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. Astrapi are easily the most temperamental of all Xenowyrm subspecies. Their unpredictable behavior—coupled with their masterful control of lightning magic—has the potential for devastating results. Most of their time is spent airborne, flying through the skies or circling mountainsides for prey.

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.

Rathtar is not very bright and has a ravenous appetite. She might as well be a plated colossus with a worse disposition and powerful magic. Rather than fly, she prefers to curl her long body into a roundish shape and "wheel" around the mountainside, zapping and eating any creature within reach. She has an enormous mouth full of sharp teeth, but it isn't clear to observers whether she chews or just swallows prey whole. Said observers would rather not get close to Rathtar at all to find out. Fortunately for potential victims, her eyesight isn't very good, and she's easily outsmarted.