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 Chills isn't very on-board with attacking things with her tail. To her, it's almost cheating, like having millions of little minions do the work for her, and it doesn't seem very nice to keep someone in pain for so long. Thus, she exercises her wings and hind legs so she can kill potential food in the same way as her copper companions. The fever wyverns think she's unnatural, so she doesn't get any action come mating season. Fever Chills has a crush on a dragon that humans call a "radiant angel". She doesn't know what an angel is, but if she did, she would agree he's a radiant one. Okay, maybe his power of intuition doesn't seem to work too well. Maybe he's an incompetent magic user. And maybe he's weirdly quiet. But anyone who defends bullied dragons and can put up a good fight gets points.