Book of the Dead

ItemAfterbirth+Locked

activeGame ID 545★★★★

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.

[Before Repentance] Creates a friendly Bony, Black Bony, or an orbital bone for each enemy killed in the current room. / [Repentance] Creates a friendly Bony, Black Bony, Bone Fly, Revenant, Big Bony, or an orbital bone for each enemy killed in the current room.

Book of the Dead (Achievement)
- 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)

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What unlocking Book of the Dead leads to

Nothing depends on this yet.

Source: bindingofisaacrebirth.wiki.gg

Imported 2026-09-13