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.

Despite Zenaida aurita's beliefs Acerodon humilis is not, in fact, waiting for a chance to pounce on him in his sleep and drain him of blood. To be honest he rather doubts he is even able to infect anyone, as he has no recollection of ever attacking another dragon. 'Ace' is surprisingly docile in nature and while unable to have children of his own with his mate  Aethalops aequalis, is quite happy to spend time entertaining the hatchlings once they are used to his intimidating appearance.