Bookworm

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Transformations
(except in Rebirth and Afterbirth)

Upon picking up 3 book items from the following list ((in Repentance and Repentance+) 3 items with the book item tag), Isaac will fire tears out of both eyes simultaneously 25% of the time. This effect stacks with items such as 20/20, The Inner Eye and Mutant Spider, multiplying the number of tears.

The chance of firing double tears is not affected by Luck.

Activated Collectibles

Name ID Icon Quote Description (in Repentance and Repentance+) Quality
Anarchist Cookbook 5.100.65
Anarchist Cookbook3 rooms
Summon bombs
 Spawns six Troll Bomb.pngTroll Bombs around the room.
(except in Repentance+)
1
(in Repentance+)
0
The Bible 5.100.33
The Bible4 rooms
Temporary flight
 Grants flight for the current room. Instantly kills Boss Mom ingame.pngMom, Boss Mom's Heart ingame.pngMom's Heart, and Boss It Lives! ingame.pngIt Lives! when activated, but kills Isaac when used on Boss Satan ingame.pngSatan.
1
The Book of Belial 5.100.34
The Book of Belial3 rooms
Temporary DMG up
 (in Rebirth) +2 damage for the current room. Passively guarantees a Devil RoomDevil Room or Angel RoomAngel Room will appear while held.
(except in Rebirth) +2 damage for the current room. Passively increases the chance of finding a Devil RoomDevil Room or Angel RoomAngel Room while held.
2
Book of Revelations 5.100.78
Book of Revelations6 rooms
Reusable soul protection
 Increases the chance of a Devil RoomDevil Room / Angel RoomAngel Room appearing while held. Upon use, gives one Soul Heart.pngSoul Heart, and replaces the boss of the current floor with a Harbinger if possible.
3
Book of Secrets 5.100.287
Book of Secrets6 rooms
(except in Repentance and Repentance+)
??????
(in Repentance and Repentance+)
Tome of knowledge
 Gives the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor. (in Repentance and Repentance+) If all effects are active, X-Ray Vision is provided for the floor instead. Highlights any Tinted Rocks and rocks with Crawl SpaceCrawl Space in the room.
(except in Repentance+)
1
(in Repentance+)
0
Book of Shadows 5.100.58
Book of Shadows3 rooms
Temporary invincibility
 Creates a protective shield, nullifying all types of damage in the current room for 10 seconds.
3
The Book of Sin 5.100.97
The Book of Sin4 rooms
Reusable item generator
 Spawns a random coin, heart, bomb, key, battery, pill or card near Isaac.
(except in Repentance+)
2
(in Repentance+)
1
Book of the Dead 5.100.545
Book of the Dead6 rooms
Rise from the grave
 (except in Repentance and Repentance+) Creates a friendly Bony.pngBony, Black Bony.pngBlack Bony, or an orbital bone for each enemy killed in the current room.
(in Repentance and Repentance+) Creates a friendly Bony.pngBony, Black Bony.pngBlack Bony, Bone Fly.pngBone Fly, Revenant.pngRevenant, Big Bony.pngBig Bony, or an orbital bone for each enemy killed in the current room.
(except in Repentance+)
3
(in Repentance+)
2
How to Jump 5.100.282
How to JumpUnlimited
It's time you learned how
 Isaac jumps in the direction he is currently moving, allowing travel over obstacles and enemies.
1
The Necronomicon 5.100.35
The Necronomicon4 rooms
Mass room damage
 Deals 40 damage to every enemy in the room.
(except in Repentance+)
1
(in Repentance+)
0
Monster Manual 5.100.123
Monster Manual6 rooms
Temporary buddy generator
 (except in Repentance and Repentance+) Spawns a familiar from a specific selection for the current room.
(in Repentance and Repentance+) Spawns a familiar from a specific selection for the current floor.
1
Satanic Bible 5.100.292
Satanic Bible6 rooms
(except in Repentance and Repentance+)
Reusable evil
(in Repentance and Repentance+)
Reusable evil... but at what cost?
 Grants one Black Heart.pngBlack Heart. (in Repentance and Repentance+) Replaces the boss room item on the current floor with a Devil Deal.
(except in Repentance+)
4
(in Repentance+)
3
Telepathy For Dummies 5.100.192
Telepathy For Dummies2 rooms
Temporary psychic shot
 Gives homing tears for the current room. (in Repentance and Repentance+) Also gives +3 range.
1
(in Repentance and Repentance+) Lemegeton 5.100.712
Lemegeton6 rooms
Item summoner
 Spawns a destructible orbital familiar representing a random passive item, which blocks shots and deals contact damage. While the wisp is alive, Isaac gains that item's effects.
3

Passive Collectibles

Name ID Icon Quote Description (in Repentance and Repentance+) Quality
(in Repentance and Repentance+) Book of Virtues 5.100.584
Book of Virtues4 rooms
Spiritual companionship
 Passively causes active items to spawn themed orbital wisp familiars on use, which fire tears and block shots. Can be activated to spawn a basic wisp if Isaac has no other active item.
3

Notes

  • As (in Repentance and Repentance+) Character Jacob and Esau icon.pngJacob and Esau / (in Repentance and Repentance+) Character Tainted Lazarus icon.pngTainted Lazarus, it's not possible to cycle between three books to give both characters the transformation's effect. Each character needs to pick up three different books, meaning six books in total.
  • (in Repentance and Repentance+) Unlike 20/20, the damage of doubled tears is not reduced. Each of the doubled tear shots does full damage.

Trivia

  • A bookworm is a person who's devoted to reading, especially books.
  • (in Repentance and Repentance+)Book of Virtues is the only passive item to contribute to the transformation.
  • Bookworm can be very easily attained by going into a LibraryLibrary.
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