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.

Although it is unknown what this dragon's true name is, this Black Marrow Dragon prides himself of having the title, The Ruler of the Underworld'. It is very likely that this dragon gave said title to himself, and that the title is not his actual name; but, bringing up this fact to him causes whoever had the idea in the first place to perish within the next few moments. Within his pack, this dragon is the leader who takes command through brute force, and does not hesitate to silence any of his underlings that dare question his authority. He is rather uncaring towards his groupmates; he doesn't care for watching over any of the hatchlings the pack would produce, and whatever scavenge-able food he finds he saves for himself and leaves the scrap for whoever else wants it.