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Modeling Clay

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How do you unlock Modeling Clay?

In The Binding of Isaac, Modeling Clay is unlocked by earning the Mother completion mark as Tainted Eden.

Structured pathSource-backed requirements are mapped into trackable steps.

50% chance to grant the effect of a random passive Item each room.

Modeling Clay (Achievement)
- Tainted Eden → Mother (normal)
  1. Defeat Hush 3 times to unlock A Secret Exit. source
  2. After A Secret Exit is unlocked, a locked door to Downpour appears after completing Basement/Cellar/Burning Basement I or II. source
  3. Collect Knife Piece 1 in Downpour/Dross II. source
  4. Collect Knife Piece 2 in Mines/Ashpit II. source
  5. After defeating Mom in Mausoleum/Gehenna II, stab the flesh door that appears with the knife familiar to open it. source
  6. Defeat the Mausoleum version of Mom's Heart behind the flesh door, then reach Corpse II and defeat Mother. source
  - Tainted Eden

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What unlocking Modeling Clay leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13