Holy Water - While the core book gives damage values for holy water, they do not seem consistant with the show.  When struck with holy water most vampires howl in agony and flee.  Thus, when struck with holy water (Dex + Getting Medieval) a vampire must roll Willpower doubled and score greater than the attack, or beat the attack with their Brains score.  If they fail, they lose their next turn due to the pain and distraction.  The only action they can take (apart from stand there screaming) is to flee.  If desired, the attacker can try to throw the holy water directly into the undead's face.  This gives a -3 on the attack roll, but also give the vampire a -3 to their Willpower roll (or Brains score).