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. Mageia, found exclusively in desert regions, are thought to be the wisest Xenowyrm subspecies. Due to their knowledge of the magi element, they are able to cast a variety of magics, including teleportation. Their beautiful yellow scutes are reflective and smooth like glass, making them very valuable to collectors.

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.

Subunit enjoys putting things in order. If there is more than about ten of something that is placed somewhere, she will try to figure out a pattern to classify them along with any incoming goods. She enjoys thinking and writing up instructions and schemes, and fittingly, her hoard looks like an orderly curiosity cabinet, with a list posted nearby describing each item's characteristics. Subunit's neighbors feel she should busy herself doing something more constructive, as they put their belongings in piles without worrying about order. They don't push the matter nor do they try to mess with anything she organized, lest she unleash her Xenowyrm Fury on them. (She hasn't yet, but xenowyrms and strong and scary, so they take no chances.) Meanwhile, some repository employees in a town not far from Subunit's cavern network wish to meet with her to discuss how they may reorganize their holdings, but they're too afraid of approaching a group of dragons to try to set one up.