Pandemonium

Pandemonium was the dismal seventh layer of the Nine Hells, Outer Planes suffused with negative energy. It was a plane of incomprehensible madness, and the only one of the Nine Hells that was inherently chaotic evil in alignment. Endless tunnels wormed their way through the blackened granite of Pandemonium, maze-like and haphazard. Open spaces were filled with howling screams, and winds strong enough to carry creatures down tunnels, forever lost.