Binding of Isaac: Rebirth Wiki

Added in Repentance

Bone Spurs is an unlockable passive item added in The Binding of Isaac: Repentance.


  • Enemies spawn 1-2 floating bones on death, which block enemy shots and damage/repel enemies that touch them.
    • Bones block 2 shots and/or deals 2 ticks of damage before breaking.
    • Bones deal contact damage equal to Isaac's damage in the moment they were created.
      • This means that if the damage stat was changed, the bones that were already present on the screen will use Isaac's old damage stat.


  • BFFS! BFFS!: Doubles the bones' size and damage.
  • Spin to Win Spin to Win: Boosts the bones' damage while spinning even though there's no visual tell of the effect.


Bug Bug! If switching between Tainted Lazurus and Dead Lazurus with the Flip item, there is a chance to spawn a mass amount of bone spurs on the place you flip each time you use the item.

In-game footage[]


  • A bone spur is a bony growth that often occurs close to joints and can have a multitude of causes from joint damage from osteoarthritis to excessive overuse of said joints.