Each Fever Wyvern carries a unique and very deadly disease on the spines of its tail. To make up for a lack of physical strength, the dragons use this disease to their advantage by poisoning prey and fending off attackers. The illness will quickly render victims helpless before eventually killing them. A Fever will track its prey until the target can no longer move. Usually a solitary breed, these dragons will only come together during mating season, and will flare out the brightly colored sails along their wings to help attract potential mates. Although it has been observed that the wyverns are nocturnal, they will often pick an open spot of sunshine to curl up in and sleep as the day passes by.

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.

Fever Wyverns are notorious for tracking down prey that they have afflicted with their diseases, but few do so for the same reason as Oalgrax. This particular dragon enjoys watching his prey perish so as to observe the complete details of how his poison affects others. He has records of how a particular diet that month might change how the toxicity spreads through his targets or how different animals have different reactions and survival times. Extremely fascinated by the variations of his experiments, he shows very little regard for non-Draconic life outside of his tests.

His reports are accurate, aiding many foreign entities in developing cures for the Fevers for some of the breed (or in some weaker Fever cases, inoculations). However, he has not provided any information about his own particular form of disease, and most believe that he never will. Some even state that the cures he offers are merely to encourage others to expel the competition of any Fever Wyverns from his territory.