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. Chronos are often considered to be the most elusive of all Xenowyrm subspecies: they live in the darkest and densest forests, far from civilization. They are masters of time magic, allowing them to manipulate the flow of time at will. It is said that Chrono lairs are protected by a field of magic that makes the minutes tick by at a slow pace for any unwanted visitors.

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.

Ambitious, wise, and appealing to the eye, Chrome is the second Xenowyrm owned by Biscuit. Due to his power and wisdom, he was named Cave Keeper of Time, in which he hides in a secluded patch of forest and tracks the movements of the moon, calculating the year, to the month, to the week, to the day, to the hour, to the minute, to the second. They are the voice of reason to Nikita's outbreaks. Chome is also well known for collecting relics from the forest, keeping them for further analysis and holding them as trinkets to adorn his well hidden home.