The Stockwood Scrolls
The Nine Hells, also known as Baator in Infernal, is the home of the devils. It is a plane of sinister evil and institutional cruelty organized in a strict caste system with a very rigid chain of command. Unlike the demons of the Abyss, the devils are highly organized in their quest for power and status: scheming and plotting power plays, coups, and assassinations. Each of the nine Hells has its own physical laws or properties of matter, but all are inhospitable or deadly to outsiders. Each is ruled by an archdevil, all of whom pay fealty to the Lord of the Ninth Hell – the dark lord Asmodeus.
The First Circle, the most outer level of the Hells, is known as Avernus.
The Second Circle is known as Dis.
The Third Circle is known as Minauros.
The Fourth Circle is known as Phlegethos.
The Fifth Circle is known as Stygia.
The Sixth Circle is known as Malbolge.
The Seventh Circle is known as Maladomini.
The Eight Circle is known as Cania.
The Ninth Circle, and most inner circle, is known as Nessus.