Well, so far I haven't applied any vampire weaknesses to my char because my char is not undead. Master vampire removes any weaknesses anyway as part of the template. Anyways master vampire is not part of any book but more a WotC article. Here is Link (http://www.wizards.com/default.asp?x=dnd/mm/20021018a) for the template article.<br/><br/>P.S Sorry, it's called The Vamire Lord template. Master Vampire is PrC from Libri Mortis.