Binding of Isaac: Rebirth Wiki
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Added in Repentance

Dross is one of the environments of chapter 1.5, added in The Binding of Isaac: Repentance.

Dross is an alternative floor to Downpour Downpour, differentiating itself from Downpour by having more poop and sewage-themed enemies. Just like in Downpour Downpour, Knife Piece 1 Knife Piece 1 can be found on Dross II. Some rooms in this green brick sewage recess have a thin layer of dirtied reflective water on the ground.

Along with the watery floor, many visual effects are employed on this floor, such as:

  • Random walls might have animated pipes pumping brown sewage onto the floor.
  • Wet rooms have water distorted light reflections on the walls.
  • Random water shower points consistently dropping water on the floor in small areas.
  • Small water droplets randomly fall from the sky, leaving small wet marks that dry over in dry rooms, and don't really visually effect the floor of wet rooms.
  • The floor underneath the water can be tiled, solid concrete, or grated.
  • Overhead, light is blocked in 3-4 bar grate, multi-pipe, and diagonal pipe patterns, the remain light hitting the floor and coloring it a little more yellow.
  • Downpour Buckets also show up here as well, with the full variant of the bucket being full of poop, instead of full of water.

In Dross, some Rooms may have grates on the walls, expelling a strong water flow. The water flow pushes Isaac and everything else in the Room in one specific direction, usually towards the wall opposing the grates. The river will hamper your movement if you try to push against the current, and speed you up if you go with the flow.

In addition, Dross floors have the rare chance to spawn Giant Poops, Big Poops that take up 4x the space as regular Poops.

Monsters[]

Entity ID Description
Drip
Drip
870.0 Quickly rolls around in diagonal directions, dealing contact damage.
Big Corn
Big Corn
217.3 Quickly dashes in random directions, dealing contact damage. Shoots one piece of corn upon death.
Splurt
Splurt
871.0 Dashes towards Isaac twice and deals contact damage. Spawns 2 Drips upon death.
Cloggy
Cloggy
872.0 Randomly wanders around the room, firing four curved brown shots in the cardinal directions. These shots alternate between rotating clockwise and counterclockwise with each shot.
Fly Trap
Fly Trap
873.0 Floats towards Isaac, with 3 Attack Flies circling around it. Coughs up additional Attack Flies and releases gas to launch the Attack Flies outwards.
Gas Dwarf
Gas Dwarf
874.0 Chases Isaac, periodically coughing up gas clouds. On death, fires an explosive shot that can detonate gas clouds it hits.
Poot Mine
Poot Mine
875.0 Creates a gas cloud and propels itself away from Isaac when it gets hit. Explodes on death, detonating all the gas clouds it created.
Dump
Dump
876.0 Slides toward Isaac, leaving a trail of slippery brown creep. After taking enough damage, its head slides off and quickly bounces around the room and its body spews out brown shots until it empties.
Dump Head
Dump Head
876.1 Quickly slides toward Isaac, leaving a trail of slippery brown creep. Can spawn on its own or be created by a Dump after it takes enough damage.
Small Leech
Small Leech
810.0 Chases Isaac continuously, not stopping at walls. Able to swim over gaps.
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.
Eternal Fly
Eternal Fly
96.0 Invulnerable fly that circles Corny Poop and various monsters. Deals contact damage. Turns into a vulnerable Attack Fly after the object or monster it circles is destroyed.
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.
Dart Fly
Dart Fly
256.0 Flies towards Isaac and attempts to predict his movements. Deals contact damage.
Swarm
Swarm
281.0 Follows Isaac in large, tightly-clustered groups and deals contact damage.
Army Fly
Army Fly
868.0 Chases Isaac, moving along the cardinal directions. Forms a line with other Army Flies in the room. Deals contact damage.
Boom Fly
Boom Fly
25.0 Flies across the room in straight diagonal lines, dealing contact damage. Explodes upon death.
Dukie
Dukie
288.0 Flies around the room diagonally, occasionally spitting out 1-2 Dart Flies.
Tube Worm
Tube Worm
244.1 Pops out of the ground in random locations and fires a long-range spray of arcing shots where Isaac will be.
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
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.
Bulb
Bulb
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.
Wraith
Wraith
807.0 Walks toward Isaac, dealing contact damage. They are invisible and can only be seen through the reflection they cast in the water, or the ripples they make as they walk.
Blurb
Blurb
813.0 Walks slowly towards Isaac, dealing contact damage. After taking some damage or getting close to Isaac, it fires a chaotic burst of tears at him and chases him more quickly. Can turn into a Pacer Pacer or Gusher Gusher upon death.
Bubbles
Bubbles
806.0 Slowly walks towards Isaac, firing back shots upon taking damage. Occasionally farts, which pushes Isaac and adjacent enemies away and creates a chaotic burst of shots. Creates a geyser of water shots upon death.
Sub Horf
Sub Horf
812.0 Stationary enemy that spins and fires shots while being moved around or knocked back.
Deep Gaper
Deep Gaper
811.0 Emerges from the floor once all previous enemies have been killed, then proceeds to chase Isaac. Deals contact damage.
Prey
Prey
817.0 Wanders around the room, avoiding Isaac and spawning Small Leeches if he gets close. Spawns 3 Small Leeches upon death.
Henry
Henry
837.0 Flushes itself away shortly after Isaac enters the room.

Bosses[]

Boss Clog portrait.png
Boss Colostomia portrait.png
Boss Turdlet portrait.png
Clog Needs to be unlocked Colostomia Needs to be unlocked Wormwood Needs to be unlocked Lil Blub Needs to be unlocked Turdlet Needs to be unlocked

Knife Piece 1[]

Downpour II (or Dross II) contains a special area in which Isaac can acquire the Knife Piece 1 Knife Piece 1, one of the key items for accessing Corpse Corpse. Two unique features can be found here:

  • A White Fire Place that cannot be extinguished, touching which separates Isaac's body and soul, converting Isaac into The Lost The Lost (with Holy Mantle Holy Mantle if you have unlocked it as a starting item, as well as your current items) for a brief time. After a room is cleared, the player returns to normal.
  • A 1x1 room with a mirror on the icon. There is always a mirror that can't be accessed normally.

The mirror can only be entered as the Lost (or Tainted Forgotten Tainted Forgotten), after which it leads Isaac to the Mirrored world, where he can find the Knife Piece 1 Knife Piece 1.

  • No items or pickups will spawn there. However, the player can still get rewards for clearing rooms or destroying objects.

Once Isaac has the Knife Piece and returns through the mirror back to the real world, he will be converted back to the original character. To acquire Knife Piece 2 Knife Piece 2 and complete the process, be sure to head to Mines Mines/Ashpit Ashpit II next.

Trivia[]

  • The Dross may be a reference to the Sewers of Dross from Gish, one of Edmund McMillen's previous games.
  • The Dross may also be a reference to the Sewers of Dross from The Legend of Bum-bo.
  • Like the Downpour, the Dross has unique recolors of certain enemies. Tube Worms, Blurbs, Sub Horfs, Gapers, Frowning Gapers, Pacers, Gushers, and Small Leeches are recolored to fit the floor, Preys and Bubbles are altered to focus on poop, and Deep Gapers and Wraiths get a different texture entirely.
  • Ocasionally, player can find a rare room that only contains Henry. He will smile at Isaac, then get flushed, instantly getting killed.


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