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.

Ava has received the epithet "Ryuumansei" or "Dragon Vine Star", suiting to the type of dragon she is.

Spending the majority of her time, underground, it is unknown what she is doing or how she interacts with other dragons. However, it seems that she has a great hatred to animals or humans who dare to enter her territory. If someone dares to set a foot on her grounds, she appears out of the blue and kills that person mercilessly. The only person who has entered her territories and has come out alive to tell the tale is her owner.