Book of Secrets is an unlockable activated item.
- Gives the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor.
- Repeated use on the same floor might provide an effect already provided.
- It is possible to receive an effect of an item Isaac already has, effectively doing nothing.
- Book of Secrets cannot give mapping effects that Isaac already has. If he has every mapping effect active, Book of Secrets gives the effect of X-Ray Vision for that floor when used. If Curse of the Lost or an Amnesia pill is active on a floor, it will give the X-Ray Vision effect immediately.
- This item belongs to the Bookworm set. Collecting three items from this set will transform Isaac into Bookworm.
- The Mind: Immediately gives the X-Ray Vision effect for the floor upon use.
- This item may be a reference to an Apocryphon, or 'secret book'. This term is used to refer to early Christian writings that were written to teach 'secret knowledge' that wasn't allowed to be publicly taught.
- Prior to Repentance, this item's description was "??????"
PC ANVY YAPC (First floor Library)
PS4 2YVW FZ34 (Treasure Room adjacent to spawn)
Vita FHQG 1L9Y (First floor Treasure Room)
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