The upper levels are best known and are described in various mythologies. Often Earthly scholars will claim that some part of the abyss is ruled by prince-gods or that parts of the abyss exist as “realms.” In truth, the abyss is truly chaotic, without logic or arrangement. It is populated by cruel demons to move remorselessly and arbitrarily through the layers, and souls who have drifted from other lower planes into the Abyss, or who have been discarded in the abyss after their souls have been burned clean in Hell. Geographically the entrance to the Abyss is found beneath Tartarus, behind a gate that is held by Apollyon, the Keyholder.
Common souls of mortals exist as manes, but more powerful demons include vrock, hezrou, glabrazu, nalfeshnee, marilith and balrog, the names of which serve both as singular and plural when described. The number of demons is Legion, a name known to Christians as representative of an infinite number, like the planes they occupy.
Demon lords and princes move freely through all the planes, occupying themselves with pure hedonistic pleasures, never tiring of causing agony, unhappiness, the crushing of hope and the making of fear among the lesser demons who inhabit the Abyss.