All vampires will one day go to Molag Bol for... some very unpleasant times. He'll get their soul then. What I wonder is why no vampire has ever had these thoughts: Vampire: 'When I die Molag Bol gets my soul. ... Maybe I should see about doing something about that. ... Hmmm... Maybe, destroying my soul? Yeah... That might work! Then he couldn't claim it at all.' Why has no vampire decided to destroy their soul? And thus deny Molag Bol their soul. And without one, he couldn't corrupt their personality either.