Quote from the dictionary: "VAMPIRE m. a flesh-eating, flying mammal of hot countries, from the family of bats, resembling a bat but the size of a squirrel; a bloodsucker, a ghoul; the latter name is used in Little Russia (and in the southern Slavic lands) for a mythical werewolf who possesses superhuman strength and, after death, flies around as a bloodsucker, biting people; a sorcerer." Plus, in the game, there is no change of time of day, so you could say that the heroes only travel during the day. And necromancers too, but vampires don't die?