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.

Deoh, one of the three founding members of the Academy of Vampire Research and Instruction, harbors a keen interest in the properties of light and electromagnetic radiation. Non-Vampire dragons are of course permitted to conduct their own research at the Academy, and Deoh works closely with some of them, trying to develop a material that Vampires can use to block the sun's rays, allowing them to walk in the sunlight. So far, her efforts have been fruitless, but she is determined to help her kind be seen as 'normal,' despite their bloodthirsty habits and her own struggles with her instincts. Because of her long working hours, she often forgets to sleep or eat, and sometimes has to be escorted home to prevent any mishaps along the way.