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Book of the Dead

AchievementAfterbirth+Unlock unknown

Achievement details

Achievement number: 401
Description: Unlocked a new item.
Requirement: Defeat Delirium as The Forgotten

How do you unlock Book of the Dead?

In The Binding of Isaac, Book of the Dead is unlocked by earning the Delirium completion mark as The Forgotten (Character).

Structured pathSource-backed requirements are mapped into trackable steps.

Unlocked a new item.

The Forgotten (Character) → 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
- The Forgotten (Character)
  - The Forgotten (Achievement)
    How to unlock: It's complicated

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What unlocking Book of the Dead leads to

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13