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The Necronomicon item
The Necronomicon is an unlockable active item in The Binding of Isaac.
Description
Deals 40 damage to everything in the room.
A Missing Page and Missing Page 2 each add +40 to the damage, stacking up to 120 in total.
Note
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.
How to unlock?
Use XIII - Death 4 times.
Transformations
Item pools
The Necronomicon can be found in the following item pools:
| Name | Weight |
|---|---|
| Devil Room |
1.0/1.0
|
| Secret Room |
1.0/1.0
|
| Library |
1.0/1.0
|
| Greed Treasure Room |
1.0/1.0
|
| Greed Devil Room |
1.0/1.0
|
| Greed Secret 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 The Necronomicon have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues | Spawns black wisps on the inner ring. The wisps deal 40 damage to all enemies in the room when destroyed. |
| --- | Abyss | Grants a locust that has a 10% chance to trigger the Necronomicon effect upon enemy contact. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
Wire Coat Hanger 
The Bible 
The Book of Belial 
The Poop 
Mr. Boom 
Tammy's Head