AI

The AI (or artificial intelligence) is the behavioral pattern exhibited by an NPC. For instance, the Caster AI will always warp, shoot three times, pause for three seconds, and then warp again. Knowing the AI an enemy uses can provide an advantage in combat, as it offers an idea of how the enemy will attack and react in given scenarios.

In addition, additional AI is added for certain NPCs, such as the non-aggressive mode of surface slimes, the Eater of Souls' circling around the player, the Wandering Eye's acceleration, and the ranged attack of some Fighter AI mobs.

There are 101 different AI types:

ID	Name	Description	NPCs
0	No AI	Doesn't move.	Bound Goblin, Bound Wizard, Bound Mechanic, Webbed Stylist, Sleeping Angler, Turkor The Ungrateful's Body, Dummy NPC
1	Slime AI	Hops in one direction, slides on slopes, floats in water, follows player if damaged or it's nighttime.	All Slimes (except King Slime), Hoppin' Jack, Grasshopper
2	Demon Eye AI	Flies, follows player, bounces off walls in an arc.	Demon Eye, Wandering Eye, The Hungry II (part of Wall of Flesh), Pigron
3	Fighter AI	Walks, jumps over holes, follows player. It will try to line up vertically first. If it fails to reach its target, it will back up a bit, then re-attempt.	Zombie, Skeleton, Undead Miner, Skeleton Archer, Angry Bones, Armored Skeleton, Goblin Scout, Goblin Archer, Corrupt Bunny, Crab, Werewolf, Clown, Chaos Elemental, Possessed Armor, Mummy, Template:Console icon Template:Mobile iconSpectral Elemental, Vampire, Vampire Miner, Frankenstein, Swamp Thing, Undead Viking, Corrupt Penguin, Face Monster, Snow Flinx, Nymph, Armored Viking, Lihzahrd, Icy Merman, Pirate Deckhand, Pirate Corsair, Pirate Deadeye, Pirate Crossbower, Pirate Captain, Cochineal Beetle, Cyan Beetle, Lac Beetle, Sea Snail, Ice Golem, Eyezor, Anomura Fungus, Mushi Ladybug, Rusty Armored Bones, Blue Armored Bones, Hell Armored Bones, Bone Lee, Paladin, Skeleton Sniper, Tactical Skeleton, Skeleton Commando, Scarecrow, Splinterling, Zombie Elf, Elf Archer, Gingerbread Man, Nutcracker, Yeti, Krampus
4	Eye of Cthulhu AI	Alternates between trying to stay above the player and summoning Servants of Cthulhu, and charging at the player occasionally. Spins when low health, and begins exclusively charging at the player. Always looks at player.	Eye of Cthulhu
5	Flying AI	Flies, looks at player, follows player.	Servant of Cthulhu, Eater of Souls, Corruptor, Hornet, Probe, Crimera, Moss Hornet, Moth, Bee, Parrot, Template:Console icon Template:Mobile icon Dragon Hornet, Template:Console icon Template:Mobile icon Servant of Ocram, Meteor Head
6	Worm AI	Burrows in ground, passes through blocks, follows player.	All parts of the following: Giant Worm, Devourer, Bone Serpent, Eater of Worlds, Digger, World Feeder, Wyvern, Template:Console icon Template:Mobile icon Arch Wyvern, Leech
7	Passive AI	Walks semi-randomly, jumps over holes. As of the 1.3 update, all Passive NPCs talk to eachother during the day and each NPC has a different weapon to defend themselves when an enemy is nearby.	All NPCs that move in to houses, Traveling Merchant, Old Man, Bunny, Penguin, Squirrel, Mouse, Frog, Scorpion, Black Scorpion
8	Caster AI	Casts spells at player, stays stationary, warps after three casts, warps if falling.	Fire Imp, Goblin Sorcerer, Dark Caster, Necromancer, Diabolist, Ragged Caster, Tim, Rune Wizard
9	Spell AI	Travels in a direct line toward player, going through blocks. Used by casters.	Burning Sphere, Chaos Ball, Vile Spit, Water Sphere
10	Cursed Skull AI	Tries to drift toward or around player, often stays a little bit out of reach once having touched the player.	Cursed Skull, Giant Cursed Skull, Template:Mobile icon/ Template:Console icon Dragon Skull
11	Head AI	Tries to stay above player, spins and moves towards player occasionally.	Skeletron Head, Dungeon Guardian
12	Skeletron Hand AI	Waves, damages player.	Skeletron Hand
13	Plant AI	Extends on a vine towards player, looks at player. Dies if not rooted to a block.	Snatcher, Man Eater, Clinger, Dragon Snatcher, Angry Trapper, Fungi Bulb, Giant Fungi Bulb
14	Bat AI	Spasmodically flies toward player.	Harpy, Cave Bat, Jungle Bat, Ice Bat, Lava Bat, Giant Flying Fox, Hellbat, Demon, Voodoo Demon, Giant Bat, Illuminant Bat, Slimer, Template:Mobile icon/ Template:Console icon Arch Demon, Red Devil, Vampire, Flying Snake
15	King Slime AI	Hops toward the player, releases Blue Slimes when damaged, occasionally teleports toward the player.	King Slime
16	Swimming AI	Swims back and forth, moves towards the player if they are in water.	Corrupt Goldfish, Piranha, Arapaima, Shark, Blood Feeder, Angler Fish, Template:Mobile icon/ Template:Console icon Orca
17	Vulture AI	Stands still until player gets within five blocks of AI or is damaged. AI then acts similarly to the Flying AI.	Vulture, Raven
18	Jellyfish AI	Floats back and forth, swims toward player in small bursts if player is in water.	Blue Jellyfish, Pink Jellyfish, Green Jellyfish, Squid, Blood Jelly, Fungo Fish
19	Antlion AI	Looks at player, climbs overlapping blocks, shoots at nearby players.	Antlion, Template:Mobile icon/ Template:Console icon Albino Antlion
20	Spike Ball AI	Swings in a circle from a pivot point on a chain.	Spike Ball
21	Blazing Wheel AI	Moves along the walls, floors and closed doors.	Blazing Wheel
22	Hovering AI	Similar to the Fighter AI, floats over the ground instead of jumping.	Wraith, Pixie, Gastropod, Spectral Gastropod, Ice Elemental, Floaty Gross, Reaper, Ichor Sticker, Ghost, Poltergeist
23	Flying Weapon AI	Doesn't adhere to gravity or tile collisions. Spins several times, then heads straight towards the player. Any knockback cancels its attack and forces it to spin again.	Cursed Hammer, Enchanted Sword, Template:Mobile icon/ Template:Console icon Shadow Hammer, Crimson Axe
24	Bird AI	Stands still until player gets nearby, then flies away. Avoids walls and obstacles and changes direction if one is in the way	Bird, Cardinal, Blue Jay
25	Mimic AI	Stands still until player approaches or attacks, then leaps towards them with varying heights.	Mimic, Present Mimic
26	Unicorn AI	Slowly gains speed while moving, jumps over obstacles.	Unicorn, Wolf, Hellhound, Headless Horseman
27	Wall of Flesh Body AI	Traverses the world horizontally. Spawns with two Wall of Flesh Eyes	Wall of Flesh Mouth
28	Wall of Flesh Eye AI	Bound to an entity, watches player, and shoots projectiles. The more damaged it is, the more it shoots.	Wall of Flesh Eye
29	The Hungry AI	Similar to the Plant AI, but attached to an entity.	The Hungry (part of Wall of Flesh)
30	Retinazer AI	Alternates between attempting to stay diagonally above player while shooting projectiles slowly, and attempting to stay beside player and shooting projectiles very rapidly.	Retinazer
31	Spazmatism AI	Alternates between shooting projectiles and staying beside player, and charging toward player.	Spazmatism
32	Skeletron Prime Head AI	Same as Head AI	Skeletron Prime
33	Prime Saw AI	Occasionally charges at the player, heads directly towards player when enraged.	Prime Saw
34	Prime Vice AI	Occasionally charges at the player, rapidly charges when enraged.	Prime Vice
35	Prime Cannon AI	Fires bombs upwards, aims directly at player when enraged.	Prime Cannon
36	Prime Laser AI	Fires projectiles at player, shoots very rapidly when enraged.	Prime Laser
37	The Destroyer AI	Similar to worm AI except shoot projectiles from the body and tail. It will also release Probes.	The Destroyer
38	Snowman AI	Jumps and runs toward the player, similar to Fighter AI.	Snowman Gangsta, Mister Stabby, Snow Balla
39	Tortoise AI	Crawls a bit, leaps toward player.	Giant Tortoise, Ice Tortoise, Giant Shelly, Sroller
40	Spider AI	Capable of climbing background walls as well as through platforms. Similar to Fighter AI when there is no background wall.	Black Recluse, Wall Creeper, Jungle Creeper, Blood Crawler
41	Herpling AI	Jumps high and attempts to land on the player. It can strafe to the sides in midair.	Herpling, Derpling
42	Lost Girl AI	Turns into a Nymph when a player gets too close.	Lost Girl
43	Queen Bee AI	Alternates between attempting to stay above player while firing projectiles downards, and charging back and forth very rapidly.	Queen Bee
44	Flying Fish AI	Flies straight towards player.	Flying Fish
45	Golem Body AI	Jumps towards player every few seconds, shoots lasers.	Golem
46	Golem Head AI	Bound to an entity.	Golem
47	Golem Fist AI	Flies towards player, returns when hit	Golem
48	Flying Golem Head AI	Attempts to fly back and forth, shoots projectiles at player,	Golem
49	Angry Nimbus AI	Attempts to stay directly above the player, and fires projectiles downwards.	Angry Nimbus
50	Spore AI	Drifts downwards while following player, destroyed on contact.	Fungi Spore, Spore
51	Plantera AI	Clings to nearby blocks, chases player, fires projectiles and spiky balls that bounce around.	Plantera
52	Plantera's Hook AI	Moves forward briefly before latching onto a block.	Plantera
53	Plantera's Tentacle AI	Acts very similar to the Plant AI, only bound to a certain entity.	Plantera
54	Brain of Cthulhu AI	Doesn't adhere to gravity or tile collisions, and teleports occasionally in first form. Once all Creepers are killed, it will begin rapidly teleporting and toward the player.	Brain of Cthulhu
55	Creeper AI	Circles around an entity, charging at player.	Creeper
56	Dungeon Spirit AI	Moves directly towards player, gaining momentum. Emits blue-ish particles.	Dungeon Spirit
57	Mourning Wood AI	Moves towards player, stops, and fires projectiles straight at the player.	Mourning Wood, Everscream
58	Pumpking AI	Very similar to the Head AI. Spawns with two Pumpking Scythes.	Pumpking
59	Pumpking Scythe AI	Very similar to the Hand AI.	Pumpking
60	Ice Queen AI	Flies around, shooting a barrage of ice-based projectiles.	Ice Queen
61	Santa-NK1 AI	Moves across the ground, stops moving, and launches many different types of projectiles.	Santa-NK1
62	Elf Copter AI	Attempts to fly around the player, shooting bullets rapidly if they are in sight.	Elf Copter
63	Flocko AI	Flies towards the player at high speed.	Flocko
64	Firefly AI	Flies slowly in any direction and occasionally glows.	Firefly, Lightning Bug
65	Butterfly AI	Flies slowly in any direction.	Butterfly
66	Passive Worm AI	Moves along the ground, pause for a bit, then continue moving. Will avoid walls and moves in the other direction if it has hit one.	Worm, Truffle Worm
67	Snail AI	Acts similarly to the Passive Worm AI, but climbs up walls instead of moving away.	Snail, Glowing Snail
68	Duck AI	Swims in water, or walks on land. Will fly when a player is nearby, landing after a while.	Duck, Mallard Duck
69	Duke Fishron AI	Rams player multiple times before summoning entities. In second form, it flies in circles and summons entities.	Duke Fishron
69	Lepus AI Template:Mobile icon	Jumps similarly to King Slime, Generates entities while on the ground.	Lepus
70	Detonating Bubble AI	Flies through the air, chases player, disappears after a period of time.	Detonating Bubble
71	Sharkron AI	Follows an arcing path, dies when it touches a wall or player.	Sharkron
72	Bubble shield AI	Created by the Martian Officer, absorbs all damage dealt to the officer.	Bubble Shield
73	Tesla Turret AI	Built by Martian Engineers on the ground.	Tesla Turret
74	Corite AI	Travells through blocks, charges at the player.	Corite
75	Rider AI	Has a Rider and a mount, when one is destroyed the other keeps attacking.	Drakomire Rider, Scutlix
76	Martian Saucer AI	Flies around the player, fires a Death ray straight down, can only be damaged if all four turrets have been destroyed.	Martian Saucer
77	Moon lord Core AI	Positions behind the player, invulnerable until the Moon lord's head and hands are defeated.	Moon Lord core
78	Moon lord Hand AI	Files to the left and right of the player, opens and closes, fires Phantasmal Spheres, Phantasmal Eyes, and Phantasmal Bolts. Spawns True eye of Cthuluhu when health is depleted.	Moon Lord Hand
79	Moon lord Head AI	Flies above the player, shoots a Phantasmal Deathray and then some Phantasmal Bolts, spawns True eye of Cthuluhu when defeated.	Moon Lord Head
80	Martian Probe AI	Floats at a constant height, turns red and files away if the player gets near it, triggers the Martian Madness event if it gets off screen.	Martian Probe
81	True Eye of Cthulhu AI	Flies around the Moon lord, shoots Phantasmal Sphere, Phantasmal Deathray, Phantasmal Eye and Phantasmal Bolts at the player.	True Eye of Cthulhu
82	Moon Leech Clot AI	Travels from the player to the Moon Lord's head, heals part of the Moon Lord for 1000 HP if it reaches the mouth.	Moon Leech Clot
83	Lunatic Devote AI	Never moves, causes the Lunatic Cultist to spawn when all are killed.	Lunatic Devote
84	Lunatic Cultist AI	Teleports around the player, fires shadow fireballs, ice mist, fireballs and lighting orbs. Creates duplicates of itsself and summons Phantasm Dragons and Ancient Visions, triggers Lunar events when defeated.	Lunatic Cultist
85	Star Cell/Brain Suckler AI	Flies around the player, slowly floats towards them. Usually sticks to the player.	Brain Suckler, Star Cell, Deadly Sphere
86	Ancient Vision AI	Summoned if duplicate Lunatic cultist is attacked if a Phantasm Dragon is still alive.	Ancient Vision
87	Unknown
88	Mothron AI	Flies through blocks, lunges at the player, occasionally lays a Mothron Egg.	Mothron
89	Mothron Egg AI	Doesn't move, spawns Baby Mothrons after a while.	Mothron Egg
90	Unknown
91	Granite Elemental AI	Floats towards the player, passing through tiles if the player is far enough. Drops to the ground when hurt in Expert mode.	Granite Elemental
92	Unknown
93	Flying Dutchman AI	Floats about the player, is defeated when all 4 cannons are destroyed.	Flying Dutchman
94	Celestial Tower AI	Bobs up and down in place, can only be damaged when 100 (normal), 150 (expert) of its event enemies are defeated. Triggers moon lord to spawn when all 4 are defeated.	Solar Pillar, Vortex Pillar, Nebula Pillar, Stardust Pillar
95	Small Star Cell AI	Remains stationary, eventually grows into a full sized star cell.	Star Cell (small)
96	Flow Invader AI	Floats around the player, summons 3 orbiting minions, fires projectiles at the player.	Flow Invader
97	Nebula Floater AI	Floats around the player, summons 3 orbiting minions, charges at the player and fires laser while teleporting.	Nebula Floater
98	Unknown
99	Spastic AI	Jumps around frequently in random directions pointing to the player.	Chattering Teeth Bomb
100	Ancient Light AI		Ancient Light
101	Ancient Doom AI	Spawned from Lunatic Cultist, fires 4 projectiles in a + shape when defeated/ summoned.	Ancient Doom

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