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.

While Amakaji can fall asleep in pretty much any spot so long as there's sunshine overhead, she very much prefers sheltered areas that are difficult to access. After all, the more hassle there is to get somewhere, the less likely someone will come bother her when she is at that somewhere. To this end, she's made her home in a remote set of caves in the jungle highlands, complete with a little napping nook with a convenient skylight crevice overhead. To dissuade intruders, Amakaji piles the entrance with dead foliage and food remains, laced with her Fever Wyvern poison. While this works to keep out nosy interlopers, Amakaji unfortunately can't do much to keep rain from falling into the napping area through the skylight. At this point she's willing to just accept that it's impossible to have a perfect napping spot.