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"Donating your body to science" takes on a whole new meaning when you're still alive.
The guards were the first to succumb. Unless no one noticed the difference in the prisoners...
It's unthinkable that even the stones are infected.

Corrupted prison flag.png

The Corrupted Prison is a short, optional biome between the second and the third level.

It's accessed through Toxic Sewers using the Spider rune and leads to the Ancient Sewers or the Ramparts (1+ BSC).

General information[]

Access and exit[]

The Spider rune is required to access this biome through the Toxic Sewers.

There are two exits out of Corrupted Prison. Typically, the player will leave by the main exit, which leads to the Ancient Sewers. With at least 1 BSC active, another door (always close to the Ancient Sewers exit) can lead to the Ramparts.

Iron cells[]

Two locked doors are found at the end of the biome, next to the exit doors to either Ancient Sewers or Ramparts (at 1+ BSC). Behind both these doors there is a 2-item choice altar. If the player finds the Iron Cells key, which randomly drops from an enemy, they can choose to open one door and take/recycle an item inside.

Level characteristics[]


The Corrupted Prison contains only one Power Scroll, obtained through the cursed chest at the start of the biome.

Enemy tier and gear level scaling[]

In the table below, you will find the gear level and enemy tier of Corrupted Prison based on difficulty.

Difficulty Normal Hard Very Hard Expert Nightmare/Hell
Gear level III III III IV VI
Enemy lvl tier 8 - 9 11 - 12 12 - 13 14 - 15 15 - 16
Enemy Health tier Base 9 - 11 13 - 14 15 - 17 20 - 22

Loot and shops[]

Main level[]

  • 1 cursed chest at the beginning of the biome, right before the one-way door.
    • Not affected by the damned Aspect.
  • 1 weapon or skill shop around the halfway point of the level.

Boss Stem Cells rewards[]


Arguably the most dangerous and lethal enemy of the Corrupted Prison is the Slammer, as (for such an early biome) it has very high DPS, and its attacks cannot be parried. This is worsened by the Protector that can spawn between large groups of enemies, making it easy to get swarmed by fast, tanky enemies.

In the table below, you will find which enemies are present in the Corrupted Prison 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.

Enemy Normal Hard Very Hard Expert Nightmare/Hell
Zombie Blood Sword, Double Crossb-o-matic, Bobby Outfit (1 BSC)
Rancid Rat Porcupack
Toxic Miasma Barbed Tips
Grenadier Fire Grenade, Magnetic Grenade
Shocker Flamethrower Turret
Slammer Flawless, Tactical Retreat
Protector Corrupted Power, Explosive Decoy, Warrior Outfit (3+ BSC)
Weirded Warrior Hattori's Katana, Blade Master's Outfit
Inquisitor Lightning Bolt, Vampirism, Mage Outfit


  • Because v1.5, the Corrupted Update, decreased the amount of Cursed Chests, there is always a guaranteed one in the first room of this biome. To the right of the chest there is a door that will close behind the player, no matter if they had or hadn't inflicted the curse upon themselves.
  • In the alpha and beta branch of v1.5, this biome was known as Corrupted Confinement[1].



  • 1.5: Introduced.


  1. The Corrupted Update Official patch notes, 2019-10-09
Prisoners' QuartersPromenade of the CondemnedToxic SewersDilapidated ArboretumTBSPrison DepthsCorrupted PrisonRampartsOssuaryAncient SewersMorass of the BanishedTBSBlack BridgeInsufferable CryptThe NestTBSStilt VillageSlumbering SanctuaryGraveyardFractured ShrinesFFClock TowerForgotten SepulcherCavernRotGUndying ShoresFFClock RoomGuardian's HavenRotGThe MausoleumFFHigh Peak CastleDerelict DistilleryThrone Room
Exclamation.png Spoiler: True Ending (5 BSC) AstrolabRotGObservatoryRotG