Board Thread:Skyrim/@comment-112.198.82.247-20130724121145/@comment-175.141.213.81-20140325131249

"Herma-Mora forced you to serve him in order to defeat Miraak. Do not let him lure you further down that path. The All-Maker made you Dragonborn for a higher purpose."

I think the Dragonborn can choose his own path after that, not tied with Hermaeus Mora. He could go on to Sovngarde like Tsun said.