Aria dragons are a brightly-colored and sprightly breed, perhaps most adored for their lyric calls. Their song-like melodies fill the areas they inhabit; their coos resemble those of birds, only more elegant and refined. They have fairly strong magical capabilities, but tend to reserve these strengths for last-minute defense, choosing to live their lives in simple peace. Arias, sticking to the tropics, typically live quite far from human settlements, giving rise to the previously held belief that they had gone extinct.

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.

After Leilin's egg was rescued from the wild by Kione and Ebony Star, the little pink hatchling was raised by the young dragons living in Wondrous' sheltered treasure store, which would later become a full-scale dragons' nest. Though it isn't obvious to look at this cheerful and energetic dragon, Leilin's health is quite fragile, which is why she's never been allowed outside of the cave. This has given her a rather naive and immature view of the world. She admires and adores Kione, who, truth to tell, spoils her somewhat. Despite her childish behaviour, Leilin has ended up as a big sister figure to the hatchlings who are not yet old enough to go outside. While not exactly perfect as a maternal role model, the consensus of opinion is that she is considerably better at it than, say, Ebby would be, though this is not saying much.