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. Gaia, despite their large size, are the lightest of all Xenowyrm subspecies. They possess the ability to use incredibly powerful life magic, though most of their efforts are concentrated; to them, nothing is more important than letting plant life thrive. Adult Gaia will use their magic to grow vegetation around themselves so they can spread it wherever they travel.

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.

Bajillion uses indefinite numbers a lot, especially for large amounts of something. His reasoning is that since no one can wrap their minds around anything bigger than a few thousand items, there's no point in speaking in not-made-up or exact numbers anyway. This is "proven" when he tells people he's nearly 24 million minutes old and then explains how many that is in years. At least Bajillion is polite enough to not bring up the subject unless prompted. When communicating casually, he says his forested region has a "ton" inhabitants and a "kazillion" trees and so on, and that works well enough for him.