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.

Treeguard becomes cross when he notices humans chopping too many trees, seeing that as a threat to his domain. There is a small chance that felling a tree when he is in the same forest will make him appear suddenly and put the hurt on whoever is responsible, even if they took down only one tree. A powerful lash of his tail can knock over a person or kill them outright, and that seems to be his preferred method of attacking humans. Treeguard is large and slow, and he can only chase one enemy at a time, but he'll chase them to the end of the continent if they don't repent or die. To avoid his wrath, woodcutters may plant trees in his field of view to calm him, to demonstrate that they're replacing what's lost.