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.

Water Aliendragon is not the best with names. Her closest friends are called Blue, Space Dust Dragon, Green Copper, and Magic Dragon; those aren't their real names, just what Water Aliendragon calls them. She says that people are easier to remember this way, and she can focus her mind on improving her strength and magic skill instead. When she gets to know more than one individual of a breed, appearance, or species, she appends their nickname with numbers. While that's a bit insulting, some people are proud to be known by Water Aliendragon as Sea Lindwyrm 1 or Red Haired 1, since it feels good to be first.