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.

Eos is the kind of dragon who knows how beautiful he is and loves to flaunt it. He's the vainest of the vain, often too absorbed into grooming himself to notice anything else. When he isn't fastidiously tending to his looks, he's showing off his flying chops in racing and other games. Eos is a fantastic flier, especially when it comes to acrobatics and putting on a show. That's pretty much how Eos sees himself and his life: he's the star and his life is a performance. This is emphasized by the dramatic way he speaks and acts, along with his general lack of touch with reality. It's this absorption into fantasy that draws him to his mate, Ballet, who fully indulges his fanaticism in the worst way possible. Eos pretty much lives in his own fantasies, and he may never be able to be pulled out, not while Ballet keeps setting the stage for him with over exaggerations and tall tales to keep his mind running wild and his narcissism at peak performance. The two of them are oddly dangerous.