Had a dream last night about a video game, kind of like WoW or Legacy of Kain. Every player is a vampire, has to kill & eat another player to live another day. If a player is killed while eating this way, then the killing player can fly and be invisible the next day, but the shadow is visible. There was also some castle/church in the middle of the world that was safe, there could be no kills inside, but the player needed to obtain soap and clean a dirty part of the castle to sleep there one day.