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.

Aeternalis Fuel believes that there must be some kind of fuel somewhere in the universe that can burn forever and produce an infinite amount of heat and energy. He has named this hypothetical fuel the 'Aeternalis Fuel', which means 'endless' or 'forever'. In fact, he is so dedicated to searching for such a fuel that he has been named after the almost magical fuel that he seeks. Using gigantic stone telescopes and an array of assorted tools, he measures stars and their brightness, hoping that one of them burns on aeternalis fuel and will therefore shine much brighter than the others. He even changed his nebula pattern to a star cluster that he suspects contains this fuel, and will constantly look around himself during the day, when the stars are not visible, to study this star cluster. The only problem is, the star he suspects is on the back of his head, and no matter how much he tries, he can never see it!