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. Chronos are often considered to be the most elusive of all Xenowyrm subspecies: they live in the darkest and densest forests, far from civilization. They are masters of time magic, allowing them to manipulate the flow of time at will. It is said that Chrono lairs are protected by a field of magic that makes the minutes tick by at a slow pace for any unwanted visitors.

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.

Muda's egg was mysteriously left outside Damian's cave by an unknown egg hunter, and the Xenowyrm grew up with a burning desire to find him or her. He has no motivation for his actions other than his continual search for the one he calls "my guardian god." His control over time is so great that even Sappho, the Aeon Wyvern, is uncomfortable in the time field that accompanies his presence. Despite this, he often asks for her assistance in time-related experiments to slow time far beyond normal magical constraints. He keeps quiet about their purpose, but Sappho is convinced that he is attempting to reverse time entirely to catch a glimpse of who abandoned him.