Vampires are creatures of the night, they preffer to be alone or near their own kind if they are in a clan of some sort. To try and balance thing out, it should only be avaliable to experienced, high level players. Perhaps have some spell to resist the night so they can walk about during the day but don't have their unique strengths but still their weakness's.
You could also have Vampire hunters and other types of Anti creature. On thing is for sure, they should have Vampire and werewolf monsters as Npc's ingame.
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