Item: Black Hole
Box of Friends
Upon use, duplicates all of Isaac's familiars for the current room.
Upon activation, Isaac gains a black heart.
Monstro jumps onto a random enemy, doing area damage. Can damage/kill the player if summoned in an room without enemies.
Damages all enemies in the room significantly.
Allows Isaac to re-roll collectible items in the current room into other items, depending on the current room's Item Pool.
Book of Secrets
Upon use, gives the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor.
Upon use, sacrifices up to 2 familiars and spawns an item from the Devil Room Pool for each familiar sacrificed.
Throws out a blue flame that can pass over gaps (but not through rocks). The flame damages anything in its path.
Spawns a trapdoor that leads to the next floor upon activation. Unlocks The Forgotten when used on a mound of dirt that appears in The Dark Room.
Displaces enemy sprites for the current room and increases or decreases a random stat.
Throwing the ball at an enemy instantly kills it and captures it. The captured enemy can later be released and will be charmed until it dies, persisting between floors.
Upon use, spawns a random item from the current room's item pool, with a chance to spawn A Lump of Coal or The Poop instead.
Upon use, deals one heart of damage to Isaac and grants +1.2 damage for the current room.
Shoots 8 tears around Isaac, which retain the damage, shot speed, and special effects of his tears. Each tear shot by Isaac increases item charge by one.
Damages all enemies in the room and slows them and their projectiles down.
When at full health, up to 4 extra hearts can be stored in the jar.