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Book of the Dead item
Book of the Dead is an unlockable active item in The Binding of Isaac, added in the Afterbirth+ DLC.
Description
Spawns one of the following for each enemy killed in the current room:
• Orbital bone familiar (very common).
• Friendly Bony (uncommon).
• Friendly Bone Fly (uncommon).
• Friendly Black Bony (rare).
• Friendly Revenant (rare - more common in Mausoleum, Gehenna, Sheol, and Dark Room).
Spawning a different enemy other than a Bony is only possible after dying at least once to said enemy on the save file.
Note
This page shows information as of the latest Repentance release.
To see latest up-to date information about this item for the new Repentance+ (Online Co-op) DLC, check this page instead.
How to unlock?
Defeat Delirium as The Forgotten.
Transformations
Item pools
Book of the Dead can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
| Devil Room |
1.0/1.0
|
| Library |
1.0/1.0
|
| Greed Treasure Room |
1.0/1.0
|
| Greed Devil Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| book | Contributes towards the Bookworm transformation. |
| offensive | Can appear for  Tainted Lost. |
Special synergies
The following special synergies and interactions for Book of the Dead have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues | Spawns skull wisps in the inner ring that fire bones and spawn friendly Bonies when destroyed. Has a 33% chance to spawn a Black Bony instead of a regular one. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
Slipped Rib 
Hallowed Ground 
Pointy Rib 
Dad's Ring 
Divorce Papers 
Jaw Bone