Hellfire Wyverns are so named for their foul tempers and fiery visages. Their social structure places all females above all males, due to superior physical characteristics and violent dispositions. Forced subservience of the males causes them to become vicious, petty, antisocial, and passive-aggressive compared to the aggressive and social females. However, orphaned hatchlings raised by foster parents of another species can develop surprisingly even tempers and mellow dispositions, proving that their defining unpleasant nature is, in fact, a learned behavior.

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.

Hellrusher is the most ferocious dragon, ranking way above Mizuaru. He's basically the guard dog people want. He prowls the grounds of his owner's camp at night to keep out intruders. Despite being raised by his owner, who is mostly a very calm person, he seems to have spent a lot of time together with Mizuaru and taken the Water Dragon's fiery temper to the next level. He's a force to be reckoned with on the battlefield, having the hottest flames in the entire pack. Hellrusher is the dragon no one wants to meet alone in the wild on a very dark night.