Binding of Isaac: Rebirth Wiki

Monster Manual is an activated item.

Effects[ | ]

When used, a random familiar will be spawned from the following:

  • (except in Repentance) Familiars spawned by Monster Manual last for the current room.
  • (in Repentance) Familiars spawned by Monster Manual last for the rest of the floor.
  • Familiars generated by Monster Manual do not contribute toward transformations.
  • (in Afterbirth † and Repentance) This item belongs to the BookwormBookworm set. Collecting three items from this set will transform Isaac into Bookworm.

Notes[ | ]

  • It can spawn familiars not yet unlocked.
  • If Collectible Cube of Meat iconCube of Meat or Collectible Ball of Bandages iconBall of Bandages are spawned and Isaac already has either of those items, the level of these items will increase while the effect is active.
  • Using Monster Manual is a good method to unlock achievements related to Super Meat Boy and Super Bandage Girl.
    • Using Monster Manual and enough Lil' BatteryLil' Batteries, Super Meat Boy and Super Bandage Girl can both be achieved in the same run.
    • If Isaac does not already have the Cube of Meat or Ball of Bandages, Monster Manual can spawn a level 2 Cube of Meat or Ball of Bandages in one use.
  • Collectible Mongo Baby iconMongo Baby will not copy familiars spawned by Monster Manual.
  • Familiars spawned by Monster Manual cannot be rerolled into other items by Collectible D4 iconD4 or Collectible D100 iconD100.
  • (except in Rebirth)Collectible Box of Friends iconBox of Friends will not duplicate familiars spawned by Monster Manual.
  • (in Repentance)Collectible Tinytoma iconTinytoma orbitals will persist between floors until they are all destroyed. They will not respawn outside of the floor they were generated in.
  • (in Repentance) The familiars summoned by Monster Manual are items with a monstermanual item tag.
  • (in Repentance) Character Tainted Lazarus iconTainted Lazarus: If dead Tainted Lazarus has used Monster Manual, but living Tainted Lazarus progresses to the next floor (or vice versa), familiars from the previous floor are not removed. Upon exiting the game, or moving to the next floor as either character, any familiars retained this way are lost, meaning familiars cant be kept at most 1 extra floor.

Synergies[ | ]

Interactions[ | ]

  • (in Repentance)Collectible Sacrificial Altar iconSacrificial Altar: Summoned familiars can be sacrificed since they persist for the entire floor, even if Monster Manual isn't currently being held.

In-game Footage[ | ]

Trivia[ | ]

  • In the original The Binding of Isaac, due to a typing error this item was called "Monster Manuel". This has been corrected for Rebirth.
    • (in Repentance) Monster Manual may sometimes display the misspelled name when picked up.
  • Monster Manual is a direct reference to Dungeons & Dragons. Its appearance in the game closely resembles the Advanced Dungeons & Dragons First Edition Monster Manual.

Gallery[ | ]

Bugs[ | ]

Bug Bug! (in Repentance) Monster Manual will fail to spawn a familiar if it attempts to spawn Halo of Flies.