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.

Hydrogena is filled with nobility.  Well, a noble gas anyway.  She lives her life floating around, eating this and that from the trees, and bouncing around in the woods and canyons.  The only unpleasant part about her life as a Balloon Dragon is the...embarrassing way the gas inside her is released.  Her belches can be heard for miles.  Well, at least it's better than the OTHER way out which she'd rather not even consider.