Nine Hells

Nine Hells also known as Baator are lower plane inhabited by Lawful Evil outsiders known as Devils which are waging neverending conflict known as Blood War against Demons of Abyss.

Structure
Nine hells into nine infinite layers:
 * Avernus
 * Dis
 * Minauros
 * Phlegethos
 * Stygia
 * Malbolge
 * Maladomini
 * Cania
 * Nessus

Each Layer is ruled by Archdevil and all of them are ruled by Asmodeus.