The Book of Belial

The Book of Belial is an unlockable activated item.

A gray book with an inverted pentagram on its cover.

Effects

Upon activation, blood will run from Isaac's (now empty) eye sockets, and will also have a red Cross of St. Peter on his forehead. This adds 2 points of Damage for the current room.

In addition to its +2 base damage modifier, if Isaac holds Blood Of The Martyr (without also having Max's Head or Magic Mushroom), the book gives a 1.5x damage multiplier.

Increases the chance of a Devil Room spawning by 25%.

Notes

Judas starts the game with this item.

Synergies

As with most activated items, items such as Habit, 9 Volt and The Battery decrease the charge time, increasing the effectiveness of this item.
This item's effect works with tear-changing effects such as Mutant Spider, The Inner Eye, Technology, Technology 2, Mom's Knife and Brimstone.
Blood Of The Martyr - Damage is multiplied by 1.5 in addition to the normal +2 if Isaac possesses this item without also having Max's Head or Magic Mushroom.

Gallery

Trivia

In the Dead Sea Scrolls, (not to be confused with the item of the same name) Belial is the leader of the Sons of Darkness.
During development, there was an item known as Satanic Bible. It later evolved into the Book Of Belial.
- The Book of Belial is the third book of The Satanic Bible, and describes magic rituals.
XV The Devil shares its effect with this item and does not stack with the Book of Belial.
The upside down pentagram on the book is a widely known satanic ritual symbol.

Items
Passive Items
The Sad Onion • The Inner Eye • Spoon Bender • Max's Head • My Reflection • Number One • Blood of the Martyr • Brother Bobby • Skatole • Cube of Meat Halo Of Flies • 1UP • Magic Mushroom • The Virus • Roid Rage • Less Than Three • Raw Liver • Skeleton Key • A Dollar • A Quarter Boom! • Transcendence • The Compass • Lunch • Dinner • Dessert • Breakfast • Rotten Meat • Wooden Spoon • PHD The Belt • Mom's Underwear • Mom's Heels • Mom's Lipstick • Wire Coat Hanger • Rosary • XRay Vision • Lucky Foot • Cupid's Arrow • Steven Pentagram • Dr. Fetus • Magneto • Treasure Map • Mom's Eye • Distant Admiration • Wiggle Worm • The Ladder • Charm Of The Vampire • The Mark The Battery • Steam Sale • Sister Maggy • Technology • Chocolate Milk • Growth Hormones • Mini Mushroom • The Pact • Dead Cat • Lord Of The Pit Loki's Horns • Little Chubby • Spider's Bite • Small Rock • Spelunker Hat • Super Bandage • Sack Of Pennies • Robo-Baby • Little C.H.A.D. • The Relic Little Gish • Little Steve • The Halo • The Common Cold • The Parasite • Mr. Mega • The Wafer • Money Equals Power • Mom's Contacts • Guardian Angel Demon Baby • Mom's Knife • Ouija Board • 9 Volt • Dead Bird • Brimstone • Blood Bag • Odd Mushroom (Thin) • Odd Mushroom (Large) • Whore Of Babylon Bobby-Bomb • Forever Alone • Bucket Of Lard • Bomb Bag • A Lump of Coal Wrath of the Lamb Guppy's Tail • Stigmata • Mom's Purse • Bob's Curse • Pageant Boy • Scapular • Speed Ball • Bum Friend • Infestation • IPECAC Tough Love • The Mulligan • Technology 2 • Mutant Spider • Chemical Peel • The Peeper • Habit • Bloody Lust • Spirit Of The Night • Ankh Celtic Cross • Ghost Baby • Cat-O-Nine-Tails • Harlequin Baby • Epic Fetus • Polyphemus • Daddy Longlegs • Sacrificial Dagger • Mitre • Rainbow Baby Stem Cells • Holy Water • Fate • The Black Bean • Sacred Heart • Tooth Picks • Holy Grail • Dead Dove • Guppy's Hair Ball • Abel SMB Super Fan! • Pyro • 3 Dollar Bill • MEAT! • Magic 8 Ball • Mom's Coin Purse • Squeezy • Jesus Juice • Box
Activated Items
The Bible • The Book of Belial • The Necronomicon • The Poop • Mr. Boom • Tammy's Head • Mom's Bra • Kamikaze • Mom's Pad • Bob's Rotten Head Teleport! • My Little Unicorn • Yum Heart • Doctor's Remote • Shoop Da Whoop! • Book Of Revelations • Lemon Mishap • Book of Shadows • Anarchist Cookbook • The Hourglass The Nail • We Need To Go Deeper! • Deck of Cards • Monstro's Tooth • The Gamekid • The Book Of Sin • Mom's Bottle of Pills • The Dice • The Pinking Shears • The Bean Monster Manuel • Dead Sea Scrolls • Razor Blade • Forget Me Now • A Pony Wrath of the Lamb Guppy's Paw • IV Bag • Best Friend • Remote Detonator • Guppy's Head • Prayer Card • Notched Axe • Crystal Ball • Crack The Sky • The Candle D20 • Spider Butt • Dad's Key • Portable Slot • White Pony • Blood Rights • Telepathy for Dummies