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Book of Secrets item
Book of Secrets is an unlockable active item in The Binding of Isaac.
Description
Activates one of the following map effects: Treasure Map, The Compass or Blue Map, for the duration of the current floor.
Highlights any tinted rocks and rocks with a crawl space in the room.
Cannot give effects that are already activated via any means.
If all of the effects are already active, it will provide X-Ray Vision for the current floor, opening all secret room entrances.
If used on a floor with Curse of the Lost active, it will immediately grant the X-Ray Vision effect.
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?
Defeat Satan as Eden.
Transformations
Item pools
Book of Secrets can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
| Secret Room |
1.0/1.0
|
| Library |
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 Secrets have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues | Spawns question-mark-looking wisps in the middle ring. These wisps invoke the effect of  Cracked Orb when destroyed. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
D4 
D10 
Blank Card 
Box of Spiders 
Red Candle 
The Jar