It's dangerous for vampires to live so close to the humans in Runistra. If even a single spy for Falferyn made it through the caves and found the vampire's hideouts, things would be disastrous. So, in attempt to thwart Falferyn's forces, the caves dedicated to vampire living are moved magically by elemental witches and fairies. One day the caves will be to the north beneath the swamps and the next they'll be deep underground beneath Runistra. If you search for the caves you'll die trying. That's just the way the vampires like it.
