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.

Dark Lady Venom is a little out of the ordinary for a Fever Wyvern. She is very quiet and doesn't often join groups of dragons but has a soul mate, Dark Lord Bloodlust, which is rather strange for her breed. Venom is constantly surprising others with her speed and flexibility. She keeps to herself while her calm but monstrous husband looms behind her keeping most evil-doers off her tail. She very strictly trains any younger dragons and hatchlings that come to her. She is ruthless and appears to be a heartless teacher but does truly care for each and every one of her students.