Board Thread:Lore Discussion/@comment-24459775-20140315020817/@comment-24684538-20140317005339

That's a pretty good theory, although we also killed the Witch of Izalith, unless The Lost Sinner is one of the daughters (Quelaana maybe?). With Seath, maybe he was an illusion but why would the golems and channelers still be capturing people if that were true? Maybe his dabbling with the primordial crystal and research into immortality caused him to become some form of undead where he is recreated after death? And eventually his research to become truly immortal ending with him being petrified.

Unless time is so distorted that certain events never happened (such as Seath and the Witch of Izalith dying), although I think that's highly improbable.