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.

Casynch is a Bright Breasted Wyvern and the twin brother of Carabaxas. As a hatchling he was something of a bully, and often harassed his brother and the other hatchlings in the family. Muscular and stocky, he was larger than many of the other hatchlings of his age and he took full advantage of that by grabbing the best food, sleeping and sunning spots and scratching rocks for himself. His favourite victim was a dark blue and copper hatchling with a bad temper but a size too tiny for her temper to be of any effect. Casynch derived a lot of amusement from needling the little hatchling, Fierva, and watching her rage as he held her back with a single paw. However, the tables were abruptly turned when Casynch reached his full size. But Fierva the Hellfire Wyvern went on growing. And growing. And growing. And then grew some more. She has not forgiven Casynch his bullying, even though he has certainly learned his lesson, and attacks whenever she sees him, making him hide for most of the day.