Lost Fly

Lost Fly is a passive item added in the Binding of Isaac: Afterbirth expansion.

Effects

 * 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.
 * 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.