Colostomia

Colostomia is a boss introduced in The Binding of Isaac: Repentance and can appear in Dross.

Behavior[]

Colostomia alternates between the following attacks:

Hops in place and then slides toward Isaac in the closest cardinal direction, firing projectiles in both perpendicular directions as she moves and leaving trails of explosive gas.
- The slide can be at a slight angle if Isaac isn't perfectly aligned with it.
- Colostomia continuously performs this attack until ~40% of the room is covered in explosive gas.
Launches a Butt Bombs Bomb towards Isaac that ignites any gas clouds its explosion hits, causing a chain of explosions.
- This is always her first attack upon spawning.
- Unlike Isaac's Butt Bombs, these do not fog the room.

After dropping to half health, the bag containing Colostomia explodes, creating explosive clouds and leaving her adhering to the floor.

Jumps to another nearby location, firing 8 projectiles in a radial burst and creating a puddle of harmful Brown Creep where she lands.
- Only 2 puddles of Brown Creep can persist at once.
Spits two Butt Bombs Bombs at Isaac. The range of these bombs is dependent on how close Isaac is to her.
Farts, creating a ring of explosive gas around her location.

Colostomia is based on a Colostomy bag, a removable, disposable bag that attaches to the exterior opening of a colostomy to permit sanitary collection and disposal of bodily wastes.
Colostomia's 1st phase charge attack is similar to an attack from The Witness in Antibirth.
Colostomia is confirmed female according to messages from Not Your Sagittarius in the official Binding of Isaac Discord.^[1]
Upon death, Colostomia diffuses into the water of the arena, turning it from green to a murky brown.