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.

Marshall-Lee is well known in the Cave for being quite a character. Effortlessly cool, frequently outrageous and perpetually showing off, he is the very opposite of the more reserved members of his kind. Despite being a Vampire Dragon and therefore unable to breed, Marshall will also flirt shamelessly with any female dragon alive or (un)dead—especially his friend Fionna. Somehow, however, he is actually extremely popular. Most Vampires are shunned and rejected by 'ordinary' dragons, but Marshall-Lee is always welcome in any gang of friends. It is not only dragons who have been won over by his bad-boy charm; he takes pride in being one of his owner's absolute favourites.