Sheol
The Diabolical Plane of Sheol is one of the two Lower Planes, and is the home of all Devils. Sheol is a realm of Hierarchical evil ruled by the King of Devils, Yetzha. Below his are several other archdevils. Though Yetzha is the king he must constantly be on watch that his subordinates do not overthrow him. They are kept in line only by a shared hatred for the Chaos of the demons, and the goodness of the upper planes.
