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.

Sekiryo sometimes leaves the caves at night to prowl around the coastal shores, as if searching for something. She holds an affinity for the ocean waters that she does not understand; it is believed that it is due to the species she was before her egg was bitten. She is the only dragon of Sylvain's family to constantly seek out the company of Zetsumei, the eldest Vampire Dragon of the clan. The family believes that the two are the most content when in each other's presence.