'Alien Vampire Stones'
First seen in a store on the Esael Space Station when Lexx decided to buy Chel something. These are stones often set into necklaces, and will prick you if you are the first they touch. (AD Day 11, strip 23) It does this to get a sample of DNA, from which it will compose your personal song that will change with your mood. It's warm and vibrates with the sound, with tones no Earth instrument can duplicate. Once set to someone, no one else can use it. (AD Day 11, strip 25)