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.

Zakil is a notorious monster mostly known by one name: Question Mark, the Destroyer of Worlds. The origin of this nickname refers to the shape of his tail barbs, but it is unknown how exactly he received such an ominous title. Few dare to even say his true name aloud. He has been banned from most cities, and lives by himself in a cave deep in the jungle, lost in his studies. Whenever approached, which is rarely, he acts friendly enough, if a bit withdrawn -- giving no indication to his malevolent title. The mystery surrounding Zakil has added to the populace's fear, creating many legends as to what he did that threatened the safety of an entire world. The most popular is that he created some sort of mutant bacteria from his own strain and released it, creating hordes of undead from those who perished from the disease, but for whatever reason, question marks have become almost taboo to use in most cultures because of him.