Dark green dragons, once they mature, appear to become an entirely different species. However, this isn’t true. Rather, they burrow underground and get nutrients from their vines. These vines are sometimes referred to as Dragon Grass. These dragons are very violent, and will use their vines to capture, kill, and eat anything that moves, as well as nearby plants. Luckily, their range is limited and they cannot use magic. Dark green dragons tend to be easy to spot since they usually kill all plants around them and thus are usually surrounded by a large clearing.

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.

Vilie is special to the her clan, being the first to be born different. The leader of the clan, Igneous, has known about the alternate species of vine and black dragons, and has allowed the pair in the clan to breed. To vine dragons Midori and Chikyuu's surprise, their first egg, Vilie, was born different.

Vilie spends his time near his family, making a hole in the ground and resting there, letting his plants flourish off his back into the earth above. Vilie cannot speak, so it is very hard to talk to this mysterious but loved dragon.