Board Thread:Lore Discussion/@comment-62.31.43.199-20140124070928/@comment-26038979-20150124144411

Hooded Thief wrote: Some say that he is regaining power or is already powerful but dare not reveal himself

It is strange indeed. He doesn't appear in the book of daedra. He is waiting for something, perhaps an invasion of nirn. I believe he will make an appearance in Elder Scrolls VI, likely in a DLC, as an antagonist.