Black Dragons are warriors. They are strong and capable in battles of force, but also ample magic users, capable of devastating opponents with their spells. Their bright eyes give them excellent night vision, which is why they generally hunt during the night.

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.

BaiHei's name means WhiteBlack Color. His brother's name is HeiBai, meaning BlackWhite Color. The two are inseparable, always together. They skulk in the darkness, playing pranks on their younger sister, Hui Se, whose name means Gray Color. Hui gets angry with these pranks a lot, and then comes after her brothers with a vengeance that has very nearly killed the both of them more than once.