Corrupted Prison

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).

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.

Scrolls
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.

Main level

 * 1 cursed chest at the beginning of the biome, right before the one-way door.
 * 1 weapon or skill shop around the halfway point of the level.

Boss Stem Cells rewards

 * 1 BSC: Exit to the Ramparts

Enemies
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.