Type: Mystic realm
Environment: Hellish
Usual Means of Access: Magic; also accessible directly from Asgard through certain cavernous portals
Dominant Lifeform: The dead of Asgard
Prominent Inhabitants: Hela, Nanna

Comments: Among the gods of Asgard, those who do not go to Valhalla upon their death are consigned to Hela's realm. For a time, Hala even ruled Valhalla but Odin eventuaily reclaimed that realm from her.

First Actual Appearance: THOR #176 (where it is referred to as the "Sea of Eternal Night")