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.

Roserine will fiercely protect hatchlings that she has befriended. She will also fly the herbivorous ones to the same trees she feeds from if they are having trouble eating. If her owner's dragons are attacked, she carries the hatchlings to a safe distance away. She can inflate quickly to take baby dragons away from danger. Instead of fire, she breathes poisonous gas which increases the range and power of other dragons' flames.