Binding of Isaac: Rebirth Wiki
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(in Repentance)

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

Effects[ | ]

  • After clearing a room, adds a chance to spawn a friendly BonyBony.
    • The chance can be increased, if multiple Polished Bones are held, e.g. from absorbing using Collectible Smelter iconSmelter, holding Collectible Mom's Box iconMom's Box, having a golden Polished Bone, or other methods.

Interactions[ | ]

  • Ace Cards: Friendly monsters are still affected by Ace Cards.
  • Collectible Blood Puppy iconBlood Puppy: Either angry version of Blood Puppy will target friendly enemies as well and can drag them along with it when it charges them. Blood Puppy cannot damage friendly enemies however friendly enemies can damage Blood Puppy despite not targeting it outright.
  • Collectible Broken Modem iconBroken Modem: Broken Modem also affects friendly enemies and projectiles created by them.
  • Collectible Eraser iconEraser: 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.
  • Collectible Ghost Bombs iconGhost Bombs / Collectible Hungry Soul iconHungry Soul / Collectible Purgatory iconPurgatory / Collectible Vade Retro iconVade Retro: Explosions from ghosts can kill friendly enemies.
  • Collectible Glowing Hourglass iconGlowing Hourglass: Each use of Glowing Hourglass that does not move Isaac to a different room than the one he is currently in (such as the starting room of a new floor) will duplicate friendly enemies. (This is possibly a bug)


Trivia[ | ]

  • 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.


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