Board Thread:General Discussion/@comment-79.160.190.167-20130802230901/@comment-10789912-20160103194128

The end of Dragonborn quite literally says what happens to him.

He is stuck in Apocrypha. He is H.Mora's new servant. He might have entiamorphed with Miraak. He is trapped forever.

The reason you are able to leave? Simple. Gameplay choice. Bethesda won't have a free roam game that doesn't let you play after beating it, after seeing the backlash to Fallout 3 and NV.