User blog comment:Roxashasnoheart/Who would win? Alduin or Mehrunes Dagon?/@comment-24837490-20140924230241/@comment-24837490-20140928014241

First, the Oblivion Crisis was just a key to Alduin's Return. Alduin also says, "Even the Daedra fear me!" - although Daedric Princes are extremely powerful godlike entities, they are still Daedra. Alduin is the firstborn of Akatosh; Mehrunes was defeated by an Avatar of Akatosh, that presumibly didn't have even 10% of Akatosh's true power, so you could consider that Alduin probably could overpower the Akatosh's Avatar. The Hero of Battlespire even kicked Dagon's ass in his own realm, inside Oblivion. Plus, is needed the Dragonrend Shout to even hurt Alduin, and Dagon don't knows the Dragonrend Shout - you can be sure of this.

Dagon even tried prevent Alduin from eating the world, so Dagon clearly feared Alduin. The Last Dragonborn, at the end of the game (defeating Alduin) is probably extremly powerful.

Dragon >>>>>>>>>>>>>>> Daedra

Dragon God >>>>>>>>>>>>>> Daedric Prince

Alduin >>>>>>>>>>>>>>>>>> Mehrunes Dagon.