In-game pickup line
“Temporary invincibility”
Mechanics
What Book of Shadows does
- Using the book protects Isaac from damage for about ten seconds.
- The protection is temporary and ends even if the room is still active.
From the game files
Recharge
Standard recharge3 room clears
Standard room-clear recharge. Batteries and other effects can change how quickly it refills.
In a run
Practical note
Save a charge for a dangerous room or a boss phase when avoiding hits is difficult.
Reference
Game data and sources
The item ID, quality and pool listings, icon, game-file tags, and short pickup line come from the extracted Repentance files. This effect explanation is an editorial summary checked against the references below. Repentance+ can differ. Charge and pickup values shown above also come from the extracted items.xml.
