Abyss is an activated item added in .
The Binding of Isaac: Repentance
Effects [ ]
When used, destroys all items on item pedestals in the room and gives Isaac a unique red locust familiar for each item destroyed.
These locusts are permanent once created, except that there are a maximum of 64, after which creating more will replace older locusts.
The locusts loosely follow Isaac around and charge in the direction Isaac is firing until they hit an enemy, a wall, or certain obstacles like key blocks, dealing Isaac's damage per tick (3 times per second).
The locusts may gain additional effects depending on the item destroyed . 
Notes [ ]
In rooms where there are multiple items to choose from, using Abyss will give only one locust for each item choice/set.
If already at the maximum amount of locusts and presented with multiple non-choice item pedestals, using Abyss will only consume half of the pedestals.
starts with this item in the consumable slot.
Tainted Apollyon If he dies and is revived as another character (e.g. through ), that character will retain the locusts. Ankh If Abyss is used while Isaac is holding an item above his head, it can still consume the item and grant a locust.
Using Abyss to destroy items in Boss Rush or challenge rooms counts as taking the items and will cause waves of bosses or enemies to start spawning.
Special Locusts [ ]
/ 120 Volt : A pale blue, electric locust that is otherwise normal. Jacob's Ladder
: A red locust that deals double damage. Blood of the Martyr
: A gray, larger locust that is otherwise normal. Brimstone
/ The Common Cold / Scorpio : A green locust that poisons enemies. The Virus
: A red locust that is larger and deals triple damage. Cricket's Head
: An orange, burning locust that sets enemies on fire. Fire Mind
: Two gray locusts that deal half damage. Halo of Flies
: A cyan, glowing locust that occasionally calls down beams of light on enemies they hit that deal 3x Isaac's damage. Holy Light
: Three normal locusts. The Inner Eye
: A large, slow, green locust that deals x1.5 damage and poisons enemies. Ipecac
: Four normal locusts. Mutant Spider
: A yellow locust that is faster, deals damage more quickly, but has shorter range. Number One
: A purple locust that homes in on enemies. Spoon Bender : A purple locust that has a chance to drop a rune upon killing an enemy. Rune Bag
Synergies [ ]
/ BFFS! : Increases the locusts' size and damage by 25%.
Hive Mind These two items do not stack.
: Abyss can be used to absorb items without being kicked out of the area, allowing Isaac to instantly gain max locusts if used in a large room with enough items. Death Certificate : Electricity will flow between Isaac and the locusts. Extension Cord
Interactions [ ]
: Does not affect locusts. Baby-Bender
: Spawns black glowing fly wisps on the middle ring. The wisps have increased HP, but do not fire. The number of items destroyed does not change the wisps given. Book of Virtues
: Does not affect locusts. Box of Friends
: Locusts will only gain +2 damage from ipecac. Ipecac : Locusts can be sacrificed for items. Sacrificial Altar
Trivia [ ]
The way that Abyss works is similar to how it's described in the Book of Revelation, where locusts emerge from the Abyss and are controlled by Apollyon.
The swirl in
's appearance is in the opposite direction of Abyss's. Void The way the flies summoned by Abyss function is similar to the Flash Version of Isaac
Bugs [ ]
locusts.xml, 120 Volt and Jacob's Ladder locusts are supposed to cause electric arcs, and Ipecac locusts are supposed to explode. This never happens in game.
References [ ]
↑ Unique locusts and the items that give them are defined in
locusts.xml. There are 505 items listed in the file, but only the items mentioned actually have their locusts implemented.