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.

Donner is a troublemaker with a fiery temperament. He spends most of his time in hot, volcanic areas, but he is not a welcome sight when he is spotted circling above the forests and the grasslands of the Dragon World. He has a nasty habit of setting himself on fire before dive bombing small land-dwelling creatures as they run for cover. As his fire-clad body brushes against the trees and grasses they too, become wreathed in flame, causing widespread forest fires. Once he is happy with the damage he has done, Donner will retreat back to his natural habitat.

Donner's mate is a locally-living Red dragon called Haumea, whom he competes for with another Red Dragon male by the name of Pyrrah. It is believed that fights with the other dragon (and subsequently losing) is what results in Donner's need to torment innocent creatures.