Downpour

Downpour is a new environment added in Antibirth.

Treasure rooms in Downpour always have two items to choose from.

After "A Secret Exit" is unlocked, a locked door to Downpour I or II will appear upon completing The Basement/Cellar I or II, respectively. The locked door requires a single key to enter.

Downpour resembles flooded sewers, with water reflecting the enviroment. Its enemies are water-themed and mainly shoot tears, like Isaac, instead of blood. Under certain circumstances, after killing all enemies in the room, several Gapers emerge from the water to attack Isaac.

Monsters

Monster	Description
Blurb	Walks towards Isaac and fires a chaotic burst of tears if they get close. After firing their tears, they act like regular Gapers and chase Isaac, attempting to deal contact damage.
Prey	Runs away from Isaac and periodically spawns Small Leeches. Spawns more Small Leeches upon death.
Sub Horf	Rotates and fires tears upon taking damage.
Bubbles	Slowly walks towards Isaac, occasionally firing a tear at Isaac when damaged. Upon death, bursts into a fountain of tears.
Tidal Gaper	Pops out of the water and chases Isaac. Has a chance to spawn with a Small Leech attached, which will detach when the Gaper is killed.
Small Leech	Swims towards Isaac, and can travel across gaps.
Strider	Swims towards Isaac in small bursts, and can travel across gaps.
Wraith	Chases Isaac. Invisible; detectable only by its reflection and the ripples in the water, and the occasional lightning that makes them briefly visible.
Willo	Orbits Isaac, periodically firing orange shots inwards.
Mullighoul	Runs away from Isaac, occasionally spawning a Willo. Spawns a Willo upon death.
Polty	Appears out of a random bucket, then picks up and throws obstacles at Isaac. If the room has no usable obstacles, it will leave the room. If there are any Tinted Rocks in the room, it will wait until they are the last remaining obstacle, then attempt to flee with one of them.

Bosses

		File:The Rainmaker.png
Wormwood	Beelzeblub	The Rainmaker

Knife Piece

Downpour II contains Knife Piece 1, one of three pieces necessary to enter the Corpse.

Somewhere on the floor, there will be a seemingly empty dead end room with a minimap icon that indicates the room has a chest. Bombing the center of the room will open a hidden stone chest containing Knife Piece 1.