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.

Clover Emerald is often found outside the large cave, basking in the warm rays of the sun. She will sometimes go out to hunt if no other dragon is willing to. The disease on her tail is especially dangerous. The spikes are covered in Naegleria Fowleri, a brain eating amoeba. She wasn't always this nice though, she suffered the tragic death of her older brother. She remembers him all the time. Since their parents abandoned them as hatchlings, he always made sure Clover Emerald was fed and warm. But, one day, when Clover Emerald was close to growing her wings, an angry dragon found them in his cave. Her brother fought bravely against the much bigger dragon but, ultimately, the angry dragon killed him. Clover Emerald has nightmares about it to this day.