Prison Depths

"The worst prisoners were locked up here, in the company of the worst guards."

The Prison Depths are a biome between the second and the third level. They can be visited between the Promenade of the Condemned and the Ossuary, but they are an optional biome.

Another underground dungeon. There is a metal door that can be unlocked with gold for a large amount of cells.

Access
A Spider Rune is required to access this biome through Promenade of the Condemned. Also, it one can be skipped by using the passage with the Teleportation Rune instead.