Balloon Dragons are so named because they are filled with a gas that makes them almost lighter than air, similar to balloons. However, they are not prone to bursting, as they are covered in tough skin and can deflate themselves if necessary. In addition, they generally are slow moving. They use their gas bladders to float to the tops of trees, where food is more abundant. They can shift their weight from their backs to their fronts, allowing them to reach leaves and fruit.

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.

Rotundum is a glutton, no doubt. But his capacity for food is rivalled by his capacity for delight, and he is one of the most playful, high-spirited members of the pack.

He is a favorite of the hatchlings, whom he allows to bump him around when he is inflated. Much like a great big living ball, he richochets off the cave walls and rolls about in crazy patterns, keeping the little ones active and away from dangerous yet intriguing things like Altavina's snares or Orifold's delicate tail. Their squeals of laughter echo off the walls and let the adults know that their young are safe and happy.