Skip to content

26%

Polished Bone

TrinketRepentanceLocked

How do you unlock Polished Bone?

In The Binding of Isaac, Polished Bone is unlocked by earning every normal-mode completion mark as Tainted Forgotten.

Structured pathSource-backed requirements are mapped into trackable steps.

After clearing a room, adds a 25% chance to spawn a friendly Bony.

See the full unlock path for Polished Bone — 7 steps

Polished Bone (Achievement)
- All of
  - Tainted Forgotten → Isaac (normal)
  - Tainted Forgotten → ??? (normal)
  - Tainted Forgotten → Satan (normal)
  - Tainted Forgotten → The Lamb (normal)
    1. Defeat Satan 5 times to unlock The Negative. source
    2. The Negative is a guaranteed drop from Mom; take it, then defeat Satan in Sheol and touch the chest to enter Dark Room. source
    3. Find and defeat The Lamb in Dark Room. source

Show full path Show missing

What unlocking Polished Bone leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13