The Abyss
The Abyss embodies all that is perverse, gruesome, and chaotic. Its virtually endless layers spiral downward into ever more appalling forms.
Each layer of the abyss boasts a horrific environment that is harsh and inhospitable to mortals. Each layer also reflects the entropic nature of the abyss. Much of the plane seems to be in a decaying, crumbling, or corroded state, and its corruption affects visitors.
Geography
The layers of the abyss are numbered based on the sequence of their discovery and cataloging by explorers. Thus, the Plain of Infinite Portals is identified as the first layer, Azzagrat encompasses the 45th, 46th, and 47th layers; the Demonweb is the 66th layer; and so on.
Ecosystem
There were myriad types of demons, too numerous to catalog here, but including the tanar'ri, obyriths, and loumaras. Non-demonic life could be found in the abyss as well, with both mortal explorers and captives and the petitioners brought there after death. Many wicked deities also based themselves here.
