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Library Expanded
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The Book of All The Books item
The Book of All The Books is a passive item in Library Expanded, a mod for The Binding of Isaac.
Description
Improves the effects of other book items. Check the synergies section for more information.
Once per floor, completing a challenge room will award a book from the Library pool.
Transformations
Item pools
The Book of All The Books can be found in the following item pools:
| Name | Weight |
|---|---|
| Library |
1.0/1.0
|
| Greed Treasure Room |
0.2/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| book | Contributes towards the Bookworm transformation. |
| summonable | Can be summoned via  Lemegeton. |
| offensive | Can appear for  Tainted Lost. |
Special synergies
The following special synergies and interactions for The Book of All The Books have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Anarchist Cookbook | Spawns  Giga Bombs instead. |
| --- | Telepathy For Dummies | Homing lasts for the entire floor. |
| --- | The Book of Belial | Gives a passive permanent +0.1 damage up on use. |
| --- | Book of Revelations | Gives an additional  Half Soul Heart and a bonus item upon defeating a horseman. |
| --- | Satanic Bible | Gives an additional Half Black Heart and a bonus Devil Deal upon defeating the boss. |
| --- | Book of Secrets | Shows the location of the Ultra Secret Room and gives the effects of  Guppy's Eye for the duration of the room. |
| --- | Book of Shadows | Grants shielded tears for the room. |
| --- | The Book of Sin | Drops an additional pickup. |
| --- | Monster Manual | Gives  BFFS! on use, book is activated twice. |
| --- | Book of the Dead | Gives different bone-related items for the floor. |
| --- | Lemegeton | Additional activation. |
| --- | Book of Virtues | Additional wisp of the same type as the activated item. |
| --- | The Necronomicon | Converts an item and a trinket in the room into their respective missing page. Only works once for each. |
* Note that not all possible synergies and interactions are listed here.
External links
- Download Library Expanded from the Steam Workshop.
Regurgitated Book 
Book of Human Anatomy 
Key of Solomon