Shadowrealm

The Shadowrealm is a mysterious plane of existence. Although it is called "Realm", it is actually the empty space between Mundus and Oblivion, and Oblivion and Aetherius. Only a few things have been able to reach in the Shadowrealm. The Become Ethereal Shout is able to cast one's body in there, although the imprint of their soul remains upon the world. The Malum Ring of Eikius Revuine is the only known way to go in and out of the Shadowrealm at will. Not even divine entities, such as the Aedra and the Daedra, can see or reach into this realm, which makes it impossible for those who enter the Shadowrealm to be detected by anyone, even the gods. Things like time, space and reality are irrelevant in there, and as such, one could see into the past or the future, or then teleport through the Shadowrealm, though doing so is dangerous. Revuine is the only known Daedric Prince who has some control over it, although to what extent is still unknown. He enjoys manipulating things in Mundus and then watching the results of his actions unfold, a process which may take from just a couple of days to several centuries or even millennia to happen.