Void

The Void is everything between the planes of Oblivion. Upon the dawn of the third Era, the Void was partially materialized at locations by the Ideal Masters. The inhabitants of the Void are named 'Demons', although not all resemble the classical appearance of Demons. While the Void is infinite and mysterious, the following locations are known to exist within the Void:

• The Bladespire, ruled by its matriarch the Queen of Blades Priscilla of Blades. It is inhabited by the Black Steel creatures known 'Blades' and guarded by Saragons.
• Aldheim Prison, the place were Valthor resided after his banishment by the Heroes of Old.
• Barga Gor, a place ruled by the typical red-winged demons. It is the origin of the Balrog (Balor) and home to Uram the Red. 
• The Abyss. Little is known about the Abyss other than it being an endless darkness. The Abyss is possibly the only thing not directly or indirectly existing through the actings of the Aedra, Daedra or Mundra. It is therefore the purest form of the Void.