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.

Thalareal resides in the Uniform Baylands, in a cove close to where his father lives, but not that close. He doesn't like when other dragons get ideas that he's riding on his dad's successes, and most of their interests don't overlap. He's far less sociable, having inherited his mother's preference for solitude, and is tenacious but possesses less of an experimental flair. He is a glacier and ice floe researcher, and the most noticeable contributions he's made in his work, at least to laypeople, is the set of signboards near the Yeoksa Glacier and informative pamphlets in visitors' huts throughout the Baylands. Thalareal is magically skilled and not a dragon to trifle with, but if anyone kept a "Thalassa Xenowyrm Power Ranking", he'd be on the low end.