Silver even one piece will do it nowadays. Of course, this was so heavily hinted at, the official revelation is almost a let down. Simon is brought up to be Mary s first victim. Mary fakes it. Drac doesn t notice.
Guys never do.
Mary lets Simon loose. Simon says, Let s fight. Simon gets tossed around more than a gourmet salad during an earthquake. Despite superior strength, stamina, viciousness, logic, etc., the Vamps die. Drac gets tangled up in a neon cross and hangs as the sun comes up.