Nebula Dragons are nocturnal creatures. With the best eyesight to be found, they are often seen staring into space. Each dragon tends to observe a particular nebula and will eventually change their colors and patterns to match it. As the nebula changes over time, the dragon changes with it. The more intricate the design of the nebula, the better chance an individual has of attracting a mate. It is said that the markings on no two Nebula Dragons will be exactly the same.

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.

Kuro Ana, meaning Black Hole, is a distant and aloof dragon who flies only at night, retiring in the day time to an unknown location. He rarely communicates to others, clearly preferring to be alone. It is thought that Kuro was involved in the great Space Wars as one of the major warriors known as Choshinsei (Supernova), but it was later confirmed false as he has slightly different markings then the alleged ones on Choshinsei. Little else is known of Kuro.