Downpour is a new environment added in Antibirth.
Treasure rooms in Downpour always have two items to choose from.
Downpour resembles flooded sewers, with water reflecting the environment. 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 will emerge from the water to attack Isaac.
Downpour is the only one of the four new added chapters in Antibirth that can contain a Rebirth boss that isn't the Fallen (the Haunt).
Flooding & Storm
The Downpour features a heavy emphasis on water and flooding. The entire floor is submerged in a pool of waist-deep water, that some enemies such as Small Leeches and Striders are capable of using to swim over pits. Numerous Deep Gapers also hide beneath the water and emerged when all enemies in the room have been killed. The reflection visible in the water is also utilized by Wraiths, which they are always visible in even though they are invisible otherwise. There is also a storm playing out in the background, which when lightning strikes, brightens up the room and reveals any Wraiths in the room.
The Downpour is also home to many incorporeal elements as well. Appearing in this level are Polties and Mullighouls, along with the invisible, ghostlike Wraiths, in addition to the returning Rebirth boss The Haunt, which coupled with the darkened environment gives the level a rather supernatural feel.
||Flies around and farts if Isaac is close, if it is damaged, and when it dies. Farts knock Isaac back and propel it forwards.|
||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.|
||Runs away from Isaac and periodically spawns Small Leeches. Spawns more Small Leeches upon death.|
||Rotates and fires tears upon taking damage.|
||Slowly walks towards Isaac, occasionally firing a tear at Isaac when damaged. Upon death, bursts into a fountain of tears.|
||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.|
||Swims towards Isaac, and can travel across gaps.|
||Swims towards Isaac in small bursts, and can travel across gaps.|
||Chases Isaac. Invisible; detectable only by its reflection and the ripples in the water, and the occasional lightning that makes them briefly visible.|
||Orbits Isaac, periodically firing orange shots inwards.|
||Runs away from Isaac, occasionally spawning a Willo. Spawns a Willo upon death.|
||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.|
|Wormwood||Beelzeblub||The Rainmaker||The Haunt|
- 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.
- The track that plays in Downpour is titled Hallowed Ground.
- Downpour is referred to on Isaac's Last Will as "Some Sewer".
|Chapter 1||Chapter 2||Chapter 3||Chapter 4|