Board Thread:Lore Discussion/@comment-30652140-20161201185058/@comment-1255618-20190421040000

@Twilight Despair 5

Lo and behold, Varieties of Faith in the Empire confirms that what's left of Magnus on Nirn is what allows mortals to feel and control magicka and use magic. Your theory confirmed by an in-game source, you perceptive thinker you! :D