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.

One Mockingbird, or called 'Mocker' for short, is the overall guardian and protector of the dragons in the cave. He is vicious and cunning, but uses these characteristics to warn off threats or fight them to their death. He has been raised in the cave as an egg and has a fondness for every dragon living inside, thus looks over any problems that he can help. A number of dragons is afraid of Mocker, due to his love of crunching into bones and never smiling. Some even believe he will become the source of a destruction of the cave, but other disagree, most looking up to him and thanking him for the protection and security he has given to the cave.