The Realm of Atlos
The first layer of The Nine Hells, Avernus, is a vast charred wasteland of rubble over which the iron towers of the Dukes of Hell stand.
Legions of devils march across the plains in continual readiness for the next battle of the Blood War. A red light suffuses the sky and huge fireballs fly across the layer, randomly exploding wherever they hit. Beneath the blood-red sky balls of fire burst unpredictably.