Board Thread:Lore Discussion/@comment-81.229.39.217-20150606205814/@comment-177.34.181.193-20150903030343

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The Dragonborn is a result of two Aedra:

Kyne/Kynareth: gave mortals the ability to shout. As such, there couldn't be a Dragonborn without her doing so.

Akatosh: the father of all Dragons. The Dragonborn is a mortal with a dragon soul, meaning that he is somewhat bound to Akatosh.

Since he is influenced by Aedra, he should go to Aetherius.

However, the return of the Dragonborn was foreseen by an Elder Scroll. The Scrolls are known to exist outside time(and as such, outside the influence of the Aedra, since Akatosh is time), meaning that his/her ultimate fate is out of Aedra's control. This makes it unclear what happens to him/her after he/she dies in Nirn.