Book of Secrets
Effect
- Randomly adds the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor.
- (Added in Repentance) If all effects are active, X-Ray Vision is provided for the floor instead.
- Repeated activations will continue to add the other items' effects.
- (Removed in Repentance) The chosen effect on activation may be one that Isaac already has - effectively doing nothing.
- (Added in Repentance) Book of Secrets cannot give mapping effects that Isaac already has (whether from a previous activation or through possessing the equivalent item). After all effects have been given, further activations do nothing.
- (Added in Repentance) Reveals rocks with (Crawl Space) Crawl Spaces in a room with one.
- (Added in Afterbirth †) This item belongs to the Bookworm set. Collecting three items from this set will transform Isaac into Bookworm.
Notes
Synergies
- (Added in Repentance) Book of Virtues: Spawns wisps in the middle ring, looking like tiny spinning question marks. The wisps invoke the effect of Cracked Orb when destroyed.
- (Added in Repentance) The Mind: Immediately gives the X-Ray Vision effect for the floor upon use.