Originating from a single species that thrived in ancient times, Xenowyrms have become an incredibly diverse breed whose appearances vary depending on their habitats. Each Xenowyrm subspecies is heavily reliant on the power of different types of mana, making them powerful magic users. Aso dwell in the frigid waters of the far north and south, and are occasionally spotted near tundra shores and ice floes. Their isolated homes of choice suit their tendencies towards small family groups or being solitary. Their bodies are so cold they nearly instantly freeze anything they come in contact with, be it water or living creature. Over time, the ice that breaks off their bodies as they move forms into glaciers they use as lairs. The older an Aso is, the larger their frozen abode.

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.

Aeroxeno got his name for his aspirations to fly. Fighting through a sea that froze to his skin to huns whales and seals never appealed to him, so as soon as he was old enough to leave home he set off for a mountaintop glacier where elk were plentiful. At first he thought he would hunt the stratoses as well, but after meeting a fell who called them his friends, Aeroxeno started feeling too guilty to hunt them. An aquiloxeno by the name of Cryoxeno came out of the stratos flock and demanded they trade names, but Aeroxeno refused. He is amused to be named after an element other than his own, and while he was scared by Cryoxeno's dive-bombing at first, he soon realised she would never hurt him. He has taken to building a giant spire of ice so he can get even higher up. He thinks Cryoxeno is handsome and occasionally tries to court her. She says she'll agree only if he agrees to trade names. Sky Potatoe the stratos teases both of them.