User blog comment:Morrowindman94/Was Alduin cool enough?/@comment-72.82.177.37-20120307034342/@comment-4511886-20120307222644

He's alive because he's coming back sooner or later to succesfully destroy the world(I think he's based of ragnarok which is the vikings name for the end of the world(to strengthen this theory it's said that a new world would be created after Alduin destroyes Nirn much like ragnrok).(This is said by a dragon (not sure which one) if you ask about why you didn't absorb Alduin's soul.)