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.

One of the most feared members of the Periodic Clan, Uranium is widely known as a ruthless, power-hungry, egoistical megalomaniac who stops at nothing to achieve his ends. Those who have been caught up in his schemes can testify that these tales are not, in fact, far from the truth at all—although, somehow, he still manages to convince dragons otherwise. Indeed, part of what makes Uranium so dangerous is his charming nature, if he's a little eccentric at times. Calm, composed and charismatic, contrary to the rumors portraying him as a raging madman, he has a confident attitude and a way with words that can make others blindly trust him. Accordingly, he's been recognized as a threat by the noble metallic dragons and banished to a deserted land beyond the Stability River, the Seventh Period; in response, he immediately put himself in charge, now the mastermind behind the dubious experiments taking place there. Nobody knows his reasons, although the noble metals worry about finding out soon.