Swallowtail Dragons are graceful and quick flyers, much like their namesake bird. They are capable of precise aerial acrobatics, and can reach very high altitudes. Because of this, humans observing these dragons are often astonished at how large they are when confronted up close. A Swallowtail’s diet consists of insects and small mammals plentiful in temperate forests. These dragons are also made remarkable by their paper-thin wing membranes, which allow light to pass through, creating an astonishing effect on starry nights.

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.

Grault is a member of a large enterprise providing many useful services. He's one of the younger, less experienced members who needs new tasks explained thoroughly to him, a trait that's belied by his gravelly voice and serious-looking face. While he is involved in many activities as part of his job, he doesn't like to get his hands dirty. When a client or outsider threatens Grault or his colleagues or annoys him too much, he calls on his personal hired assassin. He sometimes gets to choose the method of disposal, which can be fun. Though he might have a demanding tone when ordering the assassin around (due to the urgent circumstances), he always makes sure to say, "Thanks, Mom. Love you, bye!" as she sets off. If anyone overhears him talking, he claims that he was merely buying cookies from that nice lady. Things get complicated when somebody asks him for the name and rates of the "cookie seller" because they have some "hungry people" to "take care of".