Binding of Isaac: Rebirth Wiki
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The Cellar is one of the environments in Chapter 1. It is unlocked after defeating each boss in the Basement Basement, including defeating the smallest twin first in Gemini's fight. It is not necessary to defeat Steven to unlock the Cellar. The theme of the Cellar is spiders and poop.

The Cellar's alternate floors are the Basement Basement and the Added in Afterbirth Burning Basement Burning Basement.

After Added in RepentanceA Secret Exit A Secret Exit is unlocked, a locked door similar to the one leading to a Treasure Room will appear in this floor's Boss Room upon defeating the boss leading to Downpour Downpour / Dross Dross. Like a Treasure Room, this door requires a key to be unlocked. Unlike Angel Rooms and Devil Rooms, this door never disappears.

Monsters[]

Entity ID Description
Sack
Sack
30.2 Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Occasionally spawns Spider Spiders when fully swollen.
Walking Sack
Walking Sack
88.2 Does not shrink or regenerate. Walks around aimlessly and occasionally spawns Spider Spiders.
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.
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 Pooter Pooters if they stay around Poop 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 Fly 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.
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.
Level 2 Fly
Level 2 Fly
214.0 Flies toward Isaac erratically, dealing contact damage.
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 Ipecac shot towards Isaac upon death.
Gaper
Gaper
10.1 Walks towards Isaac, dealing contact damage. Usually turns into a Pacer Pacer or a Gusher Gusher upon death.
Frowning Gaper
Frowning Gaper
10.0 Walks towards Isaac, dealing contact damage. They start out with their eyes closed, but when they gain line of sight with Isaac, their eyes open and they permanently move faster. Usually turns into a Pacer Pacer or a Gusher Gusher upon death
Skinny
Skinny
226.0 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself.
Horf
Horf
12.0 Stationary enemy that fires a medium-ranged blood shot at Isaac when he gets in range of them.
Psychic Horf
Psychic Horf
248.0 Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
Mulligan
Mulligan
16.0 Walks around the room, avoiding Isaac. Upon death, spawns several flies, which can be Fly Flies, Attack Fly Attack Flies, and/or Pooter Pooters. Can self-detonate and launch four projectiles in the cardinal directions while still releasing flies.
Mulligoon
Mulligoon
16.1 Walks around the room, avoiding Isaac. Upon death, spawns a Troll Bomb Troll Bomb and fires four shots in the ordinal directions. Can self-detonate, spawn a Troll bomb, and launch eight projectiles in all directions.
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 Fly Attack Flies if he gets close. Spawns a large number of flies on death, which can be Fly Flies, Attack Fly Attack Flies, and/or Pooter Pooters.
Nest
Nest
205.0 Wanders around the room, avoiding Isaac and spawning Spider Spiders if he gets close. Spawns a Big Spider Big Spider or Trite Trite upon death.
Pacer
Pacer
11.1 Walks aimlessly around the room.
Gusher
Gusher
11.0 Walks aimlessly around the room, occasionally firing a short-ranged blood shot.
Hopper
Hopper
29.0 Slowly hops around the room, doing contact damage. Can turn into a Error: The given entity ("Flaming Hopper") does not exist. by jumping into Fire Place Fire Places or other fires.
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.
Blind Creep
Blind Creep
242.0 Randomly crawls along walls and shoots three spread blood shots.
Wall Creep
Wall Creep
240.0 Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Wall Hugger
Wall Hugger
218.0 Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
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.
Flaming Fatty
Flaming Fatty
Added in Afterbirth
208.2 Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away Added in Repentance and spawns a damaging flame. Has a chance to leave behind a damaging flame upon death.
Brownie Corn
Brownie Corn
Added in Afterbirth
217.2 Quickly dashes in random directions, dealing contact damage.
Dart Fly
Dart Fly
Added in Afterbirth
256.0 Flies towards Isaac and attempts to predict his movements. Deals contact damage.
Swarm
Swarm
Added in Afterbirth
281.0 Follows Isaac in large, tightly-clustered groups and deals contact damage.
Cyclopia
Cyclopia
Added in Afterbirth
284.0 Walks towards Isaac, dealing contact damage and leaving behind a short-lasting trail of damaging Red Creep. Occasionally shoots a blood shot towards Isaac.
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.
Black Globin's Head
Black Globin's Head
Added in Afterbirth
279.0 Slides towards Isaac, leaving a trail of damaging Red Creep.
Black Globin's Body
Black Globin's Body
Added in Afterbirth
280.0 Walks aimlessly around the room, occasionally spawning spiders.
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.
Mega Clotty
Mega Clotty
Added in Afterbirth
282.0 Slowly moves around the room, occasionally hopping and either firing 6 blood shots in all directions, leaving a puddle of Red Creep, or spawning a Clotty Clotty or a collapsed Globin Globin. Splits into two Clotty Clotties upon death.
Suction Pitfall
Suction Pitfall
Added in Afterbirth
291.1 Invulnerable and stationary enemy which sucks Isaac towards itself. Isaac falls into it when walked over, taking damage and popping back out after a short delay.
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.
Portal
Portal
Added in Afterbirth † / Removed in Repentance
306.0 Spawns various enemies from the current floor until it either vanishes or is killed.
Bulb
Bulb
Added 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
Added in Repentance
869.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances. Releases multiple Troll Bomb Troll Bombs upon death.
Swarm Spider
Swarm Spider
Added 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

Bosses[]

Boss Blighted Ovum portrait.png
Boss The Duke of Flies portrait.png
Boss The Haunt portrait.png
Boss Pin portrait.png
Blighted Ovum The Duke of Flies The Haunt Pin
Boss Widow portrait.png
Boss Fistula portrait.png
Boss Famine portrait.png
Boss The Fallen portrait.png
Widow Fistula Removed in Repentance Famine Needs to be unlocked The Fallen Devil Room Icon.png
Boss The Headless Horseman portrait.png
Boss Little Horn portrait.png
Boss Rag Man portrait.png
The Headless Horseman Needs to be unlocked Little Horn Added in Afterbirth Needs to be unlocked Rag Man Added in Afterbirth Needs to be unlocked Baby Plum Added in Repentance

Notes[]

  • Unlocking the Cellar requires defeating every boss in the Basement. However, this does not require fighting them in the Basement. It is possible, for instance, to have defeated every single boss except for the Gurglings, encounter them in the Womb, clear the room in which they are encountered, and successfully unlock the Cellar.

Trivia[]

In the original Binding of Isaac, Gurdy Jr. Gurdy Jr. could appear as a boss.

Unlockable Achievements[]

  • Basement Boy
    Basement Boy - Beat Chapter 1 without taking damage.

Music[]

The music for the cellar is titled Periculum. Periculum is Latin for "danger" or "risk", signifying how the Cellar is a step-up from the Basement.

Binding of Isaac: Rebirth OST


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