Board Thread:General Discussion/@comment-79.160.190.167-20130802230901/@comment-26987392-20151004055747

For those who say that Daedra have power over db souls using Miraak as example, you're wrong. As Miraak was about to die, Hermaeus Mora transported him to Apocrypha. Miraak's soul wasn't trapped there. So probably the DB won't go to Oblivion unless it is of his/her will.

Sovngarde? If the Last DB is a nord, perhaps. At the end of the main quest Tsun says he'll be waiting for you(LDB).

The Void(if he/she befriends Sithis)? Maybe. Since Sithis is in a greater level deity-wise than Aedra or Daedra, his will may overcome that of any Daedra the DB may have became Champion of, as well as Akatosh(being part-dragon).

His/her soul could even stay forever on Mundus, reborn in another mortal body, just like dragons.