Binding of Isaac: Rebirth Wiki
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Added in Afterbirth

The Burning Basement is one of the environments in chapter 1 added in The Binding of Isaac: Afterbirth. The theme of the Burning Basement is fire, and most enemies are replaced with burning versions. There are relatively few flying or shooting enemies; most of the enemies are ground-based and rely on contact damage. Rocks have a chance to be replaced with Fire Places.

The Burning Basement's alternate floors are Basement Basement and Cellar Cellar.

Added in Afterbirth † The Burning Basement is unlocked by defeating Mom's Heart 11 times.

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
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.
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.
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.
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.
Trite
Trite
29.1 Quickly leaps towards Isaac and deals contact damage.
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.
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.
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.
Mulligan
Mulligan
16.0 Walks around the room, avoiding Isaac. Upon death, spawns several flies, which can be Flies, Attack Flies, and/or 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 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 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.
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.
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.
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.
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.
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.
Nerve Ending
Nerve Ending
231.0 Static enemy which acts as a meat shield.
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.
Wall Hugger
Wall Hugger
218.0 Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
Embryo
Embryo
77.0 Aimlessly hops around the room, dealing contact damage.
Brownie Corn
Brownie Corn
217.2 Quickly dashes in random directions, dealing contact damage.
Flaming Gaper
Flaming Gaper
10.2 Walks towards Isaac, dealing contact damage. Usually turns into a Pacer Pacer or Gusher Gusher upon death.
Conjoined Fatty
Conjoined Fatty
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.
Cyclopia
Cyclopia
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.
Dart Fly
Dart Fly
256.0 Flies towards Isaac and attempts to predict his movements. Deals contact damage.
Greed Gaper
Greed Gaper
299.0 Walks towards Isaac, dealing contact damage.
Blue Gaper
Blue Gaper
297.0 Walks towards Isaac, dealing contact damage.
Suction Pitfall
Suction Pitfall
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.
Swarm
Swarm
281.0 Follows Isaac in large, tightly-clustered groups and deals contact damage.
Flaming Fatty
Flaming Fatty
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.
Rag Man's Ragling
Rag Man's Ragling
246.1 Quickly leaps towards Isaac and deals contact damage. Randomly shoots two purple shots that orbit around it.
Roundy
Roundy
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
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.
Crispy
Crispy
Added in Afterbirth †
226.2 Slowly walks towards Isaac, but increases in speed as they take damage. Constantly passively takes damage.
Ministro
Ministro
Added in Afterbirth †
305.0 Hops towards Isaac, occasionally spitting out a cluster of disorganized shots.
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.
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; 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.
Coal Spider
Coal Spider
Added in Repentance
818.2 Quickly crawls around the room. If it sees Isaac, it crawls at him, trying to deal contact damage. Turns into a hot coal upon death that blocks shots and deals contact damage, but can be destroyed.
Grilled Clotty
Grilled Clotty
Added in Repentance
15.3 Quickly and randomly wanders around the room, firing four flame shots in the cardinal directions at a slight angle.
Needle
Needle
Added in Repentance
881.0 Pops out of the ground and lunges towards Isaac, dealing contact damage.
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 The Duke of Flies portrait.png
Boss Larry Jr. portrait.png
Boss The Haunt portrait.png
Boss Monstro portrait.png
The Duke of Flies Larry Jr. The Haunt Removed in Repentance Monstro
Boss The Fallen portrait.png
Boss Famine portrait.png
Boss The Headless Horseman portrait.png
Boss Little Horn portrait.png
The Fallen Devil Room Icon.png Famine Needs to be unlocked The Headless Horseman Needs to be unlocked Little Horn Needs to be unlocked
Boss Rag Man portrait.png
Boss Dingle portrait.png
Boss Gemini portrait.png
Boss Gurglings portrait.png
Rag Man Needs to be unlocked Dingle Added in Repentance Gemini Added in Repentance Gurglings Added in Repentance
Boss Steven portrait.png
Boss Dangle portrait.png
Boss Turdlings portrait.png
Boss Baby Plum portrait.png
Steven Added in Repentance Needs to be unlocked Dangle Added in Repentance Needs to be unlocked Turdlings Added in Repentance Needs to be unlocked Baby Plum Added in Repentance

Unlockable Achievements[]

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

Trivia[]

  • Removed in Repentance Despite being called the Burning Basement, the backdrop of the floor is actually based on The Cellar.

Music[]

The track that plays in the Burning Basement is titled Fundamentum.

Binding of Isaac: Afterbirth OST


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