Board Thread:Lore Discussion/@comment-24489208-20130717135335/@comment-10665477-20131218155448

if you look at an elder scrolls concept of the universe, you see that Oblivion is in-between Aetherius and Mundus. I think Azura's sphere is actually maintaing her plains in Oblivion so that Aetherius and mundus do not overlap. she keeps them apart. When magnus tore a hole in the cosmic fabric directly to aetherius, it was a profound violation of azuras power. In order to keep the mortal and immortal planed from overwhelming each other AND fulfill her duty, she took on the work of moving the part of Aurbis where the hole was. This caused the planes of aetherius and mundus to not be maintained apart cleverly, as she couldnt defy the will of an entity so powerful as Magnus (albeit near-dead of the exhaustion of creating Mundus). Recapitulating: azuras sphere is keeping mundus and aetherius apart. She maintains this state by causing the cycle of the sun.