Key Bum

Key Bum is an unlockable passive item added in Afterbirth.

Effects

 * Spawns a familiar that follows Isaac around and collects keys, dropping random Chests in return.

Interactions

 * : Familiar is bigger and drops chests more often.
 * : Familiar will stay in place relative to Isaac.
 * : Familiar will occasionally be connected to Isaac via electricity.

Seeds
WJK1 9R0Z (Treasure Room adjacent to spawn)