Hades

Hades was an outer plane in the Great Wheel cosmology of 1st and 2nd edition D&D. It was a plane of pure evil balanced between law and chaos.

Description
The layers of Hades are called glooms for good reason; they are realms devoid of emotion, hope, and peace. Grey land and grey sky throughout, with no sun, moon or seasons to break the monotony.

Layers
The land of disease, home of many daemons. This layer contains Kelemvor's realm, the Crystal Spire, which was formerly Myrkul's realm, the Suffering City. It also contained Urdsrest, the realm of the urd deity Kuraulyek.
 * Layer 1: Oinos

Among the roots of the world-tree Yggdrasil crawls Dendar the Night Serpent. This layer also features the Palace of Loss, Shar's realm, and Shadow Keep, the realm of Mask.
 * Layer 2: Niflheim

Sometimes called Hades, this layer features Rezuriel, the realm of the wicked sea-god Panzuriel.
 * Layer 3: Pluton