Binding of Isaac: Rebirth Wiki

Not to be confused with Collectible Satanic Bible iconSatanic Bible.

The Book of Belial is an activated item.

Effects[ | ]

  • Gives +2 damage for the current room.
  • (in Rebirth) Guarantees the Devil RoomDevil Room or Angel RoomAngel Room to spawn after killing a boss while holding it.
  • (except in Rebirth) Increases the chance to open the Devil RoomDevil Room or Angel RoomAngel Room after killing a boss by 12.5% while holding it.
  • (in Afterbirth † and Repentance) This item belongs to the BookwormBookworm set. Collecting three items from this set will transform Isaac into Bookworm.

Notes[ | ]

  • Character Judas iconJudas starts with this item by default.
  • (except in Repentance) While activated, switching items will end the bonus damage effect.
  • (except in Repentance) If the (in Afterbirth † and Repentance)Collectible Schoolbag iconSchoolbag and a second activated item are held, the book must be equipped in the primary slot to receive the Devil RoomDevil Room / Angel RoomAngel Room bonus.
  • (in Rebirth) Only guarantees Devil/Angel Rooms on floors that they can normally appear on, and, unlike Collectible Goat Head iconGoat Head, picking up The Book of Belial after killing the boss will not open the Devil/Angel Room door.
  • (except in Repentance) The damage bonus does not stack with multiple uses in the same room or with XV - The DevilXV - The Devil.
    • (in Repentance) Additional uses in the same room or combined with XV - The DevilXV - The Devil give +1 damage per use.

Synergies[ | ]

Interactions[ | ]

(in Repentance) Judas' Birthright Combinations[ | ]

While holding Collectible Birthright iconBirthright with Character Judas iconJudas or Character Dark Judas iconDark Judas, Book of Belial is able to be held alongside another active item, similarly to Collectible Book of Virtues iconBook of Virtues. The book provides +0.66 damage for each charge of the held item. Items that do not require charges to use do not grant a damage bonus unless there is an exception listed below.

Certain active items also gain additional effects, which are noted below; any items not listed have their standard effects aside from the temporary damage up Birthright gives them.

  • Collectible Alabaster Box iconAlabaster Box: Changes the payout to 2 Black HeartBlack Hearts and 1 item from the Devil Room item pool. If a Devil Deal has been taken, the payout is boosted to 3 Black Hearts and 2 Devil items.
  • Collectible Bag of Crafting iconBag of Crafting: Collecting Red HeartRed Hearts, Half Red HeartHalf Red Hearts or Double HeartDouble Hearts with this item has a chance to transform them into Black HeartBlack Hearts. When a heart is transformed in this way, a special sound plays and a black smoke puff appears. Does not work with Red HeartScared Hearts.
  • Collectible Blood Rights iconBlood Rights: Invokes the effect of Collectible Razor Blade iconRazor Blade along with its original effect.
  • Collectible Book of Virtues iconBook of Virtues: Can be stacked along with Book of Belial, allowing you to carry 2 passive books and an activated item on top of them.
  • Collectible Breath of Life iconBreath of Life: Judas leaves a damaging flame trail while the invincibility is active instead of creating beams of light. Blocking damage just as the invincibility begins deals heavy damage to all enemies in the room and grants Judas a temporary damage bonus.
  • Collectible Clicker iconClicker: Replaces the most recently acquired item with Collectible Pentagram iconPentagram instead of removing it. Birthright's effects will also change to that of the character transformed into.
  • Collectible Damocles iconDamocles: The sword also increases Judas' damage by x1.4 then a flat +1 while it's active.
  • Collectible Dark Arts iconDark Arts: Grants temporary damage ups for every enemy/projectile hit by Dark Arts, similarly to Character Tainted Judas iconTainted Judas. This stacks with Character Dark Judas iconDark Judas' inherent version of this, doubling the amount of damage gained.
  • Collectible Decap Attack iconDecap Attack: Grants Judas +2 damage and x3 tears fired per second while his head is detached from his body.
  • Collectible Forget Me Now iconForget Me Now: Grants +2 damage up for the entirety of the new floor.
  • Collectible Genesis iconGenesis: Grants a free Collectible Pentagram iconPentagram that will not be removed by Genesis.
  • Collectible Glass Cannon iconGlass Cannon: Grants Judas +2.67 damage up while Glass Cannon is broken.
  • Collectible Golden Razor iconGolden Razor: Also invokes the effect of Collectible Magic Fingers iconMagic Fingers when used, which occurs after the damage increase and deals an additional +5 damage; non-boss enemies killed by this effect also have a chance to drop 1-2 pennies.
  • Collectible Guppy's Paw iconGuppy's Paw: Grants a permanent 0.5 damage up for every converted heart.
  • Collectible How to Jump iconHow to Jump: Enemies Judas jumps through take 2 + 0.2 * floor contact damage and are set on fire. The burn deals damage equal to Judas' damage, and ticks up to 5 times.
  • Collectible Isaac's Tears iconIsaac's Tears: Fires a ring of 10 tears instead of 8, the tears are piercing and spectral, and the tears deal 1.4 * Judas' damage, plus a flat 5.
  • Collectible IV Bag iconIV Bag: Gives a temporary +0.66 damage up with each use.
  • Collectible The Jar iconThe Jar: Instead of dropping hearts on the floor, using The Jar consumes up to one full heart in the jar at a time, giving a temporary +0.66 damage up for each half heart consumed and spawning a puddle of red creep that deals 2 damage per tick (20 damage per second).
  • Collectible Jar of Wisps iconJar of Wisps: Will only spawn Collectible Satanic Bible iconSatanic Bible wisps that increase Judas' Devil RoomDevil Room chance by 10% for each one he has.
  • Collectible Kamikaze! iconKamikaze!: Invokes the effect of Collectible The Necronomicon iconThe Necronomicon effect along with the original effect.
  • Collectible Magic Fingers iconMagic Fingers: Also has a chance to invoke the effect of Collectible Golden Razor iconGolden Razor.
  • Collectible Magic Skin iconMagic Skin: Grants a permanent +0.5 damage up on use in addition to the temporary +4 damage up given to it by Birthright. This bonus is not lost if the broken hearts are removed.
  • Collectible Notched Axe iconNotched Axe: The axe receives a purplish glow and receives the following upgrades:
    • Increased durability: Each use of the axe has a very high chance not to use a charge.
    • Faster usage: The axe can be swung up to four times per second, regardless of Judas' tears stat.
    • Higher knockback: Enemies are knocked back when hit, receiving 8 + 0.2 * floor damage if they collide with a wall, obstacle, or other enemies.
    • Fire effect: The axe will set enemies on fire. The burn deals damage equal to Judas' damage, and ticks up to 5 times.
    • Increased luck: destroying obstacles with the axe has an increased chance to spawn pickups.
      • Destroying PoopPoops will spawn pickups much more frequently. When combined with Petrified PoopPetrified Poop, the chance becomes 100% and will often result in multiple pickups from a single poop.
      • Destroying Tinted Rocks will drop more consumables than usual, similarly to Super Special Rocks.
      • Destroying Props (such as Urns, Mushrooms, Skulls, and Polyps) gives the prop an extra chance to drop its rewards. This can result in a single prop giving multiple drops.
      • Destroying Fool's Gold rocks will drop significantly more coins.
  • Collectible Pandora's Box iconPandora's Box: In addition to the item's expected reward, spawns one of the following demonic familiars: Collectible Blood Puppy iconBlood Puppy, Collectible Dark Bum iconDark Bum, Collectible Demon Baby iconDemon Baby, Collectible Incubus iconIncubus, Collectible Lil Abaddon iconLil Abaddon, Collectible Lil Brimstone iconLil Brimstone, Collectible Succubus iconSuccubus, or Collectible Twisted Pair iconTwisted Pair.
  • Collectible Plan C iconPlan C: Respawns Judas as Character Dark Judas iconDark Judas if he has an extra life.
  • Collectible Potato Peeler iconPotato Peeler: Each use grants a permanent +0.5 normal damage up in addition to a +0.2 flat damage up.
  • Collectible Razor Blade iconRazor Blade: Invokes the effect of Collectible The Necronomicon iconThe Necronomicon effect along with the original effect.
  • Collectible Sacrificial Altar iconSacrificial Altar: Grants +10.8 temporary damage up for every sacrificed familiar. The damage bonus scales down to 0 over time, similarly to Collectible Red Stew iconRed Stew. Sacrificing blue flies or blue spiders has no special effect.
  • Collectible Sharp Key iconSharp Key: Invokes the effect of Collectible Razor Blade iconRazor Blade without dealing damage to Judas along with the original effect.
  • Collectible Stitches iconStitches: Creates a shadowy line similar to Collectible Dark Arts iconDark Arts between Judas and the familiar. Enemies caught in the line take damage equal to 2 * Judas' damage, plus a flat 3.
  • Collectible Urn of Souls iconUrn of Souls: The stream of fire is replaced with a controllable Collectible Brimstone iconBrimstone beam that destroys projectiles and deals more damage the longer it's active. The minimum damage is 3.37 + 0.361 * floor, and the maximum damage is 4.2 + 0.45 * floor, which it scales up to over the course of 3 seconds of continuous fire. Souls dropped from enemies are colored red, and the Urn displays a red graphic on the HUD when active.
  • Collectible Vade Retro iconVade Retro: Instead of exploding on the spot, souls home in on nearby enemies and explode on contact, similarly to Collectible Purgatory iconPurgatory. The souls deal 2 * Judas's damage up to 3 times and destroy projectiles.
  • Collectible Wavy Cap iconWavy Cap: Gives a damage bonus which lasts until the next floor equal to 0.2 * the maximum number of times Wavy Cap's effects have been stacked.

In-game Footage[ | ]

Gallery[ | ]

Trivia[ | ]

  • This item also increases the odds of getting an Angel RoomAngel Rooms even though it is a Satanic book.
  • It is one of the four books in the Satanic Bible.
  • Belial is a name used for Boss Satan ingameSatan in some Jewish and Christian texts.
  • (in Repentance) This item is used in Bloody Mary (Challenge #37).
  • (in Repentance) The previously unused item ID 59 is now occupied by the active/passive version of Book of Belial, which is obtained when Character Judas iconJudas or Character Dark Judas iconDark Judas has Collectible Birthright iconBirthright.
  • (in Repentance) The effect of Notched Axe with Character Judas iconJudas' and Character Dark Judas iconDark Judas' Birthright is a reference to Minecraft's enchanting mechanic.
    • All of its upgrades are based on existing Minecraft enchantments - Unbreaking, Fire Aspect, Knockback, Efficiency and Fortune.
    • However, Fire Aspect and Knockback normally cannot be applied to pickaxes in Minecraft, making it an odd choice for Notched Axe to have these buffs.