User blog comment:Roxashasnoheart/Who would win? Alduin or Mehrunes Dagon?/@comment-67.236.1.188-20120612032151/@comment-67.86.65.177-20140112145325

No Dagon can't use the Thu'um. Dragonborn can use the Thu'um because a Dragonborn is the blessed one of Akatosh and has Alatosh blood. The other races were able to use the Thu'um as a blessing to mortals bestowed by Kyne (Kynareth)