Board Thread:Lore Discussion/@comment-24267938-20130808174809/@comment-11766202-20130820191040

It really does depend on how you lived, and just as much on how you died. Throughout the Dark Brotherhood questlines in IV and V, Brotherhood members say that when you kill someone that the Black Sacrament has been preformed on that their soul is sent to the Void. So, even if they lived their lives in service to the Aedra, they can still be sent to the realm of Sithis. As Psijic just stated above, most souls would be sent to whichever respective plane of Aetherius. However, I don't believe that the planes are race-restrictive. Although Sovngarde is hailed as the Nord Paradise, thats most likely because the Nords are a militaristic culture, therefore they'd be more apt to prefer such a life that is prerequisite to being sent to Sovngarde. The Aetherius principle, however doesn't always come into play. Take into account the Tribunal of Morrowind. These Three were worshipped by the Dunmer, but they had no otherwordly plane to call their own. So, assuming a Dunmer of the second or third era worshipped the Tribunal and never worshipped or made a pact with a Daedra, where would they go?

There's no certain answer behind this (to my knowledge) so there may be a realm of which we have no knowledge that souls would go to.