The Binding of Isaac Wiki

Lost Fly

Lost Fly


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Spawns fly familiar that moves in a straight line and circles around the first wall or obstacle it hits, dealing 105 damage per second on contact.


"Lost protector"


  • Spawns a fly familiar that moves in a straight line and attaches itself to the first wall or obstacle it comes into contact within each room.
    • The Lost Fly will then move around the room functionally similar to the Guts.
  • If any enemies walk into its path, it will deal 7 contact damage per tick or 105 damage per second.
  • If the obstacle it is attached to is destroyed then it will continue rolling in the direction it was previously traveling until it meets another wall or obstacle.

Found in

  • Baby Shop
  • Key Master
  • Treasure Room
  • Treasure Room (Greed Mode)


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