Toxic Sewers

"Many believed the sewers were a path to freedom. No one ever made it out the other side."

The Toxic Sewers are a second level biome.

The waters of these formerly somewhat clean sewers have been contaminated by a poisonous greenish substance, which had oozed its way into some of the pipes. The pipes here have faced quite a number of decay, rusting and cracking in some areas. Boxes of unknown origin adorn this filthy series of pipes and tunnels, laying abandoned and to rot. In addition, bars keep some of the area cut off from the rest, with the occasional... Occupant. This place is of quite a danger, as no prisoner seeking freedom has ever stepped out the other side in their original state. Both the toxic atmosphere and the revenants have made sure of that.

Access and exit
The Vine rune is required to access this Biome through Prisoners' Quarters. Two exits lead out of the Toxic Sewers: one takes the Beheaded back to the surface, atop the Ramparts, and the other leads further underground in the Ancient Sewers. To access the Ancient Sewers, the player must possess the Ram rune.

Teleportation rune
An Elite Slasher can be found here which drops the Teleportation rune. It disappears after being defeated once.

Scrolls
The Toxic Sewers contains 3 scrolls, including 1 Power Scroll and 2 Dual-stat scrolls, which cannot spawn in areas requiring the Teleport, Ram or Spider runes.

Enemy tier and gear level scaling
In the table below, you will find the gear level and enemy tier of the Toxic Sewers based on difficulty.

Boss Stem Cells rewards

 * 1 BSC: Treasure Chest
 * 2 BSC: Cursed Chest
 * 3 BSC: ?
 * 4 BSC: Cursed Chest

Chests and loot

 * There is a 10% chance of finding a Cursed Chest in the level
 * A guaranteed cursed chest is found behind a 2 BSC door

Shops
[needs confirmed data]

Secret areas
Two blueprints in total are hidden. The first is for the mutation Spite, which adds damage to shield parries, can be found in the Collector transition area between the Prisoners' Quarters and the Toxic Sewers, and second is for the mutation Frenzy, which is behind 2 minute timed door found in the same transition area.

Enemies
In the Toxic Sewers, you will find plenty of Kamikazes, Disgusting Worms and Scorpions, which are the iconic enemies of this level. In addition, Zombies, Undead Archers and Grenadiers dwell in this biome. On higher difficulties, Purulent Zombies, Knife Throwers and Rampagers make this stage even harder. The Sewers do not have any unique enemies.

In the table below, you will find which enemies are present in the Toxic Sewers depending on difficulty level. For each enemy, any common, uncommon, rare or legendary blueprints they carry are indicated. When applicable, the minimum difficulty level for blueprint acquisition is specified in brackets.

Conjunctivius lore
Main Article: Conjunctivius

A series of lore rooms scattered around the Toxic Sewers and Ancient Sewers explain how Conjunctivius came to be.

It begins with a nameless, faceless corpse in the Sewers, likely infected by the Malaise. The body is bloated and one of its arms has mutated into a tentacle. Green goo trails from the body towards a small hole in the wall. After this encounter, the Beheaded finds that same trail of green goo and an empty cocoon next to a bigger hole in the wall, which was made by an adolescent Conjunctivius. Later, the player stumbles upon the trail of green goo close to a corpse. The trail leads to the remains of a huge cocoon and a gigantic hole, which was carved by the adult Conjunctivius as she escaped. Finally, a message left by soldiers tells how difficult it was to chain Conjunctivius, likely an order of the King. This explains why Conjunctivius is imprisoned in the Insufferable Crypt when the Beheaded arrives.

Malaise lore
Main article: Malaise The Sewers seem to have been central to the spread of the malaise, through the water supply system. For example, piles of contaminated bodies are found rotting in the sewer water. Upon finding them, the Beheaded wonders if those bodies are responsible for the initial infection of the citizens, or if those bodies only helped spread the Malaise by contaminating the whole water network. In a Grimoire found in the Sanctuary, the Alchemist writes that people believe the sap flowing through the walls of the Sanctuary is responsible for the Malaise, by contaminating the sewer network. He also suggests that this same substance could be the solution to the epidemic. it is unclear if the substance is in fact the source of the Malaise or if it's only a rumor. What is sure is that the Alchemist harvested and used this substance as part of a treatment for the infection, as indicated by the Grimoires of the Ossuary and the Clock Tower.

A giant broken door is found next to a soldier message warning not to open this door, lest the rats would get out and spread the Malaise. The Beheaded remarks that it is unlikely rats made such a big hole, which implies something else was kept behind the door. It is unclear who or what was behind the giant door. The lack of green goo trail, the fact that Conjunctivius is still in chains when the player reaches the Insufferable Crypt and this lore room being part of the "Infection" room series and not the "Beholder" (Conjunctivius' old name) series suggest that the creature which escaped was not Conjunctivius. The corpse of Prisoner 236 is found close by: he presumably died while trying to escape.

Alchemist Grimoires
Main Article: The Alchemist

In the Sewers and the Ancient Sewers, the Alchemist was collecting mold and mushroom samples for his experiments. However, the growing numbers of revenants made his work increasingly difficult.


 * It is becoming increasingly difficult to collect mold samples in these sewers. There are too many revenants.

"Gollum" and the Teleportation Rune
Main Article: Gollum

When the Beheaded first enters in the Toxic Sewers, he meets an unnamed character (called "Gollum" in the game files, in reference to The Lord of the Rings) stuck behind bars who asks him to fetch "his" rune, heavily implying it is not actually his own. When the player kills the Elite Slasher who holds it, he later encounters the mysterious character again but refuses to hand him the rune. "Gollum" then warns the Beheaded will regret this and swears he will eventually get his rune "back". A lore room full of teleportation coffins can be found with his corpse, putting a sad end to this story.

Loading screen quotes

 * "Many believed the sewers were a path to freedom. No one ever made it out the other side."
 * "The prison dumped all its unspeakable filth into the lower galleries, so it's no wonder something horrible emerged from them one day!"
 * "A greenish substance oozed its way into a number of pipes along here... and it continues to spread."
 * "Hmm... is that... is that smell normal?"