Bright-Breasted Wyverns are a breed of dragon easily recognized by their bright red markings. They are a small breed, only the size of a full-grown man. However, they have developed poisonous barbs on their feet to make up for their size. Their coloration is used to warn off potential predators of the danger, and is also used to attract mates. They are very social, and can often be seen preening in large groups.

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.

Das kalte Herz is a very nice dragoness who loves to help others, for example; caring for hatchlings or looking after other dragons' eggs while they're hunting. Even the argumentative cave's boss, I'm hurting you, likes her very well and would never be rude to her. Das kalte Herz is secretly in love with Tearjerker, but she'd never admit it because she's very proud and would hate to be humiliated.