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.

Chilly Bin is chaotic and emotionally aloof, known for his unparalleled skilled in ice magic and perennial grumpiness. He is the oldest resident of Norio Mosaic and believed to have had a rather unpleasant early life, judging by his comments alluding to some sort of strife that other beings will never understand. He is equally likely to roar at his springtime mate as he is to look soulfully at her eyes. He's one of the many dragons who don't stay with the lady after mating season. For other dragons, it's natural for partners to part ways, but for Chilly Bin, he likely isn't capable of getting along with someone for more than a couple of weeks. He is changeable, in the "fickle and capricious" sense of the word. Some optimistic dragons think they can change him while others frankly say that he needs therapy.