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

The Catacombs is one of the environments of Chapter 2.

The Catacombs are unlocked once each boss in Caves Caves has been defeated. It generally posseses more spiders and decayed enemies/bosses than caves, like gurgles or guts.

After Added in RepentanceA 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 upon defeating the boss, leading to the Mines Mines / Ashpit Ashpit. This door, like a Bedroom, requires two bombs to be opened. Unlike Angel Rooms and 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 Boil
Walking Boil
88.0 Does not shrink or regenerate. Walks around aimlessly and fires multiple short-ranged blood projectiles in random directions.
Walking Gut
Walking Gut
88.1 Does not shrink or regenerate. Walks around aimlessly and fires 15►Ipecac Ipecac shots in random directions.
Walking Sack
Walking Sack
88.2 Does not shrink or regenerate. Walks around aimlessly and occasionally spawns Spiders.
Bony
Bony
227.0 Wanders around the room and throws a bone at Isaac when he is in sight.
Buttlicker
Buttlicker
89.0 Can start Attached to other Buttlickers and erratically moves around the room, similar to Larry Jr..
Chubber
Chubber
39.2 Randomly wanders around the room. Pauses to fire a Charger that deals one heart of damage when Isaac gets in its line of sight. The Charger is invulnerable, blocks Isaac's tears, has limited range, and flies back to the Chubber.
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
208.2 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.
Half Sack
Half Sack
211.0 Wanders around aimlessly and leaves a trail of Red Creep.
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.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Moter
Moter
80.0 Follows Isaac, similar to Attack Flies. Deals contact damage. Splits into 2 Attack Flies upon death.
Pooter
Pooter
14.0 Slowly drifts toward Isaac, occasionally firing a single blood shot at him. Does not deal contact damage.
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.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Spit
Spit
61.1 Flies slowly towards Isaac, firing an Ipecac shot towards Isaac 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.
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.
Psychic Horf
Psychic Horf
248.0 Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
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.
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.
Keeper
Keeper
86.0 Hops around the room, firing 2 blood shots in a V formation at Isaac. Upon damaging Isaac, Isaac drops 2 coins on the ground but loses 3.
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.
Mask + Heart
Mask + Heart
92.0 The Mask is invulnerable and moves around erratically, charging at Isaac when he lines up with it. The Heart avoids Isaac and fires 4 blood shots in the cardinal directions when Isaac gets near. Killing the Heart will automatically kill the Mask.
Maw
Maw
26.0 Slowly floats towards Isaac, firing blood shots at him when he is in their range.
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.
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 Black Flies, Attack Flies, and/or Pooters.
One Tooth
One Tooth
234.0 Follows Isaac and periodically dashes towards him when it gets close. Deals contact damage.
Pacer
Pacer
11.1 Walks aimlessly around the room.
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.
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.
Level 2 Spider
Level 2 Spider
215.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances.
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.
Baby Long Legs
Baby Long Legs
206.0 Runs away from Isaac and frequently spawns Spiders.
Crazy Long Legs
Crazy Long Legs
207.0 Chases Isaac, dealing touch damage. Occasionally stops to spit 8 blood shots in all 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.
Tumor
Tumor
229.0 Moves around the room diagonally, occasionally firing 6 blood shots in all directions. Fires more often upon getting damaged.
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.
Degraded Bosses

Bosses[]

Boss Carrion Queen.png
Boss Dark One.png
Boss Gurdy Jr..png
Boss The Hollow.png
Carrion Queen Dark One Gurdy Jr. The Hollow
Boss The Husk.png
Boss Peep.png
Boss Polycephalus.png
Boss The Wretched.png
The Husk Peep Polycephalus The Wretched
Boss The Fallen.png
Boss The Headless Horseman.png
Boss Pestilence.png
Boss The Forsaken.png
The Fallen Requires previous entry into a devil room The Headless Horseman Needs to be unlocked Pestilence Needs to be unlocked The Forsaken Added in Afterbirth Needs to be unlocked
Boss The Frail.png
Boss The Stain.png
Boss Big Horn.png
Boss Rag Mega.png
The Frail Added in Afterbirth Needs to be unlocked The Stain Added in Afterbirth / Removed in Repentance Needs to be unlocked Big Horn Added in Afterbirth † Needs to be unlocked Rag Mega Added in Afterbirth † Needs to be unlocked
Boss Bumbino.png
Bumbino Added in Repentance

Double Trouble[]

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

Trivia[]

In the original Binding of Isaac, Blighted Ovum could appear as a boss.

Unlockable Achievements[]

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

Music[]

The music for the Catacombs is titled Capiticus Calvaria. Calvaria is Latin for "Skull", and while Capiticus does not have a true definition, it most likely comes from the word Caput, meaning "Head", or Capitulum, meaning "Chapter".

Binding of Isaac: Rebirth OST


SmallIsaac.pngChaptersSmallIsaac.png
Chapter 1 Chapter 2 Chapter 3 Chapter 4 Optional Chapter 5 Chapter 6 Endgame
Normal and hard modes only Stage Basement icon.png Stage Caves icon.png Stage Depths icon.png Stage Womb icon.png Stage Sheol icon.png
Sheol


Stage Cathedral icon.png
Cathedral
Stage Dark Room icon.png
Dark Room


Stage Chest icon.png
The Chest
The Basement The Caves The Depths The Womb
Added in Afterbirth Added in Afterbirth †
Stage Cellar icon.png Stage Catacombs icon.png Stage Necropolis icon.png Stage Utero icon.png ??? Stage The Void icon.png
The Cellar The Catacombs Necropolis Utero ??? The Void
Added in Afterbirth Added in Afterbirth Added in Afterbirth Added in Afterbirth
Stage Burning Basement icon.png Stage Flooded Caves icon.png Stage Dank Depths icon.png Stage Scarred Womb icon.png
Burning Basement Flooded Caves Dank Depths Scarred Womb
Added in Repentance Added in Repentance Added in Repentance Added in Repentance Added in Repentance
Stage Downpour.png Stage Mines icon.png Stage Mausoleum icon.png Stage Corpse icon.png Stage Home icon.png
Downpour Mines Mausoleum Corpse Home
Added in Repentance Added in Repentance Added in Repentance
Stage Dross icon.png Stage Ashpit icon.png Stage Gehenna icon.png
Dross Ashpit Gehenna
Added in Afterbirth
Greed and greedier modes only
Added in Afterbirth Added in Afterbirth
Stage Basement icon.png Stage Caves icon.png Stage Depths icon.png Stage Womb icon.png Stage Sheol icon.png The Shop Ultra Greed
The Basement The Caves The Depths The Womb Sheol The Shop Ultra Greed
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets