Binding of Isaac: Rebirth Wiki
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Binding of Isaac: Rebirth Wiki

The Caves is the second chapter of Rebirth. The Caves' unlockable variants are Catacombs Catacombs and the Added in Afterbirth Flooded Caves Flooded Caves. It features more decayed enemies than the first chapter, with the main theme being worms and boils.

Added in Repentance After A Secret Exit A Secret Exit is unlocked, a boarded door similar to the one leading to a Bedroom will appear in this floor's Boss Room Boss Room upon defeating the boss, leading to the Mines Mines / Ashpit Ashpit. This door, like a Bedroom, requires two bombs to be opened. Unlike Angel Room Angel Rooms and Devil Room Devil Rooms, this door never disappears.

Monsters[]

Entity ID Description
Boil
Boil
30.0 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires multiple short-ranged blood projectiles in random directions when fully swollen.
Gut
Gut
30.1 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires 15►Ipecac Ipecac shots in random directions when fully swollen.
Sack
Sack
30.2 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Occasionally spawns Spiders when fully swollen.
Walking Gut
Walking Gut
88.1 Does not shrink or regenerate. Walks around aimlessly and fires 15►Ipecac Ipecac shots in random directions.
Bony
Bony
227.0 Wanders around the room and throws a bone at Isaac when he is in sight.
Clotty
Clotty
15.0 Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
Clot
Clot
15.1 Randomly wanders around the room, firing 4 tar shots in the ordinal directions.
I.Blob
I.Blob
15.2 Randomly wanders around the room, firing 8 shots in all directions.
Dip
Dip
217.0 Slowly dashes in random directions, dealing contact damage.
Squirt
Squirt
220.0 Dashes towards Isaac and deals contact damage. Spawns 2 Dips upon death.
Embryo
Embryo
77.0 Aimlessly hops around the room, dealing contact damage.
Fatty
Fatty
208.0 Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away.
Pale Fatty
Pale Fatty
208.1 Slowly walks towards Isaac. Occasionally farts and shoots 6 blood shots in all directions. Has a chance to turn into a Blubber or Half Sack upon death.
Fat Sack
Fat Sack
209.0 Slowly walks towards Isaac. Occasionally leaps off-screen and attempts to land on Isaac, leaving a puddle of Red Creep and shooting 6 blood shots in all directions where it lands. Has a chance to turn into a Blubber or Half Sack upon death.
Blubber
Blubber
210.0 Walks around aimlessly and randomly spews a cluster of blood shots in all directions. Has a chance to turn into a Half Sack when killed.
Half Sack
Half Sack
211.0 Wanders around aimlessly and leaves a trail of Red Creep.
Fly
Fly
13.0 Hovers in place. Does not deal contact damage and is harmless but can turn into Pooters if they stay around Poop.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Ring Fly
Ring Fly
222.0 Gathers with any other Ring Flies in the room. These flies orbit around themselves while following Isaac. Deals contact damage.
Moter
Moter
80.0 Follows Isaac, similar to Attack Flies. Deals contact damage. Splits into 2 Attack Flies upon death.
Boom Fly
Boom Fly
25.0 Flies around the room diagonally, dealing contact damage. Explodes upon death.
Red Boom Fly
Red Boom Fly
25.1 Flies around the room diagonally, dealing contact damage. Creates a ring of 6 blood shots upon death.
Full Fly
Full Fly
249.0 Flies toward Isaac erratically, dealing contact damage. Releases 6 bullets in all directions upon death.
Pooter
Pooter
14.0 Slowly drifts toward Isaac, occasionally firing a single blood shot at him. Does not deal contact damage.
Super Pooter
Super Pooter
14.1 Slowly drifts toward Isaac, occasionally firing two blood shots in a V-formation at him. Does not deal contact damage.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Gurgle
Gurgle
87.0 Walks towards Isaac, firing Ipecac shots at him. Can turn into a Splasher upon death.
Skinny
Skinny
226.0 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself.
Rotty
Rotty
226.1 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself. Spawns a Bony or two Attack Flies upon death.
Globin
Globin
24.0 Chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into a pile of goo, which can be killed. Will regenerate after a short period of time if not killed quickly.
Gazing Globin
Gazing Globin
24.1 Quickly chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into a pile of goo, which will slide away from Isaac and can be killed. Will regenerate after a short period of time if not killed quickly.
Grub
Grub
239.0 Erratically moves around the room like Larry Jr. and charges at Isaac when he gets within its line of sight. Spawns Maggots, Chargers, or Spitties upon death, one for each of its segments.
Gurgling
Gurgling
237.0 Charges towards Isaac when he lines up with them, leaving a trail of Red Creep and shooting 6 blood shots.
Hopper
Hopper
29.0 Slowly hops around the room, doing contact damage. Can turn into a Flaming Hopper by jumping into fire.
Flaming Hopper
Flaming Hopper
54.0 Quickly hops around the room, doing contact damage. Covers a larger distance than the regular Hopper.
Leaper
Leaper
34.0 Hops around the room, doing contact damage. Occasionally jumps high into the air, dropping down onto Isaac's position while firing 4 blood shots in the cardinal directions.
Psychic Horf
Psychic Horf
248.0 Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
Host
Host
27.0 Stationary enemy that is normally invulnerable. Raises its head up when Isaac gets close, revealing a fleshy stem that can be damaged. Upon raising its head, it will fire 3 blood shots in a spread and lower its head again.
Red Host
Red Host
27.1 Stationary enemy that can be damaged even when its head is lowered. Fire 5 spread blood shots when it raises its head.
Mobile Host
Mobile Host
204.0 Acts like the Host, but follows Isaac and deals contact damage.
Flesh Mobile Host
Flesh Mobile Host
247.0 Acts like the Red Host, but follows Isaac and deals contact damage.
Knight
Knight
41.0 Moves erratically around the room and charges towards Isaac when in line of sight. Can only be damaged from behind.
Maggot
Maggot
21.0 Aimlessly moves around the room, dealing contact damage.
Charger
Charger
23.0 Slowly moves around the room, charging at Isaac when he gets in its line of sight.
Spitty
Spitty
31.0 Slowly moves around the room, occasionally firing a single blood shot forward.
Conjoined Spitty
Conjoined Spitty
243.0 Slowly moves around the room, occasionally firing a blood shot from both ends of its body.
Maw
Maw
26.0 Slowly floats towards Isaac, firing blood shots at him when he is in their range.
Red Maw
Red Maw
26.1 Floats towards Isaac and releases 4 blood shots in the cardinal directions upon death.
Psychic Maw
Psychic Maw
26.2 Slowly floats towards Isaac, firing homing shots at him when he is in their range. Spawns with an Eternal Fly orbiting around it.
Mr. Maw
Mr. Maw
35.0 Walks towards Isaac and attacks by launching its head towards him. Turns into a Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.
Hive
Hive
22.0 Wanders around the room, avoiding Isaac and spawning Attack Flies if he gets close. Spawns a large number of flies on death, which can be Flies, Attack Flies, and/or Pooters.
Nest
Nest
205.0 Wanders around the room, avoiding Isaac and spawning Spiders if he gets close. Spawns a Big Spider or Trite upon death.
Mulliboom
Mulliboom
16.2 Chases Isaac and explodes upon death or upon touching Isaac. The explosion deals a half-heart of damage instead of the regular full heart.
One Tooth
One Tooth
234.0 Follows Isaac and periodically dashes towards him when it gets close. Deals contact damage.
Splasher
Splasher
238.0 Walks aimlessly around the room, firing Ipecac shots in random directions.
Round Worm
Round Worm
244.0 Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.
Night Crawler
Night Crawler
255.0 Pops out of the ground in random locations and fires four short-range shots that spiral outwards if Isaac is in sight.
Spider
Spider
85.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage.
Big Spider
Big Spider
94.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage. Spawns two Spiders upon death.
Ticking Spider
Ticking Spider
250.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances. Explodes upon death.
Trite
Trite
29.1 Quickly leaps towards Isaac and deals contact damage.
Ragling
Ragling
246.0 Quickly leaps towards Isaac and deals contact damage. Randomly shoots two purple shots that orbit around it.
Buttlicker
Buttlicker
89.0 Can start Attached to other Buttlickers and erratically moves around the room, similar to Larry Jr..
Baby Long Legs
Baby Long Legs
206.0 Runs away from Isaac and frequently spawns Spiders.
Small Baby Long Legs
Small Baby Long Legs
206.1 Runs away from Isaac and occasionally spawns Sacks.
Crazy Long Legs
Crazy Long Legs
207.0 Chases Isaac, dealing touch damage. Occasionally stops to spit 8 blood shots in all directions.
Small Crazy Long Legs
Small Crazy Long Legs
207.1 Chases Isaac, dealing touch damage. Occasionally stops to spit 4 blood shots in the diagonal directions.
Wall Creep
Wall Creep
240.0 Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Blind Creep
Blind Creep
242.0 Randomly crawls along walls and shoots three spread blood shots.
Swarmer
Swarmer
91.0 Slowly floats around the room, spawning several Attack Flies. Spawns Pooters upon taking damage. Spawns a Boom Fly upon death.
Tumor
Tumor
229.0 Moves around the room diagonally, occasionally firing 6 blood shots in all directions. Fires more often upon getting damaged.
Stone Grimace
Stone Grimace
42.0 Stationary and invulnerable monster that occasionally fires a blood shot at Isaac. Stops firing when room is cleared.
Constant Stone Shooter
Constant Stone Shooter
202.0 Stationary and invulnerable monster that continuously fires shots in a single direction.
Gaping Maw
Gaping Maw
235.0 Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles.
Slide
Slide
44.1 Quickly slides towards Isaac when he gets in its line of sight, then moves slowly back to its original position. Cannot be destroyed.
Blue Boil
Blue Boil
Added in Afterbirth
298.0 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires 1-3 blood shots towards Isaac when fully swollen.
Corn
Corn
Added in Afterbirth
217.1 Quickly dashes in random directions, dealing contact damage.
Dank Squirt
Dank Squirt
Added in Afterbirth
220.1 Dashes towards Isaac and deals contact damage, creating slowing black creep. Spawns 2 Clots upon death.
Dark Ball
Dark Ball
Added in Afterbirth
404.1 Floats towards Isaac, doing contact damage.
Corn Mine
Corn Mine
Added in Afterbirth
295.0 Goes off when destroyed or after some time, then releases a cloud of poisonous gas and fires corny shots in eight directions.
Swarm Fly
Swarm Fly
Added in Afterbirth
281.0 Follows Isaac in large, tightly-clustered groups and deals contact damage.
Dart Fly
Dart Fly
Added in Afterbirth
256.0 Flies towards Isaac and attempts to predict his movements. Deals contact damage.
Blue Gaper
Blue Gaper
Added in Afterbirth
297.0 Walks towards Isaac, dealing contact damage.
Greed Gaper
Greed Gaper
Added in Afterbirth
299.0 Walks towards Isaac, dealing contact damage.
Conjoined Fatty
Conjoined Fatty
Added in Afterbirth
257.0 Slowly walks towards Isaac. Occasionally pauses to fart out a line of damaging Green Creep towards Isaac. Chance to turn into a regular Fatty upon death.
Dukie
Dukie
Added in Afterbirth
288.0 Flies around the room diagonally, occasionally spitting out 1-2 Dart Flies.
Fat Bat
Fat Bat
Added in Afterbirth
258.0 Slowly flies towards Isaac. Tries to align itself diagonally to Isaac and shoots at him when in that alignment.
Roundy
Roundy
Added in Afterbirth
276.0 Pops out of the ground in random locations, creating a small rock wave. Fires an explosive Ipecac shot at Isaac if he is in sight.
Ulcer
Ulcer
Added in Afterbirth
289.0 Pops out of the ground in random locations and spawns a Dart Fly if Isaac is in sight. Fires a blood shot after spawning 6 Dart Flies.
Stoney
Stoney
Added in Afterbirth †
302.0 Chases Isaac and blocks tears, but does not deal contact damage. Temporarily pauses in exhaustion after a certain amount of time. Invulnerable; dies when the room is cleared.
Ministro
Ministro
Added in Afterbirth †
305.0 Hops towards Isaac, occasionally spitting out a cluster of disorganized shots.
Mushroom
Mushroom
Added in Afterbirth †
300.0 Stationary enemy that occasionally pops up and fires four shots in the cardinal or diagonal directions. Takes less damage while its head is down.
Portal
Portal
Added in Afterbirth † / Removed in Repentance
306.0 Spawns various enemies from the current floor until it either vanishes or is killed.
Army Fly
Army Fly
Added in Repentance
868.0 Chases Isaac, moving along the cardinal directions. Forms a line with other Army Flies in the room. Deals contact damage.
Bulb
Bulb
Added in Repentance
61.5 Flies in erratic, angled movements toward Isaac if his active item has charges. Drains active item charges instead of dealing damage.
Needle
Needle
Added in Repentance
881.0 Pops out of the ground and lunges towards Isaac, dealing contact damage.

Degraded Bosses:

Name ID Notes
Blastocyst
Blastocyst
74.0 Small-form only
Fistula
Fistula
71.0 Small- and Medium-form only
The Hollow
The Hollow
19.1
Larry Jr.
Larry Jr.
19.0

Bosses[]

Boss Chub portrait.png
Boss Dark One portrait.png
Boss Gurdy portrait.png
Boss Gurdy Jr. portrait.png
Chub Dark One Removed in Repentance Gurdy Gurdy Jr.
Boss Mega Fatty portrait.png
Boss Mega Maw portrait.png
Boss Peep portrait.png
Boss The Fallen portrait.png
Mega Fatty Mega Maw Peep The Fallen Devil Room Icon.png
Boss C.H.A.D. portrait.png
Boss The Headless Horseman portrait.png
Boss Pestilence portrait.png
Boss The Forsaken portrait.png
C.H.A.D. Needs to be unlocked The Headless Horseman Needs to be unlocked Pestilence Needs to be unlocked The Forsaken Added in Afterbirth / Removed in Repentance Needs to be unlocked
Boss The Frail portrait.png
Boss The Stain portrait.png
Boss Big Horn portrait.png
Boss Rag Mega portrait.png
The Frail Added in Afterbirth / Removed in Repentance Needs to be unlocked The Stain Added in Afterbirth Needs to be unlocked Big Horn Added in Afterbirth † Needs to be unlocked Rag Mega Added in Afterbirth † Needs to be unlocked
Boss Fistula portrait.png
Boss Bumbino portrait.png
Fistula Added in Repentance Bumbino Added in Repentance

Double Trouble[]

Double Trouble Bosses
Boss Dingle portrait.png
Boss The Duke of Flies portrait.png
Boss Gemini portrait.png
Boss Larry Jr. portrait.png
(Double Trouble)
Dingle
(Double Trouble)
The Duke of Flies
(Double Trouble)
Gemini
(Double Trouble)
Larry Jr.
Boss Monstro portrait.png
Boss Pin portrait.png
Boss Polycephalus portrait.png
Boss Rag Man portrait.png
(Double Trouble)
Monstro
(Double Trouble)
Pin
(Double Trouble)
Polycephalus
(Double Trouble)
Rag Man Added in Afterbirth Needs to be unlocked

Unlockable Achievements[]

  • Spelunker Boy
    Spelunker Boy - Beat chapter 2 without taking damage.

Music[]

The music in the caves is titled Sodden Hollow. The word "sodden" in the name is used to describe the damp, wet appearance of the caves.

Binding of Isaac: Rebirth OST


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