Book of Secrets

6  rooms

Library Secret Room Treasure Room Library

(page 3, column 2, row 3)(page 3, column 2, row 9)

Defeat Satan as EdenBook of Secrets

Book of Secrets is an unlockable activated item.

Effect

• Upon use, gives the effect of Treasure MapReveals all rooms for every floor. However, it does not reveal icons or secret rooms., The CompassReveals all special rooms (except secret rooms of any kind)., or Blue MapShows secret and super secret room locations on the map. for the duration of the current floor.

Notes

• It is possible to receive an effect of an item Isaac already has, therefore effectively doing nothing.
• Does not have any effect on floors affected by Curse of the Lost or an Amnesia Pill.

Gallery

• 

   3DS  The icon of Book of Secrets as seen on the lower 3DS screen.

Trivia

• 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.

Seeds

 PC  ANVY YAPC (First floor library)

 PS4  2YVW FZ34 (Treasure room adjacent to spawn)

 Vita  FHQG 1L9Y (First floor treasure room)

Book Items

• Anarchist CookbookSpawns six troll bombs around the room.
• The BibleUpon activation, Isaac gains flight, allowing him to pass over all obstacles in the current room. Instantly kills Mom, Mom's Heart, and It Lives when activated, but will kill Isaac when activated while fighting Satan.
• The Book of BelialUpon use increases damage by 2 for the current room and by a further +50% if the character also has the Blood of the Martyr.
  Guarantees a Devil Room or Angel Room will be open after beating a boss while holding it, or increases the chance by 12.5%.
• Book of the DeadUpon use, spawns a friendly Bony or an orbital bone for each enemy killed in the current room.
• Book of RevelationsAdds 1 soul heart, increases the chance for a Devil or Angel Room to appear, and increases the chance for the next boss to be a Horseman (except on XL floors and floors with fixed bosses such as Mom).
• Book of SecretsUpon use, gives the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor.
• Book of ShadowsUpon use, creates a protective shield nullifying all types of damage for 10 seconds.
• The Book of SinSpawns a random pickup, pill, card, or trinket.
• How to JumpGives Isaac the ability to jump (over gaps, spikes, etc.).
• Monster ManualSummons a random familiar for the current room. Can summon familiars not yet unlocked.
• The NecronomiconDamages all enemies in the room significantly.
• Satanic BibleUpon activation, Isaac gains a black heart.
• Telepathy for DummiesUpon activation, grants homing tears for the current room.

Eden Unlocks
Blank CardDefeat Isaac as EdenBook of SecretsDefeat Satan as EdenMysterious PaperBeat ??? as EdenMystery SackDefeat The Lamb as EdenUndefinedComplete the Boss Rush as EdenGlitch BabyDefeat Mom's Heart on hard mode as Eden	Eden's BlessingDefeat Hush as EdenGB BugDefeat Ultra Greed as EdenYellow BabyDefeat Mega Satan as EdenCracked BabyEarn all hard mode completion marks as Eden	Eden's SoulDefeat Delirium as EdenMetronomeDefeat Ultra Greedier as Eden