Vampire Dragons are members of the undead. They sustain themselves by drinking the blood of others. It is said that they are only “alive” at night, and seem dead or asleep during the day, as they cannot endure sunlight for long periods of time. Vampire Dragons can only reproduce by changing the eggs of other dragons, puncturing the shell with their fangs and injecting venom that kills the baby inside.
He Who Is Sharp Of Teeth loves silver dragons, and wishes to keep all of those in the weyr as his mates. His love for them is somewhat mitigated by the fact that he also desires nothing more than to drink their magical blood until he glows with their deaths. He especially adores Lord Of Totality And Perfection and Lady of Destiny And Luck, two of the youngest silvers in the weyr, and brings the both of them his many kills, which the female finds terribly distressing, since they are often the human gamblers who just came to visit her. The male silver tolerates the vampire's affections, since Lady Of Destiny And Luck has foreseen that without their gentling influence, He Who Is Sharp Of Teeth will destroy the weyr.