http://www.imperial-library.info/tsosk/chapter06.shtml
However, I also think that the "self awareness = mortal form" is supported in the KotN expansion. Think about the only knight without his old form...
Spoiler Berich? The only insane one?
:shrug: That could be shown as some supporting evidence for it. I know that it is pretty much all speculation, but that makes enough sense to me that I am looking in the Imperial Library right now to see if there is anything to back it up.
Evidence from previous games, notably morrowind and the tribunal expansion with its multiple talking creature ghosts (who looked just like the crazy kill on site ones) indicate that this hypothesis of yours has been contradicted.
In oblivion, creatures can't talk, so its necessary to make them an NPC in order for them to communicate. This is pure game mechanics, and is best considered a quirk in oblivion's presentation of tamriel that is not reprsentative of what actually is. You are reading way too far into this.
Come to think of this, is actually applies to Morrowind.
Ancestral Ghosts look like wraiths, but Dwemer Ghosts are spectral Dwemer.
Not really, as there is no difference between crazy kill on site dwemer ghosts and talking ones, adn theres no difference between talking ancestor ghosts and blood thirsty maniac ones. They are also both creatures. The only difference is that ones a dark elf ghost and ones a dwemer ghost.