Bookworm

Upon picking up 3 book items from the following list ( 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	Quote	Description	Quality
Anarchist Cookbook	5.100.65	Summon bombs	Spawns six Troll Bombs around the room.	0
Book of Revelations	5.100.78	Reusable soul protection	Increases the chance of a Devil Room / Angel Room appearing while held. Upon use, gives one Soul Heart, and replaces the boss of the current floor with a Harbinger if possible.	3
Book of Secrets	5.100.287	Tome of knowledge	Gives the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor. If all effects are active, X-Ray Vision is provided for the floor instead. Highlights any Tinted Rocks and rocks with Crawl Space in the room.	0
Book of Shadows	5.100.58	Temporary invincibility	Creates a protective shield, nullifying all types of damage in the current room for 10 seconds.	3
How to Jump	5.100.282	It's time you learned how	Isaac jumps in the direction he is currently moving, allowing travel over obstacles and enemies.	1
Monster Manual	5.100.123	Temporary buddy generator	Spawns a familiar from a specific selection for the current room. Spawns a familiar from a specific selection for the current floor.	1
Satanic Bible	5.100.292	Reusable evil... but at what cost?	Gives one Black Heart. Replaces the boss room item on the current floor with a Devil Deal.	3
Telepathy For Dummies	5.100.192	Temporary psychic shot	Gives homing tears for the current room. Also gives +3 range.	1
The Bible	5.100.33	Temporary Flight	Grants flight for the current room. Instantly kills Mom, Mom's Heart, and It Lives when activated, but kills Isaac when used on Satan.	1
The Book of Belial	5.100.34	Temporary DMG up	+2 damage for the current room. Passively guarantees a Devil Room or Angel Room will appear while held. +2 damage for the current room. Passively increases the chance of finding a Devil Room or Angel Room while held.	2
The Book of Sin	5.100.97	Reusable item generator	Spawns a random coin, heart, bomb, key, battery, pill or card near Isaac.	1
The Necronomicon	5.100.35	Mass room damage	Deals 40 damage to every enemy in the room.	0
Book of the Dead	5.100.545	Rise from the grave	Creates a friendly Bony, Black Bony, or an orbital bone for each enemy killed in the current room. Creates a friendly Bony, Black Bony, Bone Fly, Revenant, or an orbital bone for each enemy killed in the current room.	2
Lemegeton	5.100.712	Item summoner	Spawns a wisp representing a random passive item, which orbits Isaac but can be destroyed. While the wisp is alive, Isaac gains that item's effects. Generation uses the current room's item pool 25% of the time, otherwise a random pool.	3

Passive Collectibles[]

Name	ID	Icon	Quote	Description	Quality
Book of Virtues	5.100.584		Spiritual companionship	Spawns a destroyable orbiting wisp familiar that fires tears and deals contact damage. Also acts as a passive item that causes other active items to spawn themed wisps.	3

Notes[]

As Jacob and Esau / Tainted 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.
Unlike 20/20, the damage of doubled tears is not reduced. Each of the doubled tear shots does full damage.