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.

Tumultuary doesn't usually pick fights with other dragons and keeps his tail tucked at his side on most occasions, except there is that one dark green female who's taken "his" spot of sunshine. The two just usually engage in banter and trash talk, though on very comfortable, sunny days, they tussle over the spot. The fights always go the same way: fever and dark green growl and get nose-to-nose—someone makes the first move—dark green constricts fever with a bunch of vines—fever whips tail at dark green—both are out like snuffed candles and share the spot. What intrigues the other dragons is that no matter how many altercations take place between the two, neither seems willing to kill the other. Perhaps both just have thick skin and robust immune systems, or the scuffling has become a ritual of some sort. Some aren't certain that they're fighting at all.