Green Dragons are also sometimes called “earth” dragons. They usually live deep within caves, and have power over the earth. They are capable of launching boulders at high speeds, and can cause earthquakes by slamming down onto the ground.

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.

Y-Drag just can't help himself from unending yawning (hence the Y). The sleepy, green dragon has a rare earth dragon genetic disorder which causes this. The disorder causes his oxygen routes to his brain to form non-lethal clots which is why his body is always forcing him to try and consume more oxygen. Pretty much all he does is yawn. He cool like that.