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.

Sweeney is an outcast who is avoided by the others- and he wouldn't prefer it any other way. He was laid a white egg, but after being turned by another vampire's fang he was left clever in the workings of the body, but without the compassion of his original breed.

He is a bloodthirsty creature that plays a clever game-a deadly game. When his hunger becomes too much to ignore and he must feed, he will hide among the shadows of unoccupied caves, waiting for an unsuspecting hatchling to be abandoned at the entrance. He will use their curiosity to lure them away from the light-and into his jaws. He has never been caught at this deadly game, though the other dragons are still suspicious of the faraway cave decorated in bones. Although Missus Nellie Lovett fancies herself his companion, he would rather she left him to his own brooding- she is nothing but a distraction to him.