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.

She has received the Greek name "Nyx", which means night, and the epithet "Ryuuchisei" or translated into English: "Dragon Blood Star".

Due to light skin, she is unable to bear the sun. This is the reason why she always hides herself in the cave when the sun is still up. Furthermore, she isolates herself from the others, because she is afraid that the lethal venom in her teeth could harm others.  Unfortunately, she loses her control over herself in the evening, thirsting for blood. This is the reason why she flies away from the cave as fast as possible after the sun is down. Sadly, she is sometimes not fast enough and it happens that she kills dragon eggs, which have not hatched yet.