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Fighter AI is an AI type used by a variety of enemies. All Fighter AI enemies are able to open/break down doors, except Zombies, which are only able to do so during a Blood Moon, and the Psycho, who does not interact with doors at all.


An NPC with the Fighter AI exhibits the following behavior:

  • Directly chases the player
  • Jumps when necessary or if player is above them enough.
  • Navigates through platforms


  • A level piece of land is ideal for battling Fighters. A fast attacking or heavy knockback-inducing weapon is recommended. A magic weapon which can pierce through enemies multiple times (or indefinitely) is most effective when the player has all Fighters lined up.
  • As Fighter AI enemies always try to maintain the same height as their target, creating a large pit with a bridge of platforms (and then standing lower than this bridge) will cause Fighter AI enemies to fall right through it.
  • Many Fighter AI enemies are exceptionally vulnerable to Confuse.png Confused debuff, making them walk away from the player.
  • Most Fighter AI enemies can only have doors open away from them. They cannot open a door if it is obstructed by a background object (e.g. a workbench) on the opposite side.

List of NPCs with Fighter AI[]