Board Thread:Lore Discussion/@comment-24.28.166.230-20140201123431/@comment-13446185-20140202040117

I remember user:SajuukKhar saying that ghosts and many other undead beings are actually strong emotions left behind by their respective souls. Like Olaf's hatred of Svaknir and existence as a draugr, despite being in Sovngarde; this also explains the existance of Dwemer Ghosts (who never do anything but attack you). Though this probably doesn't apply to necromancy.

Unfortunately though I have no reference for this, but I normally don't argue with what SajuukKhar says.