Binding of Isaac: Rebirth Wiki

(in Afterbirth † and Repentance)

Book of the Dead is an unlockable activated item added in The Binding of Isaac: Afterbirth † (Booster Pack #5).

Effects[ | ]

  • When used, spawns one of the following for each enemy already killed in the current room:
  • This item belongs to the BookwormBookworm set. Collecting three items from this set will transform Isaac into Bookworm.

Notes[ | ]

  • Orbital bones deal contact damage equal to Isaac's damage at the time it was spawned and repel enemies that touch them.
    • (except in Repentance) They block 3 shots or deal 2 ticks of contact damage before being destroyed.
    • (in Repentance) They block 1 shot or deal 2 ticks of contact damage before being destroyed.
  • (except in Repentance) Bonies deal 5 contact damage and 5 damage with thrown bones.
  • (in Repentance) Bonies deal 8.7 contact damage and 6 damage with thrown bones.
  • Black Bonies will explode on death, dealing 40 damage to enemies it hits. The explosion will not hurt Isaac. (except in Repentance) It will knock him back.
  • Internally, the Book tracks up to 32 positions each enemy was killed at in the current room, and uses those locations as spawn points for bone orbitals and Bonies.
    • Using the book will always spawn at least 1, gives the rest a 66% chance for each location to spawn one, and can spawn up to 8 per use.
      • Having more locations than 8 will effectively increase the odds to spawn each.
      • If one of these locations doesn't spawn a bone orbital or Bony, it can still spawn one if the book is used in the same room without leaving. However, once a location spawns something, it cannot do so again.
  • Using the book in a room that had no enemies or was re-entered does nothing and expends the charge.
  • Orbital bones occupy the same area around Isaac as Blue Flies, meaning Isaac can have an incredibly dense ring of bone orbitals around him that nullifies most attacks.
  • Friendly monsters killed in the current room can also be used by Book of the Dead.
  • (except in Repentance) Destroying Black PoopBlack Poop will damage the friendly monsters acquired from this item.
  • (in Repentance) Frozen enemies (enemies killed by Collectible Uranus iconUranus, Collectible Cube Baby iconCube Baby, etc.) will not summon bone familiars unless their frozen bodies are shattered.

Synergies[ | ]

  • (in Repentance)Collectible Book of Virtues iconBook of Virtues: Spawns tiny skull wisps on the inner ring. The wisps fire bones and spawn friendly Bonies when destroyed. The book will summon wisps regardless of whether or not there were enemies killed in the current room.
  • Collectible Car Battery iconCar Battery: Gives a higher chance to spawn bone orbitals or friendly enemies, and can spawn up to 16 per use.

Interactions[ | ]

  • (in Repentance)Ace Cards: Friendly monsters are still affected by Ace Cards and enemies that are turned into pickups can't be animated.
  • Baby-BenderBaby-Bender: No effect.
  • (in Repentance)Collectible Blood Puppy iconBlood Puppy: Either angry version of Blood Puppy will target friendly enemies as well and can drag them along with it when it charges them. Blood Puppy cannot damage friendly enemies however friendly enemies can damage Blood Puppy despite not targeting it outright.
  • Collectible Broken Modem iconBroken Modem: Broken Modem also affects friendly enemies and projectiles created by them.
  • (except in Repentance) Collectible Contagion iconContagion: Poison effect can spread to and kill friendly BonyBonies.
  • Collectible E. Coli iconE. Coli/Collectible Flush! iconFlush!: Enemies that are turned into poop can't be animated.
  • (in Repentance)Collectible Eraser iconEraser: Bonies erased via Eraser will never spawn again from Book of the Dead, greatly decreasing its power.
  • (in Repentance) Collectible Ghost Bombs iconGhost Bombs / Collectible Hungry Soul iconHungry Soul / Collectible Purgatory iconPurgatory / Collectible Vade Retro iconVade Retro: Explosions from ghosts can and will kill Bonies.
  • Collectible Glowing Hourglass iconGlowing Hourglass: Each use of Glowing Hourglass that does not move Isaac to a different room than the one he is currently in (such as the starting room of a new floor) will duplicate friendly enemies and orbital bones. (This is possibly a bug)

In-game Footage[ | ]

Unlockable Achievements[ | ]

  • Mystery Egg
    Mystery Egg - Spawn three charmed enemies in the same room.

Gallery[ | ]

Trivia[ | ]

  • The Book of the Dead is a collection of ancient Egyptian funerary texts made out of papyrus, consisting of magic spells intended to assist a soul's journey through the Duat (underworld) and into the afterlife.
  • The quote "Rise from the Grave" is a reference to the beginning screen of the video game Altered Beast.
  • This item's effect may be a reference to the book of the dead from NetHack, which also summons multiple undead monsters around you.

Bugs[ | ]

Bug Bug! If sufficiently many bone orbitals are created, other familiars may disappear. Collecting a new familiar or resuming the run will restore the missing familiars.