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.

A wandering dragon that chose to establish its territory near the Neried Clan's cave, Bicenturion isn't officially a member of the clan, and at times, is even in outright competition with them.

For a humorous but irritating time, Bicenturion and the clan's resident Electric, Thunder, and Storm Dragons were all involved in an intense weather rivalry, throwing the surroundings into chaos and chasing off many sources of prey. This event was finally put to a halt by an infuriated and starving Vovern Sharptongue, who stormed past the clan dragons and personally knocked an off-guard Bicenturion out of the air.

To this day, Bicenturion can only be seen menacing the skies around the cave if and only if Vovern isn't napping outside.