Tri-Horn Wyverns are a mountainous species, living in high altitude areas among rocks and snow. The rough and rugged climate has bred a tough and hardened species, prepared to do battle with both the elements and other creatures. Their most distinctive feature is the three-horned crest mounted upon their head, for which they were named; these toughened spikes are powerful weapons, used to battle against predators, prey and fellow Tri-Horn Wyverns. Both males and females of this species fight for territory and resources, and wear scars with pride. However, Tri-Horn wyverns have a soft side beneath their many spikes. They work in loyal packs, of which they are deeply protective; if one can gain their trust, Tri-Horn wyverns can be powerful allies through the mountains.

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.

Kallistos isn't the friendliest of Damian's dragons, and in fact is openly sarcastic and hostile to most of his cavemates. Ever since he hatched, he has always felt out of place with them and frequently disappears to the mountains to find himself. He loathes any affection shown towards him and constantly talks about not being "part of the family." The only dragon he seems to tolerate is Anastasius, the Frostbite Dragon, who shares his love for the cold and solitude. The middle horn on Kallistos's head is forked slightly at the end, and he takes great pride in being a "Tetra-Horn Wyvern."