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 a different type of mana, making them powerful magic users. Thalassas are a unique variety of Xenowyrm in that they are the only subspecies known to dwell in marine environments. Their porous skin and slender build are perfectly suited for the aquatic terrain, but they can only survive for short periods of time on land. Powerful users of water magic, they can create large waves and alter currents with a simple thought.

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.

Rhodolius is one family member of the Xenowyrm Trio in Ether-Equinox's pack. Being the middle sibling of the trio and being the only male, he is very mischievous and naive in nature, but he is the most intelligent in the trio. During training sessions on water, he often helps Imperius and Scryon on their decision making, as a result, Scryon agreed to teach him the basics of long-distance fireball shooting, but seeing as though Rhodolius cannot shoot fireballs because he's a marine dragon, both him and Imperius taught him to shoot strong streams of water instead. His unique abilities include rapid fire water streams and tidal surfing.