User blog comment:Roxashasnoheart/Who would win? Alduin or Mehrunes Dagon?/@comment-24551269-20120411193857

I think Alduin would win because he is basically the first-born of Akatosh, on the other hand, Mehrunes Dagon is a Daedric Lord.

The Daedric Lords resides in the plane of Oblivion and the Aedras resides in the plane of Aetherius, they have 2 different planes of existence, but for some reason I think Alduin would win.