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.

Out of all the Vines in Kaoru's Cave, the wizardess Kaoru can get closest to Kozukyouku Hitomi-Un (Hitomi for short). Hitomi is a shockingly passive Vine with no quirks. She likes routine and dislikes change, so as long as she can take care of her favorite plants she does not complain. She is surprisingly friendly with strangers and, though she is always cautious, allows many humans to touch her vines. Perhaps she feels safe because of her mate, who she knows would instantly kill anyone who even joked about threatening her (though no one could tell unless they knew him well). Whatever the reason, Hitomi is kind by Vine standards and is sometimes shunned by other Vines because of this. Hitomi's favorite plant is the Red Grape Vine. She has one growing that is forty-seven feet long.