Black Marrows are named for their dark colored hides which are encased in a distinct exoskeleton. Their skull and the top edges of their spine push out from under the skin as they age. As such, their young need excessive amounts of calcium for this armor to develop. The older a Black Marrow dragon is, the more skeletal their appearance. They often use their skeletal looks to lure in foolish scavengers or terrify predators. These vicious dragons love nothing more than to crack open bones with their stony beaks and eat the marrow inside. Voracious scavengers, Black Marrows will swarm and devour corpses both old and fresh, sometimes even dragging larger finds to the water to allow them to “ripen.” Despite their dreadful demeanour and often horrid stench, Black Marrows are devoted mates and parents.

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.

Having been captured by humans at a young age, Aceon has lived in captivity almost all his life. Once he grew too large for the humans to handle, his keepers released him back into the wild. However, the long years of being held in a small cage had left him as helpless as a hatchling, and it was only thanks to the Thoiris clan's collective efforts that he survived.

To this day, despite the kindness shown to him by the clan, Aceon has remained distrustful and unwelcoming towards humans as well as other dragons. Often, he feels like a burden, and he usually avoids dealing with others as best as he can. The only ones he accepts as friends are Mariel, a black dragonness he knew as a very young hatchling, and Fanthesi, a silver who has once bravely saved his life.