So the planet doesn't rotate? How would that affect the mass of the planet if the living vampires are always avoiding the light on a rotating planet? Maybe that is what powers the rotation?
It can be like the moon, where there's one half that we never see. The speed it rotates around the sun can match the speed at which it rotates on its own axis
orrr the vampires live underground, under the flesh of their fallen brethren
Wouldn't the sun have killed it?