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.

Sicktongue has a long, forked tail with poisonous bacteria barbs on the end the same shade of orange as his eyes and wing tips. His long tongue and green scales form a scary, sickly appearance.

He enjoys napping on sunny rocks and spots on the ground. He's quite smart and prefers being alone more than with other dragons. Sicktongue is also a healer trained in medicine, but unlike the other healer, he only heals himself. Sicktongue is sensitive and hotheaded, yet gives many chances and warns other dragons he is angry and to not anger him further or he would attack. Not being that large, Sicktongue is quite weak. He is very determined and rarely gives up.

Sicktongue mainly lives on the jungle floor.