Deep

The Deep is an outer plane with infinite layers which connect to one another in chaotically shifting pathways. There are no rules in the Deep, nor laws, order, or hope. The Abyss is a perversion of freedom, a nightmare realm of unmitigated horror where desire and suffering are given demonic form, for the Deep is the spawning ground of the innumerable races of demons. The Deep claws its way up into other planes through rifts in the fabric of space. These rifts are like steaming canyons boiling with tormented souls. They are as legion as the realms they unveil. One should not lightly approach them, for to gaze within is to look at what truth was before sanity infected it. This is where sin goes to die.

The Demon Lords rule vast stretches of the Deep, each in an eternal struggle with each other, and even the denizens of other planes and Gern itself.

The Deep is also well known as the location of the prison of Kalderus. His existence draws huge numbers of mad demons to chant eternally in prayer to him.