inferior to the Death Sickle, Paladin's Hammer, Horseman's Blade and Vampire Knives due to its lack of auto-swing. Cue Version 1.2.4, it got the auto-swing it deserved, and it's now back as a contender for best melee weapon in the game.
* TheScrappy:
** The NPC known as "Guide" who appears in every world upon creation, runs around and will move into any house you build. He's supposed to give tips to new players, but [[StopHelpingMe there's no way to get rid of him]]; even if he dies, he respawns within a minute. But the worst of all is that he often [[TooDumbToLive opens your house's front doors during night when there's zombies outside]], so it makes them able to enter your house and kill you. Even the creators themselves find him incredibly annoying: they walled him in and trapped him in their LetsPlay (which doesn't help anyway because he can teleport). Redigit even added an item called the [[TakeThatScrappy Guide Voodoo Doll]], [[spoiler:[[VideogameCrueltyPunishment which summons The Wall of Flesh if thrown into the lava pits of the Underworld.]]]]
*** Since 1.0.5, he has become much more useful as he can show you everything you can craft with an item if you show it to him. Crafting is no longer a guessing game, and it certainly makes the world a whole lot kinder to new players who try to experience the game without immediately resorting to a wiki.
*** Lampshaded in the Steam card for him. "He thought it would be funny to open your door and let zombies in, you thought it would be fun to feed his soul to the lord of eternal nightmares."
** As of 1.2.4, The Guide's Scrappy-ness is quickly being eclipsed by The Angler, who is the only child character in the game...which is a title he tarnishes by being an utterly infuriating SpoiledBrat. He's bossy and demanding, he treats your character like dirt, and is constantly pulling "pranks" on the other residents, such as putting undead fish into their furniture and piranha teeth into chairs. And you can only do [[ScrappyMechanic one of his fishing quests per day]], which is especially aggravating when you're trying to get the rarer rewards which have an already infuriatingly low drop rate. Even worse for those who want to give him the same treatment as The Guide, InfantImmortality is in full effect. If he is ever reduced to 0, [[NoSell he simply poofs away in a puff of smoke, with the chat log " Has left."]]
* ScrappyMechanic: Potion Sickness: whenever you use any item that heals your health, you need to wait a minute before you can use another. There's an accessory that can reduce it to 45 seconds.
** Occasionally it will start to rain in the overworld, with each storm lasting about 24 minutes. This wouldn't be so bad if storms didn't darken the brightness a bit, caused flying fish to spawn (basically [[GoddamnedBats demon eyes]] that can appear during the day.), and sometimes drag on if you're unlucky, with a storm coming up right after the previous one. Though it causes Waterleaves to bloom and drop their respective seeds and it drastically increases fishing power and it also causes Ice Golems to appear in the snow biome on hardmode but oddly enough, it also nullifies the new conditions for Fireblossoms to bloom and drop seeds, they bloom between 3:45 P.M. to 7:30 P.M. but not while it rains.
* ScrappyWeapon: Nobody uses short swords. Rather than swinging it overhead in an arc, your character thrusts it forward, making it almost useless against anything that doesn't walk right into it.
* {{Squick}}: The Wall of Flesh, a gigantic... wall of flesh, with flunkies in the form of tiny mouths hanging off of veins that try to attack you. It can ''puke leeches'' to attack you with.
** The Crimson is one big land of Squick. Blood drips from ''everything'', even the trees. The enemies there have names like "[[http://terraria.gamepedia.com/Blood_Crawler Blood Crawler]]" (a giant tick/spider), and [[http://terraria.gamepedia.com/Floaty_Gross "Floaty Gross"]] (a ghost that constantly drips...some sort of unpleasant fluid), and you can farm things like Flesh Blocks (to build flesh furniture, of course), Vertebrae, and Meat Grinders.
* StopHelpingMe:
** The guide NPC who functions as a newbie hint guide. Unfortunately, he likes to path around the players and can enter their normally safe houses, bringing the monsters howling at the doors inside with him. [=NPCs=] running from monsters who have gotten into their homes can also run to your house and open the door that kept them out.
** The baby slime summoned from the rare slime staff. It has GameplayAllyImmortality and hits rather fast and can kill weaker enemies quickly. Unfortunately it can also negate your attacks due to the MercyInvincibility the mobs have while being pummeled by the slime, thus your attacks don't always register. During hardmode, it quickly becomes obsolete due to its low attack power, and the higher defense hardmode monsters have. By that point you'll probably be better off killing things on your own rather than rely on the slime.
** Some summons in general can end up being this, especially the fast attacking ones like the Stardust Dragon. They can constantly trigger enemies' and bosses' MercyInvincibility which will leave you no room to get any hits in for yourself, which in turn can drastically lower your damage.
* ThatOneAchievement:
** The "Knight in Shining Armors" achievement on the console version. To get it, you have to obtain the ultra-rare Mining Armor, craft every helmet for the Harmode armors, get every other piece of armor, beat Ocram up to 30 times, then make 3 full sets of Hallowed Armor, plus 3 more of each Hardmode armor, and get a few hundred bars of Adamantite (the rarest ore in the game.)
** "Supreme Helper Minion" on the PC version. Better hope you have the patience of a saint, as this requires you to complete ''200'' angler fishing quests. And since [[ScrappyMechanic only one quest can be done per in-game day]], this will involve ''lots and lots'' of waiting.
* ThatOneBoss: Skeletron Prime if you're trying to beat him solo. He has four arms, each of which can do a fair amount of damage, and his head gains defense when it spins instead of losing it like the last version did. His high health and arms will soak up damage to near the end of the night, and if you don't beat him by then he becomes practically unbeatable and gets a OneHitKO attack.
** Wall of Flesh. If you don't prepare yourself in a ridiculous manner before the fight, you will have a LOT of trouble. Plus, the Hungry make ranged weapons a problem to use (unless you use Meteor Bullets or Unholy Arrows), and his incredible health pool and BeamSpam makes him a nightmare, possibly even worse than the above. NO strategy will assure success against that freaking wall. Which makes coming back with Hallowed Armor, the Megashark, Crystal Bullets, and Excalibur (or, heaven forbid the [[InfinityPlusOneSword Terra Blade]],) for round 2 (or whatever number fight it is) all the more satisfying.
*** Another reason why Wall Of Flesh is far more of a pain in the ass to fight than other bosses is the fact that he's by far the buggiest: he can spawn facing the wrong way which means that you either get grabbed by his tentacles right away and take a good chunk of damage without being able to prevent it, or if you try to maximize the area you fight him in by summoning him near the edge of the world, die instantly due to the Wall reaching the edge of the world right away. He can also spawn much further down than he's supposed to, making the world-spanning bridge you're basically required to build if you don't want to spend 90% of the fight swimming in lava or jumping over pits and structures useless. There's reason why the characters' page says there's no middle ground - you're either overprepared or dead.
** How about The Twins? Sure, they don't seem so bad at first, until you get them down to half health. Spazmatism starts shooting a stream of cursed flames and trying to eat you, while Retinazer steps up the EyeBeams to BeamSpam levels.
** Plantera is also really hard the first time fighting her. She has a ton of HP, and can shoot petals and spiked balls that do a lot more damage. Once you get her down to half health, she goes berserk and causes even more damage and goes even faster. And don't even ''think'' of going to the overworld jungle to get the advantage- [[https://youtu.be/6AgX3jsrTQY She absolutely hates it.]]
** The Pumpkin Moon. It starts out simple, with [[TheGoomba Scarecrows]], [[MightyGlacier Splinterlings]], and [[LightningBruiser Hellhounds]] that can be fairly easily handled with good crowd control weapons. Then you hit wave 4 and the [[WhenTreesAttack Mourning Wood]] shows up. It's got 12,000 HP, it fires a huge spray of fire that sticks around on the ground for a few seconds and does huge damage, and it's surprisingly fast. It only gets worse from there.
** The Frost Moon. It's [[UpToEleven The Pumpkin Moon Taken to Eleven]] The first few enemies like [[TheGoomba Zombie Elves]] and Gingerbread men, can be handled with ease with Pumpkin Moon loot, then you hit Wave 4 and the Everscreams come out with 13000 HP, being a harder version of the Mourning Wood. Later, you have to fight [[BadSanta Santa-NK1]] Which fire very powerful missiles and presents, that has 18000 HP. Even later, from waves 12 onwards you fight the IceQueen with 34000 HP, which is pretty much Pumpking on crack, flying everywhere, firing ice shards. It gets hectic really fast, good luck getting past wave 12 on your own. To put it? Some people consider the Ice Queen to be ''tougher'' than Duke Fishron (see below).
** Duke Fishron introduced in 1.2.4 version. [[LightningBruiser He's extremely fast, powerful and has 50,000 HP to boot]], fighting him in a small-medium sized arena is downright suicidal as he will create huge tornadoes that not shoots high-speed, high damaging sharks in a very fast rate, but will also limit the player's movements. Think it can't get any worse? It TurnsRed when low on HP becoming even faster, 1.5x as painful, and more erratic. In 1.3, he got buffed even further- he will get pissed and now ''repeatedly'' use his fast charging attack if he leaves the ocean. Yes, that includes flying too high into space, which means the "arena" you can fight him in is rather small!
** The Destroyer has become notorious as the most difficult of the three mech bosses, ever since it got buffed. It was briefly nerfed in 1.2 reducing its defence, damage, and health, but then 1.2.3 came along and reversed the nerf big time, raising its stats even higher than they were before. Additionally, there's less healing for you during the fight (since probes now only drop hearts 33% of the time instead of 100%) and it's completely immune to all debuffs!
* ThatOneLevel: The Underground Jungle. It's a humongous cavern that stretches from below the Jungle to the Underworld. What's so hard about it? It's a nightmare to navigate, it's swarming with Hornets and Man Eaters (horrendous DemonicSpiders), and it's got several rare and rather useful items hidden in it. (Enable hardmode in 1.2 and its difficulty is boosted to BonusLevelOfHell.)
** The post-Plantera Dungeon, by and far. Originally it's dangerous but survivable and by the time you reach hardmode and have high end equipment it's basically a BreatherLevel. Then you defeat Plantera and the crap hits the fan. Suddenly the Dungeon is filled with extremely powerful skeletons that can soak damage like nothing, Necromancers that can bounce nigh-instantaneous shadow bolts around corners to hit you and teleport away whenever they take damage, Diabolists that shoot exploding, un-blockable fireballs through walls at you and also teleport on damage, Paladins that have more health than some bosses and rapidly throw hammers at your face for massive damage, Skeleton Snipers that can two-shot you from across a room. Basically every enemy in the post-Plantera Dungeon is either a DemonicSpider or a {{Goddamned Bat|s}} designed to distract you while the stronger enemies kill you. Even after you kill them you're still not safe because there's a chance every enemy you kill might spawn a Dungeon Spirit which charges you at high speed, straight through walls! The good news is that if you can survive this onslaught you can get some of the most powerful equipment in the game here.
* UglyCute: The Eater of Worlds and the Brain of Cthulhu have drops that allow you to get a pet baby Eater and baby Face Monster respectively. Despite being based off their NightmareFuel counterparts, their miniature size makes them look somewhat cute.
* WhatDoYouMeanItsForKids: 1.2 introduces the Crimson. In a T-rated game.
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