A familiar fly that moves in a straight line and attaches itself to the first obstacle or wall it comes into contact with in each room.
The Lost Fly will then move around the room functionally similarly 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 travelling until it meets another wall or obstacle.