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Mastema
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Book of Jubilees item
Book of Jubilees is an unlockable passive item in Mastema, a mod for The Binding of Isaac.
Description
Every 7th room cleared grants one of the following rewards:
• 7 
Pennies.
• A random heart.
• A random high-quality coin.
• A random high-quality heart.
• A Holy Mantle shield.
Every 49th room cleared grants the effect of sleeping in a bed.
Every 393rd room cleared spawns an item from a random pool.
How to unlock?
Defeat ??? as 
Mastema.
Transformations
Item pools
Book of Jubilees can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
0.5/1.0
|
| Angel Room |
0.5/1.0
|
| Library |
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. |
| nocantrip | Not available as card effects during the Cantripped! challenge. |
Special synergies
The following special synergies and interactions for Book of Jubilees have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Abyss | Gives 7 locusts that deal 7% of Isaac's damage and each has a chance to create a  Holy Light effect on damage. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the mod's external Wiki.
- Download Mastema from the Steam Workshop.
Raven Skull 
Infernal Covenant 
Broken Dice 
Mastema's Wrath 
Torn Wings 
Bloodsplosion