Prison Depths

The Prison Depths are an optional biome between the second and the third level.

Access and exit
The Spider rune is required to access this Biome through the Promenade of the Condemned. An underground section only accessible by wall climbing in the Promenade leads to the Prison Depths.

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

Iron cells
Two locked doors are found at the end of the biome, next to the exit doors to either Ossuary or Ancient Sewers (at 1+ BSC). These are Iron cells doors and contain loot in the form of a 2-item choice altar. If the player finds the Iron Cells key, which randomly drops from an enemy or secret in the level, they can choose to open one of those two and take (or recycle) one of the items inside.

While the key will most often fall from killed enemies, it can spawn inside wall and floor secrets as well.

Scrolls
The Prison Depths 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 Prison Depths based on difficulty.

Boss Stem Cells rewards

 * 1 BSC: Exit to the Ancient Sewers

Chests and loot

 * There is always a cursed chest at the beginning of the biome.
 * There is always one treasure chest or a 2-item altar.
 * There is always one item in a hidden area requiring the Ram rune, and another requiring the Spider rune.

Shops
There are always two shops (weapons or skills), one of them being in an area requiring the Spider rune.

Exclusive blueprints
The blueprint for the War Spear and the Oil Grenade are exclusively found in Prison Depths as they are looted from Hammers.

Enemies
In the Prison Depths, you will find many dangerous enemies, such as Slashers and Lacerators. In addition, Maskers and Hammers could be considered the iconic enemies of this biome, with the latter never spawning in any other location than Prison Depths. On high difficulties, Knife Throwers and Rampagers appear, making this level even harder to navigate.

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