Characters / Terraria

Given the loads of NPCs, monsters, and bosses. It's no doubt that there's a character list for this game. This page also Needs Wiki Magic Love.

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    The Player 

The player character starts off with nothing but a shortsword, pickaxe, and axe. (If you bought the Collector's Edition, you also get a carrot which you can use to summon a pet bunny.) Over the course of the game they will explore the world, build a home, find treasures, defeat ever more challenging foes, and eventually, plunge the world into a battle between the ancient spirits of light and dark.
  • The Ace: Architect, engineer, tactician, warrior, mage, technician, electrician, inventor, alchemist, savior, destroyer. The PC is all these things and more. There is no weapon they cannot wield, no metal they cannot forge, no creature they cannot slay, no power they cannot control, and no challenge they cannot conquer.
  • Anti-Hero: Regardless of the decisions they make, the player does a few very questionable things during their journey, like murdering the Clothier and Guide with their respective voodoo dolls to draw the bosses connected to them out of hiding.
  • Clothes Make the Superman: The large majority of the player's power resides in the clothing and accessories that they wear. Often, these items are enchanted to bestow perks in addition to their function (for example, "Armored" Rocket Boots increase your defence as well as their normal function of allowing you to fly).
  • Celestial Body: They can acquire this with the hardmode-exclusive Twilight dyes.
  • Curb-Stomp Battle: As the player becomes more powerful, they will start becoming able to steamroll enemies that previously put up a good fight. By the time you unlock Hardmode, you could be one-hit-killing many regular enemies.
  • Did You Just Punch Out Cthulhu?: Many of the bosses the player character fights are Eldritch Abominations — in some cases, they are literally parts of Cthulhu himself. By the end of the game, he/she beats the Moon Lord, the brother of Cthulhu and the closest it gets to the real deal himself.
  • The Gardener: Can be a Mundane Gardener who grows a variety of plants both magical and mundane.
  • Heroic Mime: The player character has no dialogue, but communicates with NPCs just fine.
  • He Who Fights Monsters: Eventually after punching out many a Eldritch Abomination, the amount of sheer power that the character gains effectively makes them one themselves.
  • Humanoid Abomination: An end game character is both much more durable than the average mortal and fully capable of wielding weapons and magics that are nearly cosmic in scope. They can have minions made of star matter, armor forged solar energy and other worldly metals, weapons that summon falling meteors with every swing, ect. Very little about how the player fights is at all human in the end and a battle involving a high tier player can look outright terrifying from an outside perspective. On a side-note, the more stranger dyes can also turn you into one visually as well, if you wish to complete the image.
  • Instant Expert: No matter what weapon/item s/he gets their hands on, they are able to wield it flawlessly. Be it swords, bows, guns, magic spells of untold power, yoyos...
  • Kleptomaniac Hero: You can take everything. Literally everything. Found an underground cabin? You can loot any treasure chests that are in it. Then take the chest. Then steal all the light fittings. Then disassemble the walls and take those too.
  • Nice Job Breaking It, Hero!: By killing the Wall of Flesh, the player turns a slightly corrupted world into one threatened to be overrun by huge, competing, pockets of Hallow and Corruption or Crimson.
  • One-Man Army: The player will kill thousands of enemies over the course of a full game. The game awards the player with banners for every 50th kill of a particular enemy, and the player can also obtain a Tally Counter which tells them exactly how many enemies of each type they have killed. In some of the special events, such as the Goblin Invasion, they actually do take on entire armies single-handedly.
  • Person of Mass Destruction: The amount of devastation you can wreak is cataclysmic. It also doesn't help that your weapons tend to be stuff along the lines of Wave-Motion Prisms , rapid-fire rocket launchers or swords that literally pull stars from the heavens and send them crashing onto your enemy.
  • Villain Protagonist: In order to progress past a certain point, in this game that averts Death is Cheap when it comes to the NPCs, they need to summon, then kill, an Eldritch Abomination by sacrificing the current guide. Although how they feel about this depends on how they view the guide and his frustrating quirks.
  • Was Once a Man: The player starts out perfectly baseline mortal, although as time goes on and they start both gathering all sorts of energies and weaponry, they eventually become an unnatural Physical God.
  • You Gotta Have Blue Hair: The player character can have any hair color, and the random character generator will happily give you blue, pink, or any color of hair.

Non-Player Characters

     As a Whole 
All NPCs can move into a player's town if they have, a room with light, a large item (such as a table, dresser, bookshelf, etc.) and a comfort item (such as a chair, bench, bed, etc.), a door and some criteria specific to the NPC.
  • Action Girl: Each and every one of the female NPCs can defend themselves when push comes to shove.
  • Action Survivor: Most of them are relatively normal people with normal jobs- unfortunately, being 'normal' isn't enough to protect you in the Death World that is Terraria.
  • Badass Crew: They can all participate in combat, and can easily become this if enough are gathered in one place.
  • Damsel in Distress/Distressed Dude: The Goblin Tinkerer, Stylist, Mechanic and Wizard are all initially found tied up in one place or another, and must be freed to be recruited.
  • Dungeon Shop: They can live anywhere that isn't the Corruption or Crimson, as long as it fits the requirements for a house—including underground, producing this trope.
  • Idle Animation: Are prone to these when the PC isn't interacting with them. This includes talking to and playing games with fellow NPCs and sitting on nearby chairs.
  • Improbable Weapon User: Most of the NPC's whose functions aren't directly related to combat tend to be this. Examples include the Nurse and her needles, the Party Girl's Confetti Guns, and the Truffle's spores.
  • Love Dodecahedron: The Nurse likes the Arms Dealer. The Arms Dealer reciprocates, but is also not above flirting with the Dryad and Mechanic, neither of which like him back. The Mechanic, meanwhile, has a mutual attraction with the Goblin Tinkerer, but neither of them is willing to voice it.
  • Took a Level in Badass:
    • A meta-example: prior to the 1.3 release, the NPCs were defenseless against enemies and reliant on the player to deal with any attackers. The 1.3 update armed them and made them ready to fight anything that invades the town.
    • And more straightforwardly: once you reach Hardmode, the NPCs all switch to more powerful weapons, and can utterly decimate even (pre-Hardmode) bosses without breaking a sweat.

    The Guide 
http://static.tvtropes.org/pmwiki/pub/images/guide_l_4.png
They say there is a person who will tell you how to survive in this land... oh wait. That's me.
The first NPC, who you start out with in every world. As befits his name he guides you with tips of varying levels of helpfulness, and if you show him any material item he can tell you what can be crafted from it.
  • Badass Normal: The most "average" of the NPCs and besides having a vast amount of insight he's seemingly normal, yet can still hold a fight along with the rest of them when pushed enough times.
  • Guide Dang It: His purpose is to avert this for new players: if you give him a crafting material, he can tell you everything you can make with it and the crafting recipe itself (although not where to craft it, exactly). He will also tell you the next possible objectives towards progression (atleast until the later portions of Hardmode).
  • The Generic Guy: Besides his knowledge, he's just a normal guy.
  • The Scrappy: Invoked. He originally got hate from the beginning for appearing in every world, being unkillable, and subject to mass Artificial Stupidity. At this point he's somewhat become the Scrappy in-game, with other NPCs occasionally making comments about how much they're annoyed with his antics.
  • Shaped Like Itself: As shown in the caption quote, one of the first tips you receive from the Guide is that there is a Guide, although he quickly realizes how redundant this information is.
  • The Smart Guy: Both of the booksmart and Street Smart variety.
  • Smug Super: See the caption quote. Now remember this is the same guy who holds every single bit of knowledge of the world of Terraria.
  • The Straight and Arrow Path: Uses a simple Wooden Bow to defend himself if forced into combat. Come Hardmode, he upgrades to flaming arrows.
  • Voodoo Doll: You can find his in the clutch of Demons flying about in the Underworld. Equipping it allows the player to attack the Guide even though NPCs are normally immune to player attacks, and tossing it into lava instantly kills him. However, a doll incinerated in the Underworld (whether tossed by a player or simply dropped by a killed Demon and not caught) will summon the Wall of Flesh.

    Merchant 
http://static.tvtropes.org/pmwiki/pub/images/merchant_l_3.png
Did you say gold? I'll take that off of ya.
As the player amasses more money, the Merchant will appear to relieve them of that burdensome cash. He sells mostly general use items, some potions, and spare tools in case the player loses theirs and lacks the materials to make more.
  • Bunny-Ears Lawyer: Lies that he doesn't periodically sell junk and believes the moon is made out of cheese yet is essential early on, all the while keeping to his promise that his prices aren't high as they could be.
  • Crutch Character: The wares he sells are useful in the early game, but by the time Hardmode comes around just about all of them have been surpassed in function or usefulness.
  • Honest John's Dealership: Judging by his dialog. He's constantly trying to foist off items of dubious usefulness like "perfectly ventilated armor". Despite his claims of not being a junk dealer, he's tried to sell useless angel statues to other NPCs, and he sells dirt blocks for exorbitant prices on the international market.
  • Knife Nut: If forced into combat, he will defend himself with throwing knives.

    Nurse 
http://static.tvtropes.org/pmwiki/pub/images/nurse_l_7.png
Would you like a lollipop?
The nurse will move in once a player has found a heart crystal to expand their maximum health above the starting 100. For a price, she can restore the player back to full health in an instant, and remove any debuffs.
  • All Periods Are PMS: All of the female characters get really nasty during a Blood Moon, which the devs have confirmed is a joking reference to periods. The Nurse is no exception, as her lines become various levels of bitchy, either accusing the player of being a hypochondriac or complaining that they dare to get injured.
  • Amusing Injuries: Several of her lines has her casually mentioning re-attached body parts or other grievous wounds.
  • Combat Medic: Will heal herself or other wounded NPCs after attacked, and when not helping her allies stay alive she'll be fighting off enemies with poisoned needles.
  • Dr. Jerk: She tends to become a bit sarcastic, especially when the player wants her to heal them at high health. Approach her on the brink of death, and she'll quickly lose this attitude.
  • Healing Shiv: She also throws needles at the NPCs to heal them, and will occasionally use them to heal herself. She throws poisoned needles at enemies instead.
  • Hello, Nurse!
  • Tsundere: The Nurse can come off as this: Some of her quotes suggest a Team Mom mentality, others that she only sticks around because you pay her.
  • Turn Your Head and Cough: One of the random quotes when you talk to her, even if your character is female.

    Demolitionist 
http://static.tvtropes.org/pmwiki/pub/images/demolitionist_l.png
NO SMOKING IN HERE!!!
A dwarf who moves in after you find grenades/dynamite or craft sticky bombs and can sell you more of them and with many other explosive products.
  • Ax-Crazy: This guy is a little too fond of explosive tumult.
  • Grenade Spam: Defends himself through the use of Grenades.
  • Leaning on the Fourth Wall: If you talk to him, he may ask you to sign a "Griefing Waiver".
  • Our Dwarves Are All the Same: He has many of the stereotypical dwarf's traits. He is significantly shorter than other NPCs and has a beard. Furthermore, his mining helmet, lantern, and the fact that he sells Explosives fits the trope of dwarves preferring underground environments.
  • The Rival: To the Arms Dealer.
  • Stuff Blowing Up: His speciality.
  • Your Answer to Everything: Got a problem, any problem? Easy — blow it up.

    Dye Trader 
http://static.tvtropes.org/pmwiki/pub/images/dye_trader_l.png
I bring you the richest colors in exchange for your riches!
A trader and purveyor of dyes, who wears a colorful Arabian-styled outfit. He sells the Dye Vat, which allows the player to start making their own dyes from natural resources. If you bring him particularly exotic plants, he will trade them for special, magical dyes.
  • Color-Coded Multiplayer: In a multiplayer server, he sells Team Dye that changes the color of the armor/clothing that it's applied to the respective color of the team if you are on one.
  • Sinister Scimitar: The weapon he uses to fight is explicitly called "Exotic Scimitar"

    Dryad 
http://static.tvtropes.org/pmwiki/pub/images/dryad_l.png
The sands of time are flowing. And well, you are not aging very gracefully.
A centuries-old Nature Spirit, who will move in if you have defeated one of the regular pre-Hardmode bosses. She sells various natural items like acorns and seeds, and she can tell how corrupt the world has become (and will rebuke you for it).
  • A Day in the Limelight: She becomes a playable character in Dungeon Defenders 2.
  • All Periods Are PMS: During the blood moon but not as bad as the Nurse and Mechanic.
  • Garden Garment: She's clad in naught but vines and leaves. Players can buy it during Halloween and wear it themselves.
  • Green Thumb: Nearly everything she sells has something to do with growing vegetation or altering nature. When monsters are nearby, she'll cast a barrier of leaves that buffs up the defense nearby players and NPCs, increases their life regeneration, and gives them the Thorns ability. The more bosses you defeat, the more powerful the barrier gets against enemies.
  • Ms. Fanservice: Not entirely visible in game, save for a risqué painting of her that can appear in the dungeon, but definitely in most fanart.
  • Nice Girl: She's one of the kinder NPCs in the game (when it's not a Blood Moon), passionate about the wellbeing of her neighbors and the environment and one of the few people who is on good terms with the Truffle.
  • Our Fairies are Different: Being a dryad, she's a fey creature associated with plantlife and happens to be one of the few fairies in the game who has a humanoid shape.
  • Really 700 Years Old: "I wish [Arms Dealer] would stop flirting with me. Doesn't he realize I'm 500 years old?"
  • Shout-Out: "The sands of time are flowing, and you are not aging gracefully."
    • Another reference is one of her possibles names being "Celestia".
  • Stripperiffic: Those vines don't cover a lot of skin.
  • Status Buff: When threatened, she will generate an aura that boosts all nearby NP Cs and Players by increasing their defense and regen, while giving them a permanent Thorns effect. On enemies, however, the aura burns them for a small amount of Damage Over Time.
  • Well-Intentioned Extremist: She encourages the player character to make the world a Crapsaccharine World by spreading the Hallow, although as of 1.3 she'll praise the player even more for completely purifying the world.
  • You Gotta Have Blue Hair: Her hair is grass green and done up in a long, curling braid.

    Arms Dealer 
http://static.tvtropes.org/pmwiki/pub/images/arms_dealer_l.png
Hey, this ain't a movie, pal. Ammo is extra.
He moves in after you find a gun. He sells guns and bullets, and will also sell you illegal gun parts if you catch him at the right time.
  • Arms Dealer: Of the Gun Shop Owner type. He can sell you illegal parts, however.
  • Blood Knight: He loves the sheer amount of enemies he has the chance to kill during Blood Moons. After all, it's much more fun that trying to hold a conversation with his neighbors while the event lends most of them their own Jerkass Ball.
  • Casanova Wannabe: He has a tendency to flirt with the ladies. The Dryad is sick of him doing so with her due to the massive age difference, the Mechanic already has a crush on the Goblin Tinkerer and is completely oblivious to his innuendo-laden jokes, and he may occasionally mention that he's preparing for a date with the Nurse or say that he's into what she's selling.
  • Covert Pervert: If the Halloween event is any indication, he's not above having spare of the Nurse's clothes lying around and selling them.
  • Double Entendre: He may mention that he "wants what the Nurse is selling" and the Mechanic may mention that he's asked her if he could press her pressure plates.
  • The Gunslinger: Wields either a Flintlock Pistol pre-hardmode, or a Minishark post-hardmode.
  • Kinetic Weapons Are Just Better: Notice how he only sells weapons and ammo that are kinetic?
  • More Dakka: The guy loves his firearms. He also sells the infamous Minishark, which can then be upgraded into the extremely fast-firing Megashark.
  • The Rival: To the Demolitionist.
  • Shotguns Are Just Better: He sells them in hardmode.
  • You Do NOT Want To Know: It's best he didn't answer HOW he made the Minishark, even stating this trope's name in a conversation with the player.

    Tavernkeep 
http://static.tvtropes.org/pmwiki/pub/images/tavernkeep.png
They say you're strong, well, I know strong. Let's see if you measure up.
A new NPC introduced in 1.3.4, unique in that most of the items he sells can only be bought using Defender Medals. He sells the items required to summon the Old One's Army, as well as several weapons useful for completing the event.

    Painter 
http://static.tvtropes.org/pmwiki/pub/images/painter_l_5.png
No, no, no... There's TONS of different grays! Don't get me started...
He's a painter, dressed in a red cap and white overalls. He sells everything you need to paint your world, as well as a number of decorative paintings, particularly landscapes.

    Angler 
http://static.tvtropes.org/pmwiki/pub/images/angler_l.png
I don't have a mommy or a daddy, but I have a lot of fish! It's close enough!
The only child NPC, who can first be found sleeping out on the ocean. He gives out rewards in exchange for finding special, rare fish.
  • Bratty Half-Pint: He's possibly the most annoying character in the game. At times he even refers to the player as an errand boy.
  • Conveniently an Orphan: He may occasionally mention that he's parentless, which partially justifies why he can be found in the middle of nowhere in the Crapsaccharine World that is this game.
  • Infant Immortality: 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 "[name] has left" when his health runs out.
  • Jerkass: This kid has nary a redeeming feature. He's an egotist who actively pulls cruel pranks on his neighbors and views the player as nothing more than a personal slave.
  • Knife Nut: Throws Frost Daggerfish to fight.
  • Small Name, Big Ego: Everyone else in his eyes are his underlings, despite the fact that unlike him they're all adults with a myriad of useful skills and wares.
  • Spoiled Brat: He frequently screams that he wants the daily quest fish immediately.

    Stylist 
http://static.tvtropes.org/pmwiki/pub/images/stylist_l.png
For you I think we'll do something... low maintenance.
A new NPC introduced in 1.2.3 that is found inside a spider nest, bounded by webs and can be freed. She can change your hair style. She also sells various hair dyes.
  • Ax-Crazy: Downplayed Trope as she's only this on blood moons. The other female NPCs only go as far as telling you not to bug them. This one? She will threaten to go Sweeney Todd on you with her styling tools if you don't leave her alone.
  • All Periods Are PMS: During the Blood Moon, which the devs have confirmed is a joking reference to periods, she threatens you with her scissors and razor.
  • Color-Coded Multiplayer: In multiplayer servers, she sells Team Hair Dye that makes the player's hair change colors depending on what team they're on.
  • Diegetic Interface: Many of her hair dyes can be used as Dead Space-style indicators such as life, mana, depth, biome, team, time, etc.
  • Hairstyle Malfunction: Possibly. Upon her death, her head and hair split into two different chunks, unlike other long-haired NPCs. What little hair is attached to her head is a spiky, misshapen mess, and it might not all be that surprising given how she might complain of her hair being loaded with spider web when you rescue her.
  • The Fashionista: She's all about the freshest hair styles, defends herself with Stylish Scissors and has got a nice dress and pair of high heels.
  • Shear Menace: Uses Stylish Scissors when forced to fight monsters.
  • Serious Business: Bad hair days. She may mention a disastrous attempt to dye her hair using some of the Dye Trader's stock or comfort the player if they supposedly have an awful hair problem.

    Goblin Tinkerer 
http://static.tvtropes.org/pmwiki/pub/images/goblin_tinkerer_l.png
Hey, does your hat need a motor? I think I have a motor that would fit exactly in that hat.
After the player repels the first Goblin Invasion, the Goblin Tinkerer can be found underground. He is an invaluable asset to any player, for he can reforge the player's items to make them more powerful; he also sells a couple of items that are extremely useful in the mid-game (Rocket Boots for flying, and the Tinkerer's Workshop for combining items).

    Witch Doctor 
http://static.tvtropes.org/pmwiki/pub/images/witch_doctor_l.png
The heart of magic is nature. The nature of hearts is magic.
The Witch Doctor moves in after defeating the Queen Bee. She/He sells the imbuing station and various tribal-themed accessories and items.
  • Ambiguous Gender: None of the NPCs' conversations mention his gender at all and his mask obscures his facial features. The only way one can find out on their own is to mess around with King and Queen Statues; these statues can be used to teleport random NPCs of the corresponding gender.
  • Blow Gun: His Weapon of Choice.
  • Lizard Folk: Word of God has offhandedly said that the witch Doctor is a lihzahrd. More info 
  • Witch Doctor: It's in the title, after all.

    Clothier 
http://static.tvtropes.org/pmwiki/pub/images/clothier_l.png
Of course embroidery is hard! If it wasn't hard, no one would do it! That's what makes it great.
Formerly a slave of Skeletron who could be found wandering outside of the dungeon, he moves in once his master has been slain, selling clothes.
  • Bad Powers, Good People: From 1.3 onward, he will fend off invading monsters by launching magical skulls at them.
  • Back from the Dead: Summoning Skeletron undoubtably kills him, as the process of Skeletron emerging tears him apart from the inside out, but he appears later perfectly fine and with only very vague hints as to how he came back.
  • Dark Is Not Evil: Going by his means of self-defense and the fact Skeletron bursts out of his corpse if you personally kill him at night, the Clothier still has some connection to Skeletron even without his curse. However, he's just another friendly NPC who never harms the player or the other NPCs on his own, and none the items he sells have any application in combat either.
  • Demonic Possession: Considering he has Red Eyes, Take Warning before he's set free as well as the fact that Skeletron bursts out of him, it's heavily implied that this is the case with him.
  • Earn Your Happy Ending: He's extremely grateful towards the player for freeing him from Skeletron's control.
  • Ludicrous Gibs: He violently explodes into Skeletron if you ask him about the curse if he hasn't been freed yet.
  • One-Winged Angel: If it's night time and he hasn't been freed, talking to him and agreeing to fight Skeletron will result in the beast bloodily ripping itself out of him and tossing his dismembered body aside to fight you. He can also do this after he's been freed when you kill him with the clothier voodoo doll, although considering all he's been through it makes the player look like more of a dick.
  • Shout-Out: Nearly every line he says is a reference to a Tom Hanks movie.
  • Spell Book: Uses the Book of Skulls to attack monsters. In hardmode, he begins using a special version that also inflicts the Shadowflame debuff on enemies.
  • Video Game Cruelty Potential: If you want to obtain his hat, you need to get him killed, and if you want to challenge Skeletron again you need to kill him yourself while you are equipped with his voodoo doll at night.
  • Voodoo Doll: Now dropped by Skeletons in the dungeon, in-case you aren't bothered to build an elaborate lava trap to get his hat. Killing him this way will summon Skeletron again if it's night.

    Mechanic 
http://static.tvtropes.org/pmwiki/pub/images/mechanic_l.png
Oh, you know what this house needs? More blinking lights.
Like the goblin, she's also bound, and found in the dungeon. She sells wires and wiring tools.
  • All Periods Are PMS: During the blood moon.
  • Blind Without 'Em: If you talk to her shortly after rescuing her, she may mention that she's dropped her contact lens and is desperately looking for it.
  • Distressed Damsel: While he was still cursed the Clothier tied her up and tossed her into the dungeon, and the player has to save her before she moves in.
  • Interspecies Romance: She's a human, and has a crush on the Goblin Tinkerer.
  • Oblivious to Love: She doesn't understand the Arms Dealer's comments about "pushing her pressure plate". On the other hand, she appears to have a mutual crush on the Goblin Tinkerer.
  • Ship Tease: She's always asking about the goblin tinkerer.
  • Will They or Won't They?: Towards the Tinkerer.
  • Wrench Wench: She even throws boomerang-like wrenches in self defense.

    Party Girl 
http://static.tvtropes.org/pmwiki/pub/images/party_girl_l.png
We have to talk. It's... it's about parties.
The party girl moves if you have at least 14 NPCs living in houses, with a 2.5% chance of doing so each day while the population remains at or above that number. She sells party supplies, including fireworks.
  • All Periods Are PMS: She's the only female NPC that averts this during the Blood Moon.
  • Genki Girl: Just like the pony she's based off, most of the thoughts running through her mind are about fun and parties.
  • Improbable Weapon User: Uses Confetti Guns and Happy Grenades in self-defense.
  • Joke Item: All of her items have no real significance for actual combat or other tasks but just there to, well, party.
  • Lethal Joke Item: The Fireworks she sells in Hardmode can kill enemies and even bosses, and the Confetti she sells can be combined with empty casings from the Arms Dealer to make Confetti Ammunition, which is more powerful than all pre-Hard Mode ammunition.
  • Rose-Haired Sweetie: She's cheerful and optimistic and loves parties, and she's the only female NPC who doesn't become rude or grouchy during a Blood Moon.
  • Shout-Out: She is a very blatant shout out to Pinkie Pie, she has blue eyes, dark pink hair, a love for parties, etc. And she can have names such as Sparkle and Trixie.
  • Where the Hell Is Springfield?: According to her, the world of Terraria is somewhere on Earth - she mentions that she's been to Sweden.

    Wizard 
http://static.tvtropes.org/pmwiki/pub/images/wizard_l.png
I make a rather enchanting hot chocolate if you'd be inter... No? Ok.
Once the world is in hardmode, he can appear underground, bound. He sells the materials to make a variety of magical weapons.

    Tax Collector 
http://static.tvtropes.org/pmwiki/pub/images/tax_collector_l.png
You already managed to spend every pence I paid you!? Bah, I'm not a charity, go kill a slime!
The Tax Collector moves in after you sprinkle a Tortured Soul, found in the Underworld in Hardmode, with Purification Powder. Every in-game minute (a second in real time), he will collect 50 copper from each NPC that is living in a house up to a limit of 10 gold.
  • And I Must Scream: He's trapped in the underworld until you decide to free him.
  • Cane Fu: Uses his Classy Cane to fight.
  • Heel–Face Turn: He goes from a hostile monster down in the underworld to a recruit-able NPC if you have some purification powder handy.
  • The Scrooge: He's based off of this, right down to the personality.
  • Ungrateful Bastard: He's created by purifying his Tortured Soul. Anybody would think that would give him a more kinder demeanour in his new lease on life, but sadly, that is not the case.
    • Then again, the taxes he collects go straight to you, so he's not entirely ungrateful. He also has a few lines where he isn't so sour about giving you his money.
    • Because he's immediately changed into a new character when you purify him and only has his standard dialogue (same as he uses when he's in your town), he can't even acknowledge that you just saved him. (This is unlike other NPCs that you save such as the Mechanic and the Goblin Tinkerer, who do have appropriate lines for thanking you.)

    Truffle 
http://static.tvtropes.org/pmwiki/pub/images/truffle_l.png
You haven't seen any pigs around here have you? My brother lost his leg to one.
The Truffle will only move into a house within a surface mushroom biome during hardmode and cannot be moved anywhere outside of it. He sells mushroom stuff.
  • Blade on a Stick: He sells Mushroom Spears.
  • Drone Deployer: Of a sort. He creates explosive spores that hover in the air when threatened.
  • The Friend Nobody Likes: He's at odds with everyone but the Dryad. The Clothier and the Witch Doctor have even gone as far as to try eating him.
  • Mushroom Man: All of his possible names are kinds of mushrooms or toadstools to boot, too. He'll also release spores as a means to attack enemies.
  • Shout-Out: He doesn't know the "Truffle Shuffle", so stop asking.
  • What the Hell, Player?: He calls you out for "stealing his children."

    Pirate 
http://static.tvtropes.org/pmwiki/pub/images/pirate_l.png
I'm no landlubber, but it's better to have lubbed and lost than never to have lubbed at all.
The pirate moves in after defeating the Pirate Invasion and sells cannons primarily, and some other things.
  • Cool Gun: A minigun with a cannon strapped to it. Extremely effective for self defense.
  • Defeat Equals Friendship: He looks and fights exactly like the Pirate Captain enemy, which may imply he elected to join the winning side after you trounced his invasion.
  • Pirate Parrot: Which you can buy as a pet, but it requires him in the ocean and costs two platinum coins. The Cyborg also implies the Pirate has one of his own after exclaiming how corrosive its droppings are to him.
  • Talk Like a Pirate: His manner of speaking.

    Steampunker 
http://static.tvtropes.org/pmwiki/pub/images/steampunker_l.png
I like your... gear. Does it come in brass?
The Steampunker moves in if you have beaten at least one hardmode boss. She sells a variety of high-tech, Steam Punk gizmos.
  • All Periods Are PMS: During a Blood Moon. Notably, she only has one Blood Moon-exclusive quote warning the player that she's feeling peevish; aside from that, her dialogue is the same as always.
  • Cool Gun: Wields a Clockwork Assault Rifle to defend herself.
  • Sky Pirates: She may mention that she's beginning to consider becoming one.
  • Steam Punk
  • Wrench Wench: This girl is extremely tech savvy, building and selling some of the most high end machinery in the game like jetpacks and teleporters; occasionally expressing curiosity about the workings of the Cyborg.

    Cyborg 
http://static.tvtropes.org/pmwiki/pub/images/cyborg_l.png
Sometimes I come off a bit... Get it? A bit?
The cyborg will move in once you have defeated Plantera and collected a rocket launcher. He sells rockets.

    Santa Claus 
http://static.tvtropes.org/pmwiki/pub/images/santa_claus_l.png
What? You thought I wasn't real?
He will only move in if 1: It's around December 15th to 31st and 2: If you summon, and defeat the Frost Legion. He sells a variety of Christmas-themed decorative items, including christmas trees and trimmings.
  • Abnormal Ammo: The Snowball Cannon.
  • And Your Reward Is Clothes: Oh, and some decorative items too for beating the Frost Legion.
  • Holiday Mode: Santa only appears during December 15th to 31st, promptly dying in the usual gorey explosion as soon as the new year hits.

    Traveling Merchant 
http://static.tvtropes.org/pmwiki/pub/images/traveling_merchant_l.png
Hmm, you look like you could use an Angel Statue! They slice, and dice, and make everything nice!
An NPC introduced in 1.2.3 that has a random chance of spawning every day once the player has at least two NPCs moved in and no other daytime events are occurring (goblin invasion, pirate invasion, eclipse). Unlike other NPCs, he does not move into a home and instead wanders around near where your home is. He carries a random list of goods each time he appears.
  • Badass Cape: He can sell one of four possible vanity capes.
  • Booze-Based Buff: Sake sometimes shows up which grants the tipsy (de)buff for twice as long as ale.
  • Energy Bow: After defeating Plantera, one of the possible items that can be purchased is the Pulse Bow. He also uses it to shoot down enemies.
  • Katanas Are Just Better: One of the possible items that can be bought.
  • Killer Yo-Yo: Has a random chance of selling One Drop's Code 1 yo-yo or the Code 2 when in hardmode, he can also sell two of the counterweights that the Skeleton Merchant does not.
  • Revolvers Are Just Better: A possible item he can sell after a Shadow Orb or Crimson Heart has been smashed.
  • The Gunslinger: Attacks enemies with his Revolver when threatened pre-hardmode.
  • Nice Hat: Wears a blue hat with a feather in it, which he sometimes drops when killed.
  • The Straight and Arrow Path: When Hardmode comes along, he switches out his Revolver for a Pulse Bow to attack enemies with.

    Skeleton Merchant 
http://static.tvtropes.org/pmwiki/pub/images/skeleton_merchant_l.png
You would not believe some of the things people throw at me... Wanna buy some of it?
Introduced in 1.3, the Skeleton Merchant has a random chance of spawning underground. Like the Traveling Merchant, he will not move into a home and will wander around the caverns. He carries a list of goods dependent on current time and moonphase.
  • Ballistic Bone: He throws bones at enemies when threatened.
  • Cruel and Unusual Death: One of his lines implies that he died by being caught by underground spiders, and they feasted on him until there was nothing left except bones. Oh, and he remembers it completely.
  • Dem Bones: He's a skeleton, albeit a friendly one.
  • Glove Slap: During a Hardmode Blood Moon, he carries a glove on a stick, while its damage and critical chance is mediocre at best, it has the single highest base knockback of any weapon beyond the Breaker Blade and is great for repelling enemies not entirely immune to knockback.
  • Killer Yo-Yo: He can sell the various yo-yo Counterweights that send out a tiny, orbiting counterweight upon attacking an enemy and during Hardmode, he not only can sell two unique yo-yos but also the Yoyo Glove that allows the equivalent of Dual Wielding two of the same yo-yo at once.
  • Nice Hat: Wears a large black hat.
  • Shout-Out: Several of his names are shout outs to other skeleton or advertiser characters.

    Critters 
Critters spawn in certain environments and are completely harmless and all of them can be caught using the bug net sold by the Merchant and put into bottles or Terrariums. These include birds, cardinals, blue jays, ducks, mallards, bunnies, squirrels, fireflies, butterflies, goldfish, worms, grasshoppers, mice, snails, scorpions, black scorpions, penguins, frogs, lightning bugs, glowing snails and truffle worms. The truffle worm is used for summoning Duke Fishron.
  • Animalistic Abomination: The Corrupted forms of penguins, goldfish, and bunnies. Considering that the Corruption has a reputation for spawning minor Eldritch Abominations, this comes part and parcel. Their crimtane versions in Crimson worlds are even worse.
  • Bunnies for Cuteness: Bunnies spawn at random and you can even catch one to put into a terrarium to keep. Although they become less cute during Blood Moons.
  • Everything's Better with Penguins: In the snow biome, unless it's a Blood Moon then you should run...
  • Gold Makes Everything Shiny: 1.3 brought about gold versions of all critters, which are very rare and worth 10 gold coins each. If they're bait critters then they have 50% bait power.
  • Metal Slime: Truffle worms, they burrow away the moment you get too close and spawn rarely. 1.3 introduces gold variants of various critters.
  • One-Hit-Point Wonder: Although they actually have 5 HP, they have zero defence and literally any attack will instantly kill them unless it was a weak starting weapon such as the Wooden Hammer.
  • Tailfin Walking: When it rains, goldfish shuffle about on land on their tails.

Bosses

    King Slime 
http://static.tvtropes.org/pmwiki/pub/images/king_slime.PNG
"The lord of all things slimy."
King Slime is a Giant Slime with a crown. It is a side boss that can be fought at any time but doesn't count for progression of the first act of Pre-Hardmode.
  • And Your Reward Is Clothes: You beat it? Enjoy your random part(s) of the ninja costume and possibly the boss mask. Not so bad since 1.2.4 as it now drops the Slime Hook, the Slime Gun and a Slimy Saddle that you can get a Slime mount. Then 1.3 improves the drops even more by making the Ninja costume into functional armor that improves Throwing weapons.
  • Asteroids Monster: It will eschew normal slimes from itself as it takes damage.
  • Cool Crown: Now wears one after the 1.3 update, making it look very similar to King Slime from Dragon Quest.
  • Flunky Boss: Spawns blue slimes as it takes damage. On Expert, it can also spawn spiked blue slimes.
  • King Mook: Basically a bigger, stronger version of the blue Slime. After the 1.3 update he even has a crown, and also appears as the boss of a Slime Rain.
  • Shout-Out: To Ninja Gaiden with the ninja floating inside it, being a reference to a boss of the same one you fight.
  • Shows Damage: It gets smaller as its health gets lower. Justified as it starts losing mass as it takes damage, as shown by the blue slimes it releases when taking enough damage.
  • Skippable Boss: It's entirely possible to never fight this boss. The triggering events are avoidable and it isn't tied to game progression.
  • Spike Shooter: Not King Slime itself, but the Spiked Blue Slimes it spawns on Expert can fire spikes at the player.
  • Teleportation: Will now dissolve and reform on the player if it happens to get stuck or manages to escape it for a while, so it cannot be trapped or outran anymore.
  • Time-Limit Boss: One of the very few bosses in the game that doesn't do this.

    The Eye of Cthulhu 
http://static.tvtropes.org/pmwiki/pub/images/eye_of_cthulhu.PNG
"You feel an evil presence watching you..."
Cthulhu's disembodied eyeball. It's very likely to be the first boss fought, unless players set sight on the weaker King Slime first.
  • The Berserker: Adopts this strategy as it's Expert Mode-exclusive desperation attack.
  • Early Bird Boss: After the player has satisfied a few relatively easy-to-meet conditions, the Eye of Cthulhu may simply decide to show up one night and start attacking, even if it hasn't been summoned. While it's still within reason to defeat it, it's also just as likely that the player lacks the equipment or skill necessary to fend it off.
  • Eldritch Abomination: Well, at least the eye of one.
  • Flunky Boss: For the first phase, it shoots weaker and smaller Demon Eyes called Servants of Cthulhu at you.
  • Giant Eye of Doom: The first major Lovecraftian horror most players with find themselves against, and once it loses enough health it ditches its iris for a horrifying and toothy mouth. With its speedy charge, it can easily outmatch an unprepared player.
  • Time-Limit Boss: It will run away if you do not defeat it by dawn.
  • Turns Red: Once at half health, it spins in a circle, releasing a small swarm of Demon Eyes and gaining a giant mouth where its iris was. In this state, it no longer shoots Demon Eyes but charges more aggressively. The 1.3 Big Update adds a new attack to the Eye's arsenal in Expert Mode, granting it a powerful and even faster berserker charge that it uses in proportion to how much damage it's taken.
  • Wake-Up Call Boss: For those who faced the King Slime earlier than anticipated.
    • It also serves this role in Expert Mode, demonstrating that bosses have become much stronger than they were in normal mode. Its movement is upgraded to nearly match The Twins' ability to track the player's position, it releases a large swarm of lesser eyes transitioning into its second phase, and the new Desperation Attack it uses makes it extremely difficult for early-game characters to both hit and dodge the Eye of Cthulhu when it's on its last legs.

    The Eater of Worlds 
http://static.tvtropes.org/pmwiki/pub/images/eater_of_worlds.PNG
"Screams echo around you..."
A giant-sized Devourer. It typically takes the Brain of Cthulhu's place as the second major boss in worlds afflicted with the Corruption.
  • Asteroids Monster: If you destroy a segment that would leave two intact segments ahead or behind it, the detached segments will become a separate worm that must also be destroyed. At a bare minimum, you have to kill at least half of the Eater of Worlds to kill it permanently.
  • Eldritch Abomination: A gigantic mutant worm with eyes all around it's body that heralds from the Corruption.
  • Sand Worm: Well, Corruption Worm. Plays this straight if summoned in a Corrupted desert.
  • Segmented Serpent: Each of its segments is its own entity with its own health bar, and are capable of acting as independent worms so long as two segments are connected.
  • Skippable Boss: If you can fish up the Reaver Shark, you can skip the Eater of Worlds. It'll be a bit harder to mine Hellstone with inferior armor, but not insurmountable (unless you farm Eater of Souls instead for the Ancient variety of Shadow Armor).

    Brain of Cthulhu 
http://static.tvtropes.org/pmwiki/pub/images/brain_of_cthulhu.PNG
"A horrible chill goes down your spine..."
Cthulhu's brain. It typically takes the Eater of World's place as the second major boss in worlds afflicted with the Crimson.
  • Doppelgänger Spin: On Expert, during the second half of the fight. Each time it teleports, it produces three translucent, harmless fake images of itself that also converge on you. As its health gets lower, these images become less transparent, making it harder to distinguish the real one.
  • Eldritch Abomination: Again, at least the brain of one.
  • Flunky Boss: Much like the Eye of Cthulhu, it summons eyeball-like minions to attack you. Unlike the Eye of Cthulhu, these must be destroyed if you want to hurt the Brain itself.
  • Skippable Boss: If you can fish up the Reaver Shark, you can skip the Brain of Cthulhu. It'll be certainly a bit harder to mine Hellstone with inferior armor, but not insurmountable.
  • Standard Status Effects: On Expert, any Collision Damage with the eyeballs or the Brain can cause the Confused, Poison, Bleeding, Darkness, Broken Armor, or Weak status effects.
  • Suspiciously Similar Substitute: Due to being a floating brain-like enemy that attacks you with eyeball-like minions, the Brain of Cthulhu is possibly the closest thing the PC version has to Ocram.
  • Teleport Spam: In the second half of the fight.

    Queen Bee 
http://static.tvtropes.org/pmwiki/pub/images/queen_bee.PNG
"The matriarch of jungle hives..."
A giant queen bee. Her larvae spawn inside bee hives and can be fought if broken. She's a sideboss and can be fought at any time although again like the King Slime, she doesn't count towards progression of Pre-Hardmode.
  • Bee Afraid: You stumble into a hive, with not many monsters inside unless you start digging into the walls. Then you attack the larva... and a gigantic bee attacks you furiously in retaliation.
  • Bee Bee Gun: Can send out smaller bees to attack you.
  • Beware My Stinger Tail: Like the Hornets, she can fire out venomous stingers that poison the player.
  • Big Creepy-Crawlies: The largest insectoid enemy in the gamenote .
  • Berserk Button: Killing the Bee Larva in any of the bee hives will summon her.
  • Flunky Boss: One of her attacks is to release a swarm of tiny bees that follow you relentlessly.
  • Glass Cannon: The bees she spawns have very little health, but they pack quite a wallop.
  • King Mook: A Queen Mook towards the Hornet enemies.
  • Mama Bear: Kill her larva and she'll awaken and attack you in retaliation.
  • Ramming Always Works: One of her attacks. She's able to fire out bees and stingers, but will also charge the player.
  • Skippable Boss: Like the King Slime, there's no particular need to fight the Queen Bee unless you want her loot.
  • Spam Attack: In Expert, her attacks get faster she nears death. This can lead to her chaining up charge attacks, or releasing swarms of bees followed by machine gun-like stinger barrages.
  • Standard Status Effects: Can poison you with her stingers.
  • Time-Limit Boss: Averted.
  • Turns Red: Only on Expert. Her attack pattern gets faster and more frequent as she loses health. In addition, her defense gradually increases as she takes damage on Expert, culminating in more than double her defense at critical health.

    Skeletron 
http://static.tvtropes.org/pmwiki/pub/images/skeletron.PNG
"The cursed guardian of the dungeon..."
A giant floating skull and arms that is summoned by talking to the old man at the entrance of a dungeon at night.
  • Cognizant Limbs: Both his hands. It's recommended to destroy them first, as they are his main means of attack. It's almost a required to kill them first in Expert, because his head will have 100 defense until you do.
  • Cycle of Hurting: On Expert, his spinning move upgrades once both arms are destroyed, becoming faster so he can stick to your character for continuous, huge Collision Damage.
  • Dem Bones: It's a floating skull with disembodied skeletal arms.
  • Dungeon Bypass: Very strongly averted. Try to tunnel past Skeletron and you'll be killed by the Dungeon Guardian, a Nigh Invulnerable Beef Gate meant to punish such an attempted bypass. Even if you decide not to enter the dungeon at all, he is still required to be defeated if you want the cultists to appear and trigger the Lunar Events.
  • Everything's Better with Spinning: For the player, anyway. His defense drops when his head is spinning.
  • Homing Projectile: In Expert, he fires homing skulls a la the Book of Skulls once you've destroyed one of his hands.
  • Time-Limit Boss: It will kill you if you do not defeat it by dawn.
  • Turns Red: At dawn, it transforms into the Dungeon Guardian and will One-Hit Kill you. In Expert, once his hands are destroyed, he begins firing skulls at the player while also upgrading his spinning attack to perform a Cycle of Hurting.

    Dungeon Guardian 
A special version of Skeletron meant to keep you out of the dungeon until you've defeated Skeletron proper, introduced to fix a loophole in which the Skeletron Heads that once held its role in earlier versions could accidentally grant access to the dungeon if killed. Delving too deep (below 0 depth, specifically) will summon this nigh-invincible horror, and thusly, your doom.
  • Beef Gate: It's intended to keep you out of the dungeon until you've earned it by defeating Skeletron. If you descend below 0 depth, it spawns. Unlike most Beef Gates, however, this one will keep spawning if you try to enter the dungeon, no matter how many times you kill it.
  • Bragging Rights Reward: The Bone Key it drops when killed, which summons a mini-Skeletron pet.
  • Dem Bones: A flying skull.
  • Doppelgänger Attack: The game treats it as a normal enemy, not a boss, so it is possible for more than one to spawn. It's not uncommon for two to chase you out of the dungeon. Death is pretty much assured when this happens.
  • Everything's Better with Spinning: Constantly in this state.
  • Implacable Man: It can phase through structures and the ground so walling it up is a no-go, it will chase you across the map and won't stop coming until either it despawns (which barring an endgame mount fast enough to outpace the creature would require an absolute miracle), it hunts down and kills you, or you manage to kill it. It's immune to knockback and will shrug off everything up to and including the most powerful weapons in the game without slowing down one bit. Your only advantage over it in the end is agility.
  • The Juggernaut: Doesn't stop homing in on you, takes Scratch Damage from everything, One Hit Kills you, and is practically invulnerable to knockback.
  • Lightning Bruiser: It can fly faster than anything short of the best mount in the game, and can One-Hit Kill an endgame melee tank build on contact.
  • Marathon Boss: You have to run away from it dealing Scratch Damage until its health depletes, which can take quite a long time. The absolute fastest you can kill the Guardian is in about five minutes, with the right equipment, and that's on Normal mode.
  • Nigh Invulnerable: It has 9999 HP (which is doubled in Expert Mode) and 9999 Defense (turning all attacks into Scratch Damage), and is Immune to Flinching. It can be killed, but only with a lot of preparation.
  • One-Hit Kill: Its sole purpose of existence. With an attack that deals 1000 damage, if it catches you, you're dead.
  • Permanently Missable Content: Vanishes once Skeletron is defeated, so get your Bone Key before you open the dungeon.
  • Ramming Always Works: It will crash into you at high speed and make you explode into gibs on impact.
  • Rasputinian Death: Pretty much required to kill it. In fact, it's likely that the reason why it blinks out of existence when it finally kicks the bucket is because in the process of killing it you have to grind up the creature until nothing remains.
  • Self-Imposed Challenge: Killing it is considered a personal achievement by Terraria veterans. The devs have acknowledged this, and it now drops the aforementioned Bone Key as a reward.

    Wall of Flesh 
http://static.tvtropes.org/pmwiki/pub/images/wall_of_flesh.PNG
"The master and core of the world..."

The final Pre-Hardmode boss, the Wall of Flesh is summoned by tossing a guide voodoo doll into lava in the underworld.
  • Advancing Boss of Doom: It will charge at you and pursue you from one end of the world to another, there is no way to get past it, and if it is still alive by the time it is on the other end, it will crush you to death.
  • Beef Gate: The Wall of Flesh will easily kill the under-prepared, to prevent them from unleashing hardmode prematurely.
  • Disc One Final Boss: The most powerful pre-hardmode boss you face before you go into hardmode.
  • Eye Beams: It fires volleys of purple lasers at you from its eyes, and the time between shots decreases as its health gets lower until it's full-on Beam Spam.
  • Eldritch Abomination: Moreso than the other pre-hardmode bosses because it can inflict a Mind Rape on you that forces you to kill it to survive. According to a card, it's the lord of eternal nightmares.
  • Final Boss: The strongest enemy in Easymode.
  • Flunky Boss: This game loves these bosses a lot. The Wall of Flesh has a number of flunkies called The Hungry attacked to it which reach out to damage you before detaching and flying at you upon death. It can also summon burrowing Leeches.
  • Go for the Eye: While both its mouth and eyes are vulnerable, the eyes have zero defence and thus do not benefit from any Damage Reduction, making them the preferred targets.
  • Living Structure Monster: The Wall of Flesh is Exactly What It Says on the Tin — a massive, moving wall of meat with eyes and a mouth.
  • Load-Bearing Boss: Its death infects the world with large swathes of ever-expanding Hallow and Corruption.
  • Marathon Boss: Clocks in at 8000 HP in normal mode, which is considerably higher than any other easymode boss. Even top-tier easymode weapons will take a while whittling this guy down.
  • Nintendo Hard: Either you're over-prepared or you die. There is no middle ground.
  • Time-Limit Boss: You have to defeat it before it reaches the other side of the world and kills you.
  • Turns Red: As you wear down its health, it will start gaining speed, belch up leeches more often and will shoot its Eye Beams more often. On Expert, he gains a massive burst of speed when at critical health.
  • You Will Not Evade Me: The wall will use its tongue to reel you in if you run to far from it, get behind it or try to escape the underworld conventionally. Trying to use the magic mirror to escape splatters you when you reach your spawn. This isn't as bad as it sounds for soft-core or even medium-core characters as your money/items drop at the spawn/bed that you warped to. Hard-core however...this happens.

    The Twins 
http://static.tvtropes.org/pmwiki/pub/images/retinazer.PNG
http://static.tvtropes.org/pmwiki/pub/images/spazmatism.PNG
A mechanical version of the Eye of Cthulhu, except there are two of them, Retinazer and Spazmatism.
  • Breath Weapon: Spazmatism will spew a constant stream of Cursed Flames in his second phase, though at least the range is limited.
  • Beam Spam: The lower Retinazer's health is in the second phase, the more it does so. At critical health it can fire as fast as a Megashark.
  • Degraded Boss: In a rare beneficial version! Players can craft an staff that lets them summon miniature stage two Twins to aid them in battle and they keep their signature breath and laser attacks. A properly geared player can have a pack of 18 of these things trailing behind them.
  • Dual Boss: The only one in the game.
  • Eye Beams: Retinazer, Retinazer, Retinazer. It gets worse the lowers its health gets.
  • Giant Eye of Doom: Two of them this time.
  • Hellfire: Used by Spazmatism.
  • Mechanical Abomination: The mechanical reincarnation of the Eye Of Cthulhu.
  • Robotic Reveal: Unlike the other mechanical bosses these two appear to be biological until they enter their second phases.
  • Short-Range Guy, Long-Range Guy: Apparent in their second forms—Spazmatism is the Short Range, attempting to stay close to breathe cursed flames and charge the player, while Retinazer is the Long Range, attempting to stay far while firing lasers at the player.
  • Time-Limit Boss: The two will run away at dawn.
  • Turns Red: Their second forms, but Retinazer has a particularly noteworthy one; the lower its health gets during its second phase, the faster it fires the laser cannon, until its essentially Beam Spam.

    The Destroyer 
http://static.tvtropes.org/pmwiki/pub/images/destroyer.PNG
"You feel vibrations from deep below..."
Possibly the first of the Hardmode bosses faced, it's a mechanical version of the Eater of Worlds.
  • Animal Mecha: A giant metal worm.
  • Attack Drone: Sends these out.
  • Beam Spam: Both its sections and probes can do this from time to time.
  • Boss Arena Recovery: Destroying the probes it sends out will get at least one heart and/or a mana star if you've been using magic weapons.
  • Damage-Sponge Boss: Has more HP than any other non-composite entity opponent in the entire game, but since all of his segments are individual targets vulnerable to attack, piercing and melee weapons will rack up massive amounts of damage by striking multiple segments on each pass, balancing out the extra health.
  • Flunky Boss: The probes it sends out upon being hurt.
  • Frickin' Laser Beams: The aformentioned probes will start letting out a barrage of lasers should they be allowed to survive for a bit.
  • Mechanical Abomination: The mechanised reincarnation of the Eater of Worlds.
  • Segmented Serpent: Good christ, with hundreds of segments this thing is massive. The player can attack multiple segments at one go, allowing them to deplete its massive HP faster. If someone has already defeated The Twins and has used their souls of sight to build a Magical Harpnote  weapon, the boss fight becomes nearly effortless.
  • Time-Limit Boss: Runs away at dawn.

    Skeletron Prime 
The mechanical version of Skeletron.

    Ocram 

The true final boss of the console version, Ocram can best be described as a flying Predator head.
  • Beam Spam: Its first form loves this. It's second form basically pumps out laser shotgun blasts at the speed of a machinegun.
  • Bullet Hell: During his second phase, he will be spraying countless laser blasts and Demon Scythes at a ridiculous speed. Not only does it do this itself, but this is also the focus of most strategies for fighting him.
  • Call Back: Oddly enough, to the Eye of Cthulhu. His strategy is similar, his flunkies are called "Servants of Ocram" like the Eye's "Servants of Cthulhu", and they share a battle theme.
  • Eldritch Abomination: Quite. His appearance is extremely otherworldly even in comparison to the likes of the Celestial Pillars and the Moon Lord.
  • Final Boss: Confirmed to be as such by the (console version's) developers.
  • Flunky Boss: Sends out Servants of Ocram, though he has plenty of other attacks. They're fairly easy to kill if you use Crystal Bullets. However, don't mistake him for relying solely upon them.
  • Giant Space Flea from Nowhere: Has no buildup or references, not even in the item used to summon him. He's also the only non-robotic Hardmode boss.
  • Lightning Bruiser: He moves fast and hits HARD.
  • Nintendo Hard: He's pretty much impossible to kill without near-endgame to endgame armor.
  • Omnicidal Maniac: If you summon it too close to your house/town, it can and will kill your NPCs.
  • Sdrawkcab Name
  • Turns Red: His second form turns out his eyes, reveals a bigger eye, and also amps up the power of his Beam Spam attack while allowing him to launch Blinding Demon Scythes.

    Plantera 
After defeating the three Mechanical Bosses, strange pink bulbs will begin gradually growing throughout the Underground Jungle. Breaking one will awaken the giant plant-like monster, Plantera.
  • Autobots, Rock Out!: Unlike every other boss, Plantera's theme is a heavy guitar-laden piece. It also doubles as a Boss Remix of the Jungle theme!
  • Combat Tentacles: Its invulnerable grappling hooks can deal damage, and it sprouts a bunch of smaller, destructible ones when it Turns Red. In Expert Mode, his grappling hooks sprout them too when it Turns Red!
  • Berserk Button: If you lure it out of the Underground Jungle biome, it will become more aggressive and damaging.
  • Flunky Boss: The plants that it sprouts when it Turns Red.
  • Homing Projectile: Its second form launches Spores that will seek out and damage the nearest player.
  • Impossible Item Drop: Plantera is a particularly strange case. Whereas most bosses can also drop some sort of item or weapon, most of them are somehow based on the abilities of the boss itself (e.g. the Book of Skulls fires the same skulls that Skeletron does in Expert Mode)... but what is Plantera doing with an electric guitar?note 
  • Man-Eating Plant: Even more so than the Man Eaters you used to encounter in the jungle.
  • Pun: Of the band Pantera, especially so because of its unique boss theme.
  • Spike Balls of Doom: Spits these out in its first phase.
  • Spike Shooter: First phase uses these. The rate of its fire increases as it loses health.
  • Turns Red: At half health, the flower will drop off, sprout tentacle plants, and it'll become much faster and damaging.
  • Wake-Up Call Boss: Plantera is significantly harder than the previous 3 Mechanical Bosses, and a large amount of preparation is needed to even stand a chance of killing it, especially since its bulb appears at complete random trying to lure it to a previously-crafted arena outside of the Underground Jungle is also a bad idea, discouraging the use of just building an ideal arena for battle.

    Golem 
A giant animated statue. Summoned by using a Lihzarhd Power Cell on an altar found inside the jungle temple.
  • Cognizant Limbs: His arms can be attacked and destroyed separately, though this isn't necessary to beat him.
  • Eye Beams: The first phase uses these when its health gets low. The head in the second phase also uses them.
  • Fireballs: Spits out bouncing ones.
  • Frickin' Laser Beams: The Eye Beams it fires are slower than light.
  • Golem: It's a construct created by the Lihzarhd.
  • Hyper-Destructive Bouncing Ball: The fireballs the head shoots out.
  • Losing Your Head: When he Turns Red. Justified because he's a construct.
  • Power Of The Sun: Many of the Golem's drops are associated with daytime and the sun.
  • Outside-the-Box Tactic:
    • The Golem used to be unable descend wooden platforms, and it spawns by dropping down from the ceiling. Setting up a barrier can prevent you from having to take Collision Damage entirely. This has been fixed as of 1.2.3.
    • It's still one of two bosses unable to pass through solid blocks, allowing a player to trap him inside and attack him from there with a wall-piercing weapon.
  • Rocket Punch: His arms. The Golem Fist he drops allows the player to do the same.
  • Turns Red: Its head flies into the air and becomes invincible when its health is depleted, forcing you to attack its body directly.

    Duke Fishron 
A giant fish-pig-dragon hybrid summoned by using a Truffle Worm as fish bait in the ocean.
  • Ascended Meme: Was originally supposed to be the boss of an April Fools' Day joke, the Tidal Moon event. While the event isn't real, Duke Fishron is.
  • Berserk Button: If you lure him out of the Ocean biome, it will become more aggressive and damaging.
  • Bonus Boss: He's the only Hardmode boss that doesn't need to be beaten in order to fight The Moon Lord, and you need to go somewhat out of your way in order to summon him.
  • Bubble Gun: Spits homing bubbles at the player.
  • By the Lights of Their Eyes: His Expert Mode ability shrouds the entire area in fog while he turns invisible, and his glowing eyes is one way to detect him before he charges.
  • Desperation Attack: He gains one when he's at very low health on Expert Mode. It involves him turning the screen dark while he turns invisible before he charges you.
  • Flunky Boss: Summons Sharknadoes and Cthulhunadoes that spew out flying shark projectiles called Sharkrons.
  • Flying Seafood Special: He's a huge flying fish.
  • Glowing Eyes of Doom: When he Turns Red.
  • Homing Projectile: His bubbles and his Cthulhunado typhoon.
  • Implacable Man: Got buffed in 1.3—he will repeatedly charge at you if you exit the ocean, instead of charging five times then attacking.
  • The Juggernaut: It will only stop when it's transforming to it's second state, pumping out bubbles or dead.
  • King Mook: To both a Mook (Pigron) as well as a particular fishing catch (Fishron).
  • Lightning Bruiser: Extremely fast, extremely painful, and sports 50000 health, more than most other bosses.
  • Mix-and-Match Critters: A fish-pig-dragon creature.
  • Mutant: The official achievement unlocked by beating him outright calls him one.
  • Nintendo Hard: Deals painful damage with his attacks, moves extremely fast, and a lot of health to wear down. Speed-increasing items and Wings are pretty much mandatory if you don't want to be torn to shreds. In 1.3 and above, you're also constrained to fighting him within the ocean, or else he gets pissed.
  • Ramming Always Works: Has a high tendency to ram the player.
  • Shout-Out: Has the ability to summon Sharknadoes.
  • Trademark Favorite Food: He can only be summoned via a Truffle Worm.
  • Turns Red: Gains Glowing Eyes of Doom, charges faster but less often, and changes his bubble spray into a spinning spray that creates more bubbles and his Sharknado into a Cthulhunado which is much larger, homes in on the player before deploying, and summons many more Sharkrons. The Fishron Mount obtained from him in Expert Mode allows the player to do this—when low on health, the player gains an attack and speed buff.
    • Expert added a third phase to his fight: at critical health, he will darken the screen, turn invisible, and continuously charge at you while constantly teleporting to approach you from different angles.
  • Victor Gains Loser's Powers: When the player beats him, they get equipment based on his abilities: Flairon and Bubble Gun are based on his bubble spray, Tsunami is based off his relentless charges, Razorblade Typhoon is based off his Cthulhunado-spawning homing typhoons, the Tempest Staff is a smaller Sharknado, Fishron's Wings give the player the Duke's superior air and water mobility, and the Expert Mode Shrimpy Truffle nets the Duke himself as a mount, allowing you to Turn Red when low on health.

    Lunatic Cultist 
After Golem is defeated, a group of cultists will gather outside the dungeon praying towards an ominous stone. Killing all of them incites the wrath of the Lunatic Cultist, who absorbs the power of the stone, and attacks you.
  • Apocalypse Cult: He's the leader of them.
  • Big "NO!": He says this upon death.
  • Doppelgänger Attack: If you fail to interrupt his Doppelgänger Spin, the copies follow him around in an upside-down 'V' formation and are able to attack you. They can't be damaged or destroyed until his next spin, which will cancel them out if you do it right.
  • Doppelgänger Spin: After several magic attacks, he'll create several copies of himself surrounding a runic circle. If you don't hit the original (distinguished by a yellow vertical stripe on his hood, among other minor differences), it becomes a Doppelgänger Attack and he summons a phantasm dragon. Each time you fail this, he gains more copies until you get it right.
  • Evil Sorceror: Very much so.
  • Evil Sounds Deep: His voice sounds inhumanly deep as he prays to the stone in Black Speech before absorbing it and turning his attention to you.
  • Fire/Ice/Lightning: Can cast homing fireballs, ice crystals that fire ice spikes, and lightning bolts.
  • Humanoid Abomination: The Lunatic Cultist may look human, but his exceptional magical strength as well as his voice, which borders on Voice of the Legion, heavily implies that he is something not of this world.
  • Instant Awesome, Just Add Dragons: He can create a circle that summons a huge phantasm dragon.
  • Instant Runes: He will create a massive runic circle just before creating a doppelgänger and attacking.
  • Meaningful Name: He's lunatic in both senses of the word—crazy, and also moon-related.
  • Unstable Equilibrium: The fight with him can either be reasonably difficult or downright impossible, depending on your ability to interrupt his Doppelgänger Spin.
  • With My Dying Breath I Summon You: He summons the four Celestial Towers when defeated.

    The Celestial Towers (Vortex, Nebula, Solar, and Stardust Pillar)  
Four ominous pillars that appear after the Cultist Lord is beaten. These spawn powerful alien enemies, and must be defeated by killing enough of their minions to break the shield. Each of the pillars and their mooks correspond to a method of offence - Vortex for ranged, Nebula for magic, Stardust for summoner and Solar for melee.
  • Amazing Technicolor Battlefield: All of them turn the background to an ominous moon with coloured background when fought.
  • Brown Note: It's suggested by the messages that appear after destroying them that they have a pretty bad effect on the player character. It is not clear whether this is the Towers' doing or the Moon Lord's.
    First Tower: "Your mind goes numb.."
    Second Tower: "You are overwhelmed with pain..."
    Third Tower: "Otherworldly voices linger around you..."
  • Cosmic Entity: They have the markings of this as they both draw power from and seem to embody on a level their respective cosmic forces in the universe.
  • Deflector Shields: When first encountered, they have a clear forcefield around them that makes them invulnerable. It's only when you kill off 100 (150 in Expert) of their minions that the shield breaks.
  • Eldritch Abomination: All four of the pillars are some kind of otherworldly aliens. It's unknown if they're even sentient.
  • Flunky Boss: The pillars do attack, but mainly rely on spawning minions. It's also required that you beat enough minions first in order to attack the boss itself. Once their shields are down, though, they are practically helpless and only have 20000 HP.
  • Mook Maker: Besides the bosses themselves, a number of the mooks can also spawn more mooks that will grow into even more Mook Makers if not removed in time.
  • Our Wormholes Are Different/Swirly Energy Thingy: The Vortex Pillar creates these around the player, which spawn Alien Hornets.
  • Playing with Fire/The Power of the Sun: The Solar Pillar's mooks are rather fiery and sun-like, and the pillar itself with attack with a shower of fireballs, many of which can be seen raining down in its background.
  • Shock and Awe: The portals created by the Vortex Pillar can sometimes shoot a bolt of lightning at you, instead of spawning more Mooks.
  • Shows Damage: Every time one of their minions (besides Crawltipedes) die, they generate a bolt of energy that strikes the Tower's shield and causes it to visibly weaken. The shield itself gets more and more transparent until finally bursting.
  • Star Power: Of the Lovecraftian sort. The Stardust Pillar is able to create "stars" around it that spawn Star Cells and Milkyway Weavers.
  • Stationary Boss: They don't move at all, and none of them apart from the Solar Pillar are directly capable of attacking you.

     The Moon Lord 
The Lunar Event Boss - a large, Cthulhu-like being that is summoned after the four Celestial Towers are destroyed. His arrival is signified by a sense of impending doom, as the screen starts warping and turning black. As of the 1.3 update, he is the final boss of the game.
  • Attack Its Weak Point: The giant beating heart in his chest. The problem is that you must destroy all three of his eyes if you want him to expose it.
  • Background Boss: Stays in the background all the time. However, touching its eyes (or where they used to be) will deal Collision Damage.
  • Beam Spam: The Moon Lord excels at this, with his entire offensive pattern being pretty much trying to obliterate the player with endless volleys of eldritch-plasma blasts while trying to pick them off with up to three giant laser blasts in one go.
  • Boss Vulnerability: Each of the targetable eyes are a Wait Them Out sort, while the heart is Always Vulnerable once it's exposed.
  • Cognizant Limbs: The eyeballs in his hands and his Third Eye can attack separately and must be destroyed for him to expose his core.
  • Cthulhu Mythos: Heavily resembles Cthulhu. His eyeball minions are even called "True Eye Of Cthulhu". Word of God has stated that he is Cthulhu's brother.
  • Damage-Sponge Boss: His component parts have collectively more health than anything in the game. His Third Eye and heart have more health than every other boss save the Destroyer.
  • Darkness Equals Death: He turns the background around him black, so if you lose track of him, a good way to find out where he's gone is the background rapidly growing darker as he slowly comes back.
  • Eldritch Abomination: An eldritch horror from the depths of space.
  • Evil Is Bigger: The largest enemy in the game as of now.
  • Eyes Do Not Belong There: Has an eye in each of his hands. He can also fire countless energy eyeballs at you for his attacks.
  • Final Boss: Is this for the entire game.
  • Flunky Boss: When each eye is beaten, they will become an invincible flunky that attacks on its own.
  • Homing Attack: Can fire Phantasmal Eyes that home in on players and explode.
  • Kaizo Trap: During his death animation, the holes where his weak points used to be will still hurt you; if you're low enough on health, you'll get killed and he'll disappear without leaving behind any of his valuable drops or giving you the achievement for killing him.
  • Life Drain: Has an ability where his mouth sends out a sucker that starts draining balls of energy from you. If the balls are not destroyed before they reach his mouth, he regenerates health. During this, he'll inflict the Moon Bite debuff which also prevents you from lifestealing from him for the next fifteen seconds or so.
  • Mighty Glacier: The most powerful boss, and yet also one of the slowest.
  • Power Floats: Floats around the area effortlessly.
  • No Sell:
    • He's immune to lifestealing effects from the Spectre Armor and the Vampire Knives when he's leeching energy from you.
    • As of 1.3.0.6, it's impossible to "cheese" him via using Mercy Invincibility from other sources of damage—he will still hit you.
  • Nothing Is Scarier: Before he appears, the background music ominously disappears.
  • Sequential Boss: His three main eyes must be destroyed first, then his core will open.
  • Super-Persistent Predator: Will chase the players across the map. 1.3.0.4 made it such that he just teleports right to you if you get too far from it.
  • Standard Status Effects: Moon Bite is of the Decover type, preventing Life Drain effects from working on him.
  • Stripped to the Bone: When beaten, his skeleton drops to the ground.
  • Third Eye: While he has a lot of eyes to begin with, the one on his forehead is the most prominent: it has the most health, is closed for most of the time and is the only one that can fire the Phantasmal Deathray.
  • Wave Motion Gun: Can fire a Phantasmal Deathray from his Third Eye. It sweeps around from one side of the screen to the other and does a great amount of damage, but is stopped by solid blocks. When an eye is detached, it can use a similar but weaker laser.
  • You Will Not Evade Me: The 1.3.0.4 update made it such that he teleports right to you if you get too far from him.

Enemies

    Lost Girl/The Nymph 
What appears to be an NPC named "Lost Girl", similar to the ones the player can rescue. Approaching her, however, has her transform into a green-skinned nymph that will maul unsuspecting players with potent melee attacks.
  • Barbie Doll Anatomy: She's depicted as fully naked, but lacks nipples or genitalia. Probably a display of modesty more than limitations of the art style.
  • Full-Frontal Assault: She wears absolutely nothing while trying to kill the player.
  • Horny Devils: Mentioned above, she's naked and fairly attractive. Until she turns that is...
  • Lightning Bruiser: She hits like a truck, moves twice as fast as normal mooks, and is harder to knock back.
  • Luck-Based Mission:
    • Finding her in the first place is luck, because unlike other enemies she doesn't move. Unless you have the Lifeform Detector, it's entirely possible you'll pass right by without even noticing her.
    • She has a 50% chance of dropping the Metal Detector, one of the items needed to craft the Cell Phone. Considering her rarity, this can make obtaining it pretty annoying. In Expert Mode, thankfully, it's a guaranteed drop. Prior to the 1.3 update, getting her banner was even worse, as the drop rate is only 0.5%. Now you just have to kill 50 of her. Good luck with that.
  • Schmuck Bait: Hey, it's another NPC. I'll just go up and—"Player's flailing about was finally stopped by Nymph."
  • You Gotta Have Blue Hair: She has light silver-y blue hair. Made more obvious in the "Deceiver of Fools" achievement image.

    Clown 
A Hardmode enemy that only spawns during Blood Moons. The Clown throws bombs, and, until Patch 1.2, was the only enemy in the game capable of damaging blocks.

    Sand Elemental 
The Sand Elemental uncommonly appears in a Hardmode Desert biome during a sandstorm.

    Ice Golem 
The Ice Golem uncommonly appears in a Hardmode Ice biome during a blizzard.

    Wyvern 
The Wyvern sometimes appears in high altitudes in Hardmode.

    Slimes 
All slimes behave the same: They hop to get around and all but a few drop slime gel upon death. They come in all different colors and sizes such as green, blue, red, purple, yellow, black slimes that inflict darkness (reduced light vision), mother slimes and their baby slimes, Pinky, Jungle Slimes, Dungeon Slimes that drop keys instead of gel, Lava Slimes that turn into lava in Expert Mode, and The Slime King. In Hardmode, they are joined by the Toxic Sludge that can poison the player, Corrupt slime and its slimelings that can also inflict darkness with a Shadow Slime variant in the Console version, the slimer that flies on bat wings, and the glowing Illuminant slime that's found in the underground Hallow, above ground is the Rainbow Slime that can rarely spawn in rainstorms and drop rainbow bricks. The Crimson on the other hand will have Crimslimes that don't have the splitting or darkness inducing effect of Corrupted (or Shadow) slimes.
  • Blob Monster: Naturally, given that they are gelatinous monsters.
  • Glacier Waif: Pinky may be the smallest slime of the game, but it's only second to King Slime in terms of health when it comes to all of the slimes available before hardmode and it drops dozens of Pink Gel in contrast to its size.
  • Informed Attribute: The gel they are made of is apparently rather tasty (particularly Pinky's), but it's impossible to eat it raw without crafting it into a potion.
  • King Mook: The King Slime.
  • Metal Slime: Pinky, who drops a single gold coin and some Pink Gel but happens to have the highest health of any pre-hardmode slime. Rainbow Slimes count too; they show up very rarely in the Hallow during rainstorms while you are close to pure land, and drop the sought-after Rainbow Bricks.
  • Money Spider: Jungle Slimes, pre-hard mode. Most other enemies drop maybe one silver coin if they're high tier and you get lucky, while Jungle Slimes drop four or five silver coins as standard, aren't particularly hard to kill, and spawn in droves.
  • Rare Random Drop: The Slime Staff has a 0.01% chance of being dropped by most slime variants. Hours upon hours upon hours can be spent trying to get the staff.
  • Standard Status Effects: Darkness (reduced light vision) and poison. The lava slime originally counted for fire since they turned into lava when killed before a patch removed that trait, until it was added in again as an Expert Mode trait.

Pinky

A rare overworld slime that is tiny and pink. It's hard to hit but, when killed, it will drop a single gold coin (worth 100 silver, or 10,000 copper) and some Pink Gel, useful for players starting out.

    Zombies 

Once night comes, slimes stop appearing, and zombies come instead. They're just like your standard zombie, being slow but coming in great numbers. They're especially dangerous during a blood moon, when they appear in greater numbers and gain the ability to open doors.

Doctor Bones

A zombie that spawns rarely in the jungle (both above and underground) during the night, wearing an archaeologist's hat, who drops it when killed. It's tougher than the regular zombie as well.

The Groom

A zombie wearing a top hat that spawns during a blood moon, the top hat is also dropped upon death, like Dr. Bones, he also has higher HP than the regular zombie.

    Skeletons 
You spend a lot of time battling skeletons in the game so here's a list of them: The first type of skeleton is found underground and drops hooks occasionally. Then, there's the undead miner and Tim. Skeletron is fought to get into the dungeon. Once you get to the dungeon, you find angry bones that come in their normal size, along with big boned and small boned sizes. Also present are dark casters and then the cursed skulls (which can curse the player, rendering them unable to use items). In the underworld, you will find the bone serpent. On hard mode, the player fights armored skeletons and their heavy variants underground that poses a threat of breaking their armor (halved defense for five minutes) and skeleton archers that shoot flaming arrows at the player. And, finally, there is Skeletron Prime.
  • Dem Bones: A whole collection of them, no less!
  • Standard Status Effects: Cursed (unable to use items) from the flying cursed skulls, broken armor (halved defense for 5 minutes) from armored/heavy skeletons, and fire from skeleton archers.

Undead Miner

A skeleton that appears underground, wearing a glowing mining helmet. When killed, it can drop bombs, a hook, or mining pants/shirt. They're easy to spot due to the glow of their helmets, and they can help illuminate undiscovered caverns.
  • Metal Slime: Quite rare, and killing it is the only way to get the Bone Pickaxe and the Mining Armor.

Tim

A skeleton sorcerer that can spawn underground. Like other casters, it will teleport around and fire projectiles until you kill it. When killed, Tim drops a wizard hat that can be used to increase magic damage or simply as a vanity item.

Rune Wizard

Appearing in the Hardmode Caverns, the Rune Wizard is an extremely rare enemy with one of the most powerful attacks in the game.
  • Glass Cannon: He can dish out some incredible pain, but he can't take a hit.
  • Nice Hat: You get his hat and robe if you kill him.
  • Teleport Spam: Not to the extent of the dungeon mages, but he does warp around if you can't kill him quickly.

Paladin

Appearing in the 1.2 Hardmode Dungeon, the Paladin is a heavily armored knight that throws giant hammers that pass through walls.
  • Drop the Hammer: And they will sometimes drop from dead Paladins, and allow you to do the same thing.
  • Light Is Not Good: It has really bright armor, and it starts not-so bright chaos.
  • Mighty Glacier: With its very high offense, it can easily maim you in seconds while you struggle to kill it.
  • Sword Beam: In the form of hammer projectiles.

Biomes

     The Corruption 
Once you start exploring the Corruption, there are various, sickly looking, enemies, starting with the Eater of Souls: Small, flying enemies that swarm the player, along with Big Eaters and Little Eaters, all three of which drop rotten chunks. There is also the Devourer Worm that burrows through the ground, also dropping rotten chunks, along with worm teeth, used for unholy arrows. Then the king mook of the environment is the Eater of Worlds (see above in bosses). Bunnies and goldfish turn into corrupted versions of themselves during a blood moon. Once in hardmode, the aforementioned Corrupt Slime and its slimelings spawn, along with the Slimer. Then there is the Corruptor, a flying enemy like the Eater of Souls but it can shoot vile spit that has a chance to weaken the player. If the Corruption spreads to a desert, dark mummies will spawn, which drop dark shards by chance. Deeper down underground, World Feeders start to spawn, looking like the EoW mentioned above, that drop cursed flames when killed. Cursed hammers also roam the caves, and charge their target, having a chance to curse the player (unable to use items). Finally, there's the Clinger that acts like a plant enemy such as the man-eater, but it can spew cursed fireballs, flames that cannot be put out, even by water, meaning they also drop cursed flames when killed.
  • Airborne Mook: Eaters of Souls, Corruptors, and Slimers.
  • Alien Kudzu: Although not confirmed, there all too many subtle hints that the Corruption at first may have been of extraterrestrial origin (i.e: the connection to meteors and the Shadow Orbs that are meant to be destroyed in order for them to appear, the Band of Starpower that can be released from said Shadow Orbs, etc).
  • Dark Is Evil: It turns the landscape bleak and foreboding and turns the very rock black.
  • Eldritch Location: This place compared to the land around it is unnatural. Weird, rotting monstrosities spawn out of deep chasms in the ground and it assimilates the land around it. All of that can tell you that all is not well in that land.
  • Elite Mook: Corruptors, considering that they can appear much more often than other Hardmode corrupted creatures and have that little bonus of spreading the corruption with their vile spit. Past 1.2 though, the corruption spreading bit has been taken out but they have a decent ranged attack and enough health to shrug off some attacks.
  • Evil Tainted Place: An evil, spreading biome that corrupts the land and turns critters into twisted, stronger versions of themselves.
  • Foil: A rather obvious one to the Crimson: while both are eldritch (and possibly, truly extraterrestrial) Alien Kudzu anomalies, the Corruption more represents inherent evil than the visceral horror of its counterpart and is somewhat more fantasy-like in nature, which becomes more apparent in Hardmode.
  • Flying Weapon: The Cursed Hammer; a flying cursed hammer, of course.
  • Giant Mook: Big Eaters, which are slightly stronger than the regular Eaters. World Feeders are this to Devourers.
  • Mini Mook: Little Eaters, which are slightly weaker than the regular Eaters.
  • Shout-Out: Possibly one to The Colour Out of Space.
  • Standard Status Effects: Corrupt Slimes and Dark Mummies inflict Darkness, Clingers inflict Cursed Inferno (water cannot put it out), Corruptors inflict Weakness (reduced stats) and Cursed Hammers inflict Cursed (cannot use any weapons or consumables).

     The Crimson 
The Crimson biome appears as an alternative to the regular Corruption, a land of rotting flesh and bodily fluids. Their lands instead resemble neuron pathways rather than the "impact craters" style of their counterparts. Their normal mode enemies include the Crimera, a floating cockroach-like expy of the Eater of Souls, Face Monsters which are basically faster and tougher zombies, Blood Crawler which are giant spiders which crawl long the walls to get you, and Blood Feeders which are monstrous fish. Hardmode enemies include the Crimslime, the Floaty Gross, the Herpling, and the Ichor Sticker.
  • Alien Blood: Ichor, the elemental counterpart to the Corruption's Cursed Flames, is consistently portrayed as both the Greek mythology (blood of gods and / or immortals, deadly to mortals) and the bodily fluid (i.e: pus) versions of its namesake.
  • Alien Kudzu: Possibly, just like the Corruption (if the connection to Cthulhu with the Brain of Cthulhu and by extension, the Moon Lord, was any indication).
  • Animalistic Abomination: Blood Crawler and Blood Jellies.
  • Artistic License – Biology: The Blood Crawler drops vertebrae despite being based on an invertebrate. Could be a way to show that the eldritch nature of the Crimson that goes against nature itself.
  • Big Creepy-Crawlies: Blood Crawlers are basically huge ticks.
  • Bloody Murder: The Ichor Sticker shoots ichor at you, described as the blood of gods.
  • Body Horror: Face Monsters. Floaty Gross as well, if it's name is any indication; considering that it rather looks like a Gardevoir made out of bodily fluids, one could say it's pretty spot-on...
  • Came Back Wrong: The Floaty Gross is classified as an Undead enemy, and it has come back alright, and very very wrong.
  • Eldritch Location: Like the Corruption. It's an otherworldly, unnatural place that turns the earth itself into flesh as it assimilates it, and spawns murderous, disgusting, Body Horror-riddled Eldritch Abominations.
  • Expy: The Crimera to the Eater of Souls, Crimslime to Corrupted Slime, the Ichor Sticker to the Corruptor and the Crimson Axe to the Cursed Hammer.
  • Evil Is Visceral: An evil place with a flesh, blood and gore theme.
  • Evil Tainted Place: An alternative to the usual purple one.
  • Foil: To the Corruption: while both are eldritch (and possibly, truly extraterrestrial) Alien Kudzu anomalies, the Crimson more represents visceral horror than the inherent evil of its counterpart and is even more sci-fi in nature (especially if one believes in the theory that the Crimson is just Cthulhu's rotting remains tainting the landscape).
  • Flying Seafood Special: The Ichor Sticker is basically a flying squid.
  • Flying Weapon: The Crimson Axe. A counterpart of the Cursed Hammer.
  • Humanoid Abomination: Face Monsters and to a lesser degree Floaty Grosses.
  • Lovecraftian Superpower: The Ichor Stickers wear this on their sleeve.
  • Nightmare Face: There's a pretty good reason why the Face Monster is named that way.
  • No Sell: Forget using Sunflowers to stop Pre-Hardmode Crimson, it will uproot them and take over the grass instead.
  • Red and Black and Evil All Over: The combination of black necrotic flesh and blood-covered tissue give it this look.
  • Theme Naming: Many of the Crimson creatures and related items begin with "Crim".
  • Shout-Out: How the trees in the background of Forests afflicted with Crimson are covered in intestines and overall the entire biome's red gore theme (and possible connection to an extraterrestrial lifeform) brings to mind the Red Weed from War of the Worlds.
  • Standard Status Effects: Ichor Stickers inflict Ichor (lowers defense considerably), while the Floaty Gross inflicts Weakness.
  • Womb Level: It's definitely this.

     The Hallow 
Once hardmode is activated, the hallow will start spreading as a bright, colorful environment with pearlstone, teal-colored grass, and rainbow-colored trees. This is also a straight example of Light Is Not Good, meaning that the inhabitants aren't merciful, such as violent pixies that deal heavy amounts of damage, along with a chance to slow you or silence you (unable to cast spells). Pixies drop dust when killed. Unicorns also roam around the hallow, and will charge you at high speed. They drop unicorn horns for the purpose of holy arrows and such. At night, there are also gastropods that can slow the player on contact, fire lasers at you from as far as off-screen, and drop gel upon death, like slimes do. Hallowed deserts contain a light equivalent of the dark mummies that drop light shards. Underground, there's the aforementioned illuminant slime as well as an illuminant bat. Chaos elementals that Teleport Spam to attack and avoid the player are also found here. Contrasting the underground corruption, there are enchanted swords that also attack the player and curse them.
  • Crapsaccharine World: Bright, cheerful and healthy for the environment...and filled with vicious fairytale creatures.
  • Flying Weapon: The Enchanted Sword. Unrelated to the equipable sword of the same name (In fact it looks like a glowing Excalibur). It's also the Hallowed version of the Crimson Axe and Cursed Hammer.
  • Flying Seafood Special: Gastropods, if you consider them jellyfish.
  • Heavenly Blue: Hallowed grass becomes blue, and the Hallow in general is stated as having been overcome by the spirits of light. Additionally, there's also the Holy Water, a thrown weapon that spreads hallow upon impact.
  • Light Is Not Good: Played painfully straight - despite the rainbows, pastel colors and flora-friendly atmosphere the biome is filled with creatures just as dangerous as the ones dwelling within the Corruption and Crimson. However, the Hallow does not force NPCs to move out unlike the Corruption and Crimson.
  • Lightning Bruiser: Unicorns. Chaos elementals, considering that they can take about as much in damage, move as fast as the player and also Teleport Spam to close the distance even faster.
  • Standard Status Effects: Pixies inflict slowness (along with the gastropod) and silence, enchanted swords inflict cursed, light mummies inflict confusion.

Events

     Blood Moon 
The Blood Moon has a 1 in 10 chance of occurring each night with a visible moon so long as a player with 120 health or more is in the world. Unlike other events, the Blood Moon incorporates biome specific monsters as well as their event specific monsters into the fray. In addition, certain harmless critters, such as rabbits and goldfish, turn hostile during the event, and will attack the player. Zombies and other monsters gain the ability to open doors, making them a much larger threat then they are usually.

     Slime Rain 
The Slime Rain occurs once the player(s) have 140 life and 8 defense or it can occur before that with a lower chance in Expert Mode, at a ≈%10 chance per day pre-hardmode and a ≈%6 chance during hardmode. When it occurs, Slimes literally start falling from the sky even when enemies normally do not spawn such as being near NPCs. The event ends 24 (in-game) hours after it begins or when the player kills 150 slimes then it will summon the King Slime, after which the event ends when the King Slime is defeated. Subsequently, the chances of a Slime Rain occurring after defeating the King Slime are roughly halved and it only requires killing 75 slimes the next time a Slime Rain occurs.
  • It's Raining Men: The idea behind this event. The background even changes accordingly to feature this.

     Old One's Army 
A special crossover event (from Dungeon Defenders 2). Triggered by placing an Eternia Crystal on an Eternia Crystal Stand, the objective is to protect the Eternia Crystal from waves of enemies seeking to destroy it. Unique in that the event's difficulty depends on when you trigger it: triggering it after defeating the Golem results in more waves of enemies (and the enemies themselves having better stats) than you'd get if you triggered it as soon as it's available. When triggered in its hardest version, the event ends with a fight against a "boss", Betsy.
  • Action Bomb: Both Kobolds variants are some of the few enemies in the game that do this.
  • Fire/Water Juxtaposition: Betsy (fire) and Duke Fishron (water). Betsy has an attack pattern very similar to Duke Fishron's, both alternating between charging, a blowing attack (a fire breath and several bubbles, respectively), and throwing projectiles (fireballs and sharknados, respectively). They're meant to be fought at roughly the same moment of the game (soon after defeating Golem), and accordingly they have the same health (although Betsy has lower damage and defense since it's part of an event, while Duke Fishron is a stand-alone boss).
  • Flunky Boss: The Dark Mage has the power to summon Old One's Skeletons.
  • Instant Awesome, Just Add Dragons: Betsy is the only enemy in the game based on a Western dragon (other dragon-like enemies like Wyverns or Phantasm Dragons resemble more Eastern dragons).
  • Our Monsters Are Different: An interesting case. The enemies that appear during the event are all based on enemies from Dungeon Defenders 2. However, many of those enemies (namely skeletons, goblins, wyverns and lightning bugs) happened to share a name with creatures previously found in Terraria, even though all of them are very different from the already-existing version (the normal lightning bug is even a critter). To distinguish them, the new version has "Etherian" or "Old One's" in front of his name.
  • Our Ogres Are Hungrier: Ogres appear as a mini-boss during this event.
  • Shockwave Stomp: One of the Ogre's attacks.
  • Standard Status Effects: Several of them. Lightning Bugs can reduce your damage while Wither Beasts can reduce your defense. Ogres throw you a snot ball that slows you while Betsy is able to burn you.
  • Tower Defence: As expected from an event inspired by Dungeon Defenders 2.
  • You Shall Not Pass: Your goal in the game is to prevent hordes of mobs from taking out your crystals.

     Goblin Army 
Once the player has over 200 health and has defeated the Eater of Worlds, then the goblin army may invade at the start of a random day.
  • Airborne Mook: The Summoner can fly around to evade your attacks.
  • Berserk Button: Apparently you can start a war with them using a flag made of tattered cloth. The Goblin Tinkerer mentions that they have quite the Hair-Trigger Temper.
  • Boss in Mook Clothing: The Goblin Summoner, who only appears in Hardmode, is much beefier than the rest of her army and summons homing projectiles on you.
  • Fragile Speedster: Thieves.
  • Glass Cannon: Archers, they're not as fragile as the wizards but they are made short work of if you get close to them
  • The Goomba: Goblin Peons are the weakest and most expendable units, although they do have the ability to break down (not open like Blood Moon Zombies, break down) doors.
  • Hitbox Dissonance: Peons and Thieves have a smaller hitbox than their sprite, allowing them to squeeze through smaller areas.
  • Squishy Wizard: Sorcerers—they're commonly offed with a single hit. Subverted with Summoners, who have much more health than the rest.
  • Teleport Spam: Sorcerers, the Goblin Summoner takes this Up to Eleven.

Goblin Scout

A semi-rare enemy that appears above 0 depth, during the day, around two-thirds away from the center of the map (the same area in which the King Slime can spawn). Scouts will not spawn on sand or in the corruption, nor will they appear among the other goblins during the goblin invasion.
  • Metal Slime: Quite rare, and killing several of them is the only way to get the summoning item for the Goblin Army.

     Pirate Invasion 
The pirate invasion can occur during Hardmode by a 6.22% chance at the start of any day or if the player uses a pirate map (dropped from enemies in the ocean) and approaches much like a goblin invasion. The force consists of Deckhands, Deadeyes, Corsairs, Crossbowers, Captains, Parrots, and the "boss", the Flying Dutchman.
  • Airborne Mook: Parrots are fast flying enemies that deal large amounts of damage if they hit you.
  • Authority Equals Asskicking: The Captains are the toughest to deal with out of all the types of pirates.
  • Boss in Mook Clothing:
    • Captains, immune to knockback (although constant DPS and DOT does keep them from attacking) and carry a rapid fire machine gun with a cannon strapped to it like an M203.
    • The Flying Dutchman, a large flying pirate ship that rains cannonballs and drops pirate mooks into the fight. It has four high health cannons that must be taken down in order to be beaten.
  • Guys Smash, Girls Shoot: The Deckhands and Corsairs will attempt to charge the player, and while the Deadeye and Captain do use ranged weapons, they still attempt to move towards the player to deal collision damage. The female crossbower however stays in the back lines firing flaming arrows.
  • Mighty Glacier: The Captains are immune to knockback and can both dish out and endure heavy damage. However, they are quite slow.
  • Pirate Girl: The Crossbower is one of the few female humanoid enemies in the game.
  • Pirate Parrot: The parrots, which appear alongside the pirates.

     Solar Eclipse 
After a Mechanical Boss has been defeated, there is a 4% chance that the entire day may be a Solar Eclipse, where monsters straight out of horror movies appear in droves to attack the player. It can also be summoned by using the Solar Tablet during the day. The monsters include Swamp Things, Vampires, Eyezor, Frankenstein, The Possessed, Fritz, and Creature from the Deep. Reapers and Mothron appear after all three Mechanical bosses are beaten, and Butchers, NailHead, Deadly Spheres, Psycho and Dr. ManFly appear after Plantera is beaten.

     Martian Madness 
When traveling around the map after Golem is defeated, one may spot a Martian Probe. If the player gets into its sensors, it will attempt to fly away, and if successful, the Martian Madness event will trigger. The force consists of Martian Walkers, Martian Drones, Martian Officers, Brain Scramblers, Gigazappers, Gray Grunts, Martian Engineers (and their spawned Tesla Turrets), Skutlix, Skutlix Gunners, Ray Gunners, and the boss, the Martian Saucer.
  • Airborne Mook: Martian Drones fly around and attempt to kamikaze the player.
  • Alien Blood: Their blood seems to be purple in colour, considering the color of the flesh on their gibs.
  • Boss in Mook Clothing: The lightning-quick Martian Saucer. It has four high health cannons that provide it with a plethora of attacks such as Beam Spam and Macross Missile Massacre, and a Death Ray it will use that deals huge damage. When those four cannons are destroyed... it becomes vulnerable, but will then repeatedly use the Death Ray attack. Thankfully, you can spare yourself from the beam by hiding underneath some blocks.
  • Deflector Shields: The Martian Officer sports these, allowing him to take more damage than the normal martians.
  • Flying Saucer: The Martian Saucer. It can drop a Cosmic Car Key, which allows you to ride your own.
  • The Greys: The martians are based off these.
  • Shock and Awe: The Tesla Turrets deployed by Martian Engineers. It can even cause an "electrified" debuff that deals constant damage, more so if you're moving. The Martian Saucer can drop the Electrosphere Launcher.
  • Tripod Terror: The Martian Walkers.
  • The Turret Master: Martian Engineers can spawn Tesla Turrets which attack you.
  • Wave Motion Gun: The Martian Saucer has one of these. It can also drop the Charged Blaster Cannon which can be charged to fire this.
  • Weaksauce Weakness: The Martian Saucer has no attacks which can pass through blocks. A simple box thick enough to block splash damage from the missiles renders it harmless, provided you leave a hole for something to shoot through or something that shoots through blocks.

     The Pumpkin Moon 
By crafting a Pumpkin Moon Medallion and using it at night, the player can summon the Pumpkin Moon. The Pumpkin Moon is similar to the Goblin and Pirate invasions, but it also has some special mechanics of its own. The invasion will progress in waves, each one featuring progressively harder batches of enemies to fight. The player can encounter Scarecrows, Splinterlings, Hell Hounds, Poltergeists, and Headless Horsemen. Killing enough enemies will allow the player to move on to the next wave until they reach wave 15, the final wave. Another key difference from the other invasion events is that starting with wave 4, boss-like enemies will emerge. In this case, they are Mourning Wood and Pumpking.
  • Scary Scarecrows: The first Mook to show up. A-list Cannon Fodder compared to the other monsters.
  • When Trees Attack: The Splinterlings and Mourning Wood.
  • Zerg Rush: The basic premise of the first few waves, before the Mourning Wood appears. After Wave 15, you can end up being zerged by the bosses.

Mourning Wood

An animated dead tree that first appears on Wave 4 of the Pumpkin Moon.

Pumpking

A cloaked figure with vines that end in scythes for arms, and a pumpkin for a head. He appears on Wave 7 of the Pumpkin Moon and is considered to be the boss of the event.
  • Call Back: Has some similarities to Skeletron, in that it is a floating body that attacks using two disembodied arms. However, Pumpking has some nasty tricks of its own, like firing large scythe-shaped projectiles at the player.
  • Sinister Scythe: Has two for arms.
  • Playing with Fire: Can conjure flaming scythes and also spit embers at you.
  • Power Floats: Constantly floats around the area, making it somewhat annoying to hit him.

     The Frost Moon 
The Frost Moon works similarly to the Pumpkin Moon, but features even more difficult enemies to deal with. Crafting and using the Naughty Present will make the player the target of an invasion by nightmarish Christmas-themed enemies: living Gingerbread men, Zombie Elves, Elf Archers, Nutcrackers, Yetis, Elf Copters and multiple Krampus. The Frost Moon also has three "boss" monsters with the Everscream, Santa-NK1 and the Ice Queen.
  • Nintendo Hard: The Lunar Events aside, this is the toughest event in the game yet.
  • Non-Human Undead: Zombie Elves.
  • Zerg Rush: The basic premise of the first few waves, before Everscream appears.

Everscream

An animated Christmas tree that first appears on Wave 4 of the Frost Moon.

Santa-NK1

A tank-like mecha with the appearance of Santa Claus carrying a Gatling gun and a rocket launcher. It appears on Wave 7 of the Frost Moon.
  • Backpack Cannon: It's used to fire presents that rain down on you.
  • Badass Santa: Like the other boss enemies in this event, he won't disappoint in terms of asskicking when he shows up.
  • Bad Santa: While Santa himself is not evil in Terraria, Santa-NK1 is a Santa-faced tank that tries to blast the player into bloody chunks with machine guns, rockets, and explosive presents.
  • Death from Above: Can make it rain down explosive presents on you.
  • Gatling Good: Carries an arm mounted Gatling gun, which he will fire upon you with sometimes.
  • Heavily Armored Mook: It has one of the highest defense ratings in the game.
  • Killer Robot: It's a Santa-based robot that attempts to massacre you with a huge arsenal.
  • Macross Missile Massacre: Carries a rapid missile launcher. Unlike the machine gun, the rockets can penetrate blocks.
  • Mini-Boss: Has less health than a boss-level enemy, but still a very formidable foe.
  • More Dakka: Carries a gatling gun. Can drop the chain gun which is faster
  • Skull for a Head: Damage it enough and its face is revealed to be similar to that of Skeletron Prime.

Ice Queen

A large, floating feminine figure that appears to be made of ice. She appears on Wave 11 on the Frost Moon and is considered to be the boss of the event.
  • An Ice Person: Quite literally by the looks of it. As well as the fact that almost all attacks she has mainly consist of spewing shards and waves of ice at her opponents.
  • Authority Equals Asskicking: She's an ice queen and she is an utter nightmare to face. As well as the fact that she is the deadliest enemy on the Frost Moon.
  • Dark Action Girl: When she appears it's a This Is Gonna Suck moment for some players as she is no slouch in her objective to put you down, sometimes succeeding as well. Even exceptional Terraria players sometimes find her a bit of a handful.
  • Everything's Better with Spinning: Can spin around to fire out a huge storm of shards.
  • Flechette Storm: Fires out loads of ice projectiles.
  • "Get Back Here!" Boss: The Ice Queen spends much of her time just offscreen using ranged attacks against you, occasionally swooping overhead before flying off again. She's only stationary for her icicle attack, which is fired in every direction.
  • God Save Us from the Queen!: She's presumably a queen of sorts, and is an incredibly nasty enemy and the boss of the Frost Moon.
  • Lightning Bruiser: The Ice Queen's power is surpassed only by how insanely fast she is. She also has more health than Plantera!
  • Power Floats: Constantly floats around the area, making it very annoying to hit her.
  • Standard Status Effects: Can cause you to get chilled or even frozen.
  • Tactical Suicide Boss: The Ice Queen is usually moving extremely fast, out of range from your attacks. However, once in a while she stops to throw you ice shards, giving you a chance to attack her.
http://tvtropes.org/pmwiki/pmwiki.php/Characters/Terraria