Binding of Isaac: Rebirth Wiki

Added in Repentance

Polished Bone is an unlockable trinket added in The Binding of Isaac: Repentance.


  • After clearing a room, adds a chance to spawn a friendly Bony Bony.
    • The chance scales with Luck, maxing at around ~50% at 51 luck.


  • Eraser Eraser: Bonies erased by Eraser will never spawn again, greatly diminishing the value of Polished Bone. If Black Bonies are also erased, Polished Bone becomes useless.


  • The namesake of this item most likely comes from the fact that "polishing one's bone" is sexual innuendo for male masturbation.
    • This is furthered by the fact that the item has a rather phallic shape and nature to it.