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.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Thriller Killer is just as his name states. He is a 'Thriller Killer' meaning he kills for the thrill of killing. He loves to puncture the shell with his fangs and inject venom that kills the baby inside. He met up with Dolor Remorse in his early days and managed to woo her into taking him as mate. He knew that he would be the one on the throne with her if they were mates and he craves power as well as killing.