Board Thread:Lore Discussion/@comment-24267938-20130808174809/@comment-14027812-20130809120130

Given the things hat have happened over the games,i would say that they all have of plane of Aetherius to go,but this procces is somewhat left unnexpressified.Many people often miss their carriage to the heavens and become sutck in Mundus,only to be freed upon a certain action afterwards.This action often requires killing them a second time,however,others,such as Katria and Helgi are bound to a certain person or object.

I truly don't know for sure how to answer this.As in real life, TES post life events are pretty much stubs to us.