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.

Asesinar is the first Vampire to be admitted to the Numeratis that was not turned by Cazar and Vidrio or one of their 'descendants'. He's a bit of a lone wolf--er, dragon, and much prefers the company of silence and solitude to that of the other Vampires. He is a successful turner, his first 'child' being a former White that he has some plans for. Asesinar is crude, to say the least, and isn't really that nice of a dragon. As a result, he gets along with Empire quite well, almost too well, in fact. There have been rumors of the two becoming 'mates' in the future, something that does not bode well for the other Numeratis or the horde if it does prove to be true.