Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

Jaw Bone is an unlockable passive item added in The Binding of Isaac: Afterbirth † (Booster Pack #5).


  • Spawns a familiar that fires across the room in the direction of the first tear fired and returns to Isaac when it hits a wall, similar to Little Chubby Little Chubby. Deals a flat 7 damage to enemies that come in contact with it.
    • When thrown, the familiar will pierce through enemies if they are killed by the familiar, but the familiar will bounce back to Isaac if the enemy is not killed.
    • The familiar can pass through obstacles.
    • The familiar can retrieve pickups like The Boomerang The Boomerang.
    • Blocks enemy tears when stationary and when thrown.
    • After returning to Isaac, it has a short recharge time before it can be fired again.



  • BFFS! BFFS!: Familiar grows in size and does a flat 14 damage to enemies.
  • Duct Tape Duct Tape: Jaw Bone will face in the same direction as Isaac and remain stationary as opposed to trailing behind him. Jaw Bone can still be fired.

In-game Footage[]


  • This item is possibly a reference to Judges 15:16 where Samson kills a thousand men with a donkey's jaw bone.
  • Jaw Bone is possibly a reference to the movie, The Frighteners, where Judge chases a ghost hound who keeps stealing his jaw bone.