The Elder Scrolls
Aetherius is the Immortal Plane, thought to be the origin of all magic and arcane arts. The stars and the sun of Nirn are thought to be holes into Aetherius left by spirits (notably Magnus) who long ago became dissatisfied with Mundus. It is a common belief that the soul of a dead person, assuming they are not earthbound for some reason, goes to Aetherius, to continue on as a spirit. Aetherius, much like Oblivion, consists of a multitude of realms which serve different purposes, except they are all “of everlasting imperfection”. For Nords, their chosen place in Aetherius is called Sovngarde, the Hall of Valor.
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