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The Catacombs is one of the environments of Chapter 2.

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

(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 RoomBoss Room upon defeating the boss, leading to the MinesMines / AshpitAshpit. This door, like a Bedroom, requires two bombs to be opened. Unlike Angel RoomAngel Rooms and Devil RoomDevil 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 Collectible Ipecac iconIpecac 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 SpiderSpiders 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 Collectible Ipecac iconIpecac shots in random directions.
Walking Sack
Walking Sack
88.2 Does not shrink or regenerate. Walks around aimlessly and occasionally spawns SpiderSpiders.
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 Boss Larry Jr. ingameLarry 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.
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
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.
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.
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 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 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.
Fly
Fly
13.0 Hovers in place. Does not deal contact damage and is harmless, but can turn into PooterPooters if they stay around PoopPoop.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Moter
Moter
80.0 Follows Isaac, similar to Attack FlyAttack Flies. Deals contact damage. Splits into 2 Attack Flies upon death.
Level 2 Fly
Level 2 Fly
214.0 Flies toward Isaac erratically, dealing contact damage.
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.
Boom Fly
Boom Fly
25.0 Flies across the room in straight diagonal lines, dealing contact damage. Explodes upon death.
Red Boom Fly
Red Boom Fly
25.1 Flies across the room in straight diagonal lines, 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 Collectible Ipecac iconIpecac shot towards Isaac upon death.
Gurgle
Gurgle
87.0 Walks towards Isaac, dealing contact damage and periodically firing Collectible Ipecac iconIpecac shots at him; they are immune to this explosion, but other enemies are not. Can turn into a SplasherSplasher 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 BonyBony or two Attack FlyAttack 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 Boss Larry Jr. ingameLarry Jr. and charges at Isaac when he gets within its line of sight. Spawns MaggotMaggots, ChargerChargers, or SpittySpitties 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.
Hopper
Hopper
29.0 Slowly hops around the room, doing contact damage. Can turn into a Flaming Hopper by jumping into Fire PlaceFire Places or other fires.
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.
Hanger
Hanger
90.0 Floats around the room, firing 3 spread blood shots at Isaac. Upon damaging Isaac, Isaac drops 2 coins on the ground but loses 3. Spawns with an Eternal FlyEternal Fly circling around it.
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
93.0 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 a blood shot at him when he is in their range.
Red Maw
Red Maw
26.1 Floats quickly towards Isaac and releases 4 blood shots in the cardinal directions 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.
Hive
Hive
22.0 Wanders around the room, avoiding Isaac and spawning Attack FlyAttack Flies if he gets close. Spawns a large number of flies on death, which can be FlyFlies, Attack FlyAttack Flies, and/or PooterPooters.
Nest
Nest
205.0 Wanders around the room, avoiding Isaac and spawning SpiderSpiders if he gets close. Spawns a Big SpiderBig Spider or TriteTrite upon death.
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.
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.
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.
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.
Vomit Grimace
Vomit Grimace
42.1 Stationary and invulnerable monster that occasionally fires an Ipecac 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.
Wall Hugger
Wall Hugger
218.0 Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
Corn
Corn
(except in Rebirth)
217.1 Quickly dashes in random directions, dealing contact damage.
Dank Squirt
Dank Squirt
(except in Rebirth)
220.1 Dashes towards Isaac and deals contact damage, creating slowing black creep. Spawns 2 Clots upon death.
Dart Fly
Dart Fly
(except in Rebirth)
256.0 Flies towards Isaac and attempts to predict his movements. Deals contact damage.
Conjoined Fatty
Conjoined Fatty
(except in Rebirth)
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.
Fat Bat
Fat Bat
(except in Rebirth)
258.0 Slowly flies towards Isaac. Tries to align itself diagonally to Isaac and shoots at him when in that alignment.
Roundy
Roundy
(except in Rebirth)
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.
Swarm
Swarm
(except in Rebirth)
281.0 Follows Isaac in large, tightly-clustered groups and deals contact damage.
Dukie
Dukie
(except in Rebirth)
288.0 Flies around the room diagonally, occasionally spitting out 1-2 Dart FlyDart Flies.
Ulcer
Ulcer
(except in Rebirth)
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.
Corn Mine
Corn Mine
(except in Rebirth)
295.0 Goes off when destroyed or after some time, then releases a cloud of poisonous gas and fires corny shots in eight directions.
Blue Gaper
Blue Gaper
(except in Rebirth)
297.0 Walks towards Isaac, dealing contact damage.
Blue Boil
Blue Boil
(except in Rebirth)
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.
Greed Gaper
Greed Gaper
(except in Rebirth)
299.0 Walks towards Isaac, dealing contact damage.
Mushroom
Mushroom
(in Afterbirth † and Repentance)
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.
Stoney
Stoney
(in Afterbirth † and Repentance)
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.
Blister
Blister
(in Afterbirth † and Repentance)
303.0 Slowly hops towards Isaac, occasionally spawning a Dark Ball. Spawns a SackSack upon death.
The Thing
The Thing
(in Afterbirth † and Repentance)
304.0 Crawls along a wall and attempts to line up with Isaac, then spits a line of damaging Red Creep.
Ministro
Ministro
(in Afterbirth † and Repentance)
305.0 Hops around randomly and hop towards Isaac when he gets close, occasionally spitting out a cluster of disorganized shots.
Portal
Portal
(in Afterbirth †)
306.0 Spawns various enemies from the current floor until it either vanishes or is killed.
Eggy
Eggy
(in Repentance)
29.2 Hops aimlessly around the room, spawning slowing white creep wherever it hops. Spawns a group of Swarm SpiderSwarm Spiders upon death.
Bulb
Bulb
(in Repentance)
61.5 Flies in erratic, angled movements toward Isaac if his active item has charges; on contact, they drain up to 2 charges, but never deal contact damage. If he has no active item, or no charges, they wander around the room aimlessly.
Migraine
Migraine
(in Repentance)
869.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances. Releases multiple Troll BombTroll Bombs upon death.
Swarm Spider
Swarm Spider
(in Repentance)
884.0 Very erratically hops toward Isaac in large groups, dealing contact damage.

Degraded Bosses:

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

Bosses[ | ]

Boss Carrion Queen
Boss Dark One
Boss Gurdy Jr.
Boss The Hollow
Carrion Queen Dark One Gurdy Jr. The Hollow
Boss The Husk
Boss Peep
Boss Polycephalus
Boss The Wretched
The Husk Peep Polycephalus The Wretched
Boss Pestilence
Boss The Fallen
Boss The Headless Horseman
Boss The Forsaken
Pestilence Needs to be unlocked The Fallen Devil Room Icon The Headless Horseman Needs to be unlocked The Forsaken (except in Rebirth) Needs to be unlocked
Boss The Frail
Boss The Stain
Boss Big Horn
Boss Rag Mega
The Frail (except in Rebirth) Needs to be unlocked The Stain (in Afterbirth and Afterbirth †) Needs to be unlocked Big Horn (in Afterbirth † and Repentance) Needs to be unlocked Rag Mega (in Afterbirth † and Repentance) Needs to be unlocked
Boss Bumbino
Bumbino (in Repentance)

Double Trouble[ | ]

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

Gurglings (in Repentance)

Trivia[ | ]

In the original Binding of Isaac, Boss Blighted Ovum ingameBlighted 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.[1]
    • 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".

References[ | ]


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