User blog comment:Blood Reaper/Skyrim Dawnguard Trailer/@comment-4353017-20120601103506

As a couple of ppl have pointed out, the trailer hints at a Vampire plot to blot out the sun, making life much easier for them. But blot out sun = plant life dies = herbivorous animal life dies = carnivorous animal life dies (so far, so dinosaurs) = no blood source for Vampires = Vampires die out. That's a veeeery convoluted way of committing mass suicide. Admittedly, it's only a game and normal rules don't apply...