Dross

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(in Repentance and Repentance+)

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

Dross is an alternative floor to DownpourDownpour, differentiating itself from Downpour by having more poop and sewage-themed enemies. Just like in DownpourDownpour, Collectible Knife Piece 1 icon.pngKnife 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 affect 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 flow will hamper your speed if you move against it and speed you up if you move with it.

In addition, Dross floors have the rare chance to spawn Giant Poops, Big Poops that take up 4× 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 Drip.pngDrips 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 Fly.pngAttack 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 non-consecutively. 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 Pooter.pngPooters if they stay around Poop.pngPoop.
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.pngCorny Poop and various monsters. Deals contact damage. Turns into a vulnerable Attack Fly.pngAttack 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 Fly.pngDart 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.pngPacer or a Gusher.pngGusher 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.pngPacer or with a small chance a Gusher.pngGusher 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.pngPacer or Gusher.pngGusher 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 Leech.pngSmall 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 Wormwood (Dross) portrait.png
Boss Lil Blub (Dross) portrait.png
Clog Colostomia Wormwood Lil Blub
Boss Turdlet portrait.png
Turdlet

Knife Piece 1

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

  • A White Fire Place that cannot be extinguished. Touching it separates Isaac's body and soul, converting Isaac into Character The Lost icon.pngThe Lost (with Collectible Holy Mantle icon.pngHoly 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.
    • Be warned that even if it has been unlocked for The Lost, the Holy Mantle will not be active until Isaac leaves the room. Taking damage in the same room after touching the white fireplace will be fatal.
    • When playing as Character The Forgotten icon.pngThe Forgotten, Character The Lost icon.pngThe Lost still fights with the bone club, and turning into Character The Soul (Character) icon.pngThe Soul is still possible.
    • When playing as Character Azazel icon.pngAzazel, Character The Lost icon.pngThe Lost keeps Azazel's mini-Collectible Brimstone icon.pngBrimstone attack.
  • A 1×1 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 Character Tainted Forgotten icon.pngTainted Forgotten (but not non-tainted Character The Soul (Character) icon.pngThe Soul) or Dark Esau-stricken Character Tainted Jacob icon.pngTainted Jacob, the former of which is allowed to retain their [functional] health), after which it leads Isaac to the Mirrored World, where he can find the Collectible Knife Piece 1 icon.pngKnife Piece 1.

  • No items or pickups other than Knife Piece 1 will spawn there via level generation (i.e. be present upon the room being loaded/entered). However, the player can still get rewards for clearing rooms or destroying objects.
    • Beating the boss room will spawn an item from the boss pool.
    • While shops do not usually have items or pickups in them, using or destroying a restock machine will spawn items and pickups from the shop pool to buy.

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 Collectible Knife Piece 2 icon.pngKnife Piece 2 and complete the process, be sure to head to the MinesMines/AshpitAshpit II next.

Trivia

  • Dross may be a reference to the Sewers of Dross from Gish, one of Edmund McMillen's previous games.
  • 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.pngHenry. He will smile at Isaac, then get flushed, instantly getting killed.
  • "Dross", other than a synonym for rubbish and feces, is the residue of smelting of precious metals, frequently mentioned in the Bible as a methaphor for impurity and worthlessness.

Music

  • The music for the Dross is called Night Soil.
    • Night Soil is a historical euphemism for human waste, which used to be collected at night from cesspools and eventually made into a fertilizer.

Gallery