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Decap Attack

AchievementRepentanceUnlock unknown

Achievement details

Achievement number: 598
Description: ???
Requirement: Defeat Delirium as Tainted Forgotten

How do you unlock Decap Attack?

In The Binding of Isaac, Decap Attack is unlocked by earning the Delirium completion mark as Tainted Forgotten.

Structured pathSource-backed requirements are mapped into trackable steps.

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Tainted Forgotten → Delirium (normal)
1. Defeat Hush to unlock The Void. source
2. A Void portal can appear after a major boss; defeating Hush guarantees one. source
3. Defeat Delirium, the main boss of The Void. source
- Tainted Forgotten
  - The Fettered
    How to unlock: Use Red Key (etc.) to open the hidden closet in Home as The Forgotten

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What unlocking Decap Attack leads to

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13