The Catacombs

The Catacombs is the alternative chapter of The Caves. The Catacombs are unlocked once each boss in The Caves has been defeated.

Monsters

Monsters	Description
Boil	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	Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires Ipecac shots in random directions when fully swollen.
Sack	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	Does not shrink or regenerate. Walks around aimlessly and fires multiple short-ranged blood projectiles in random directions.
Walking Gut	Does not shrink or regenerate. Walks around aimlessly and fires Ipecac shots in random directions.
Walking Sack	Does not shrink or regenerate. Walks around aimlessly and occasionally spawns Spiders.
Bony	Wanders around the room and throws a bone at Isaac when he is in sight.
Buttlicker	Attaches itself to other Buttlickers and erratically moves around the room, similar to Larry Jr..
Chubber	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	Randomly wanders around the room, firing 4 tar shots in the ordinal directions.
I.Blob	Randomly wanders around the room, firing 8 shots in all directions.
Dip	Slowly dashes in random directions, dealing contact damage.
Squirt	Dashes towards the player and deals contact damage. Spawns 2 Dips upon death.
Embryo	Aimlessly hops around the room, dealing contact damage.
Fatty	Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away.
Pale Fatty	Slowly walks towards Isaac. Occasionally farts and shoots blood shots in 6 directions. Can turn into a Blubber upon death.
Half Sack	Wanders around aimlessly and leaves a trail of red creep.
Blubber	Walks around aimlessly and randomly spews blood around itself. Can turn into a Half Sack when killed.
Attack Fly	Red fly that follows Isaac and deals touch damage.
Moter	Follows Isaac, similar to Attack Flies. Splits into 2 Attack Flies upon death.
Pooter	Slow-moving fly that occasionally fires single blood shots at Isaac. Does not deal touch damage.
Red Boom Fly	Flies around the room diagonally, dealing touch damage and exploding into 6 blood shots upon death.
Full Fly	Flies toward Isaac erratically, dealing touch damage. Splits into 6 directional shots upon death.
Sucker	Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Spit	Flies slowly towards Isaac, firing an Ipecac shot towards Isaac upon death.
Gurgle	Walks towards Isaac, firing Ipecac shots at him. Can turn into a Splasher upon death.
Skinny	Slowly walks towards Isaac, leaving short-lasting red creep behind itself.
Globin	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	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	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.
Gurglings	Charges towards Isaac when he lines up with them, leaving a trail of creep and shooting 6 blood shots.
Psychic Horf	Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
Flaming Hopper	Quickly hops around the room, dealing touch damage. Covers a larger distance than the regular Hopper.
Leaper	Hops around the room, dealing touch damage. Occasionally jumps high into the air, dropping down onto Isaac's position while firing 4 blood shots in the cardinal directions.
Host	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 and lower its head again.
Red Host	Stationary enemy that can be damaged even when its head is lowered. Fire 5 spread blood shots when it raises its head.
Mobile Host	Acts like the Host, but follows Isaac and deals contact damage.
Flesh Mobile Host	Acts like the Red Host, but follows Isaac and deals contact damage.
Keeper	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	Moves erratically around the room and charges toward Isaac when in line of sight. Can only be damaged from behind.
Maggot	Aimlessly moves around the room, dealing contact damage.
Charger	Slowly moves around the room, charging at Isaac when he gets in its line of sight.
Spitty	Slowly moves around the room, occasionally firing a single blood shot forwards.
Conjoined Spitty	Slowly moves around the room, occasionally firing blood shots from both ends of its body.
Mask + Heart	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	Slowly floats towards Isaac, firing blood shots when Isaac is in range of them.
Mulliboom	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	Walks around the room, avoiding Isaac while spawning Attack Flies. Spawns a large number of flies upon death, which can be Black Flies, Attack Flies, or Pooters.
One Tooth	Follows Isaac and periodically dashes towards Isaac when it gets close. Deals contact damage.
Pacer	Walks aimlessly around the room.
Splasher	Walks aimlessly around the room, firing Ipecac shots in random directions.
Round Worm	Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.
Nightcrawler	Pops out of the ground in random locations and fires four short-range shots that spiral outwards if Isaac is in sight.
Spider	Erratically moves towards Isaac and deals touch damage.
Big Spider	Erratically moves towards Isaac and deals touch damage. Splits into two Spiders upon death.
Level 2 Spider	Crawls around the room erratically, following Isaac and dealing touch damage. Can jump small distances.
Ticking Spider	Crawls around the room erratically, following Isaac and dealing touch damage. Can jump small distances. Explodes upon death.
Trite	Quickly leaps towards Isaac and deals touch damage.
Ragling	Quickly leaps towards Isaac and deals touch damage. Randomly shoots two purple shots that orbit around it.
Baby Long Legs	Runs away from Isaac and frequently spawns Spiders.
Crazy Long Legs	Chases Isaac, dealing touch damage. Occasionally stops to spit blood shots in 8 directions.
Wall Creep	Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Blind Creep	Randomly crawls along walls and shoots three spread blood shots.
Tumor	Moves around the room diagonally, occasionally firing 6 shots. Fires more often upon getting damaged.
Constant Stone Shooter	Stationary and invulnerable monster that continuously fires shots in a single direction.
Gaping Maw	Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles.

Mini-Bosses
Blastocyst (small) Larry Jr. Teratoma (small and medium)

Bosses

The Catacombs

The Hollow	The Husk	Peep	Polycephalus	Pestilence

Carrion Queen	The Wretched	Gurdy Jr.	Dark One

The Stain	The Frail	The Forsaken

Rag Mega	Big Horn

Double Trouble

(Double Trouble) Dingle	(Double Trouble) The Duke of Flies	(Double Trouble) Gemini	(Double Trouble) Pin

Unlockable Achievements

• 

  Something Cute - Beat Chapter 2 30 times.

• 

  Telekinesis - Beat Chapter 2 without taking damage.

• 

  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 Music