Phlegethos

Phlegethos is a fiery wasteland filled with active volcanoes, hills of ash, gouting fires, streams of magma, pits of smoking excrement, and burning sand beneath a screaming rain of magical fire flakes. Lady Fierna and Archduke Belial are the lords of this layer. Few can exist here for long without suitable protection from the extreme heat. The fortress capital city of Abriymoch is built on the lip of a volcano and composed of hardened magma in the caldera of a volcano and is somewhat more bearable than the rest of Phlegethos.

The ground of Phlegethos is always uncomfortably hot. This, as well as patrols of barbed devils, keep most intruders constantly on the move. Tremors are common, and it is not unusual for the ground to violently erupt or fissures to open without notice. The sky of Phlegethos is a dark, starless void, but constantly leaping flames provide weird illumination to the harsh landscape