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.

A strange creature, this female is the result of a breeding between a black Sweetling and a Marrow, and as such has had some difficulties coming to terms with her nature. Her father's genetics encourage her to kindness, but her mother's more dominate ones encourages her to kill and eat whatever she can. Troubled by this for a long time, she has finally resigned herself to the reality that all life dies in time, anyway, so as long as she's quick and clean about it there's not too much evil in killing for food. Her darkly practical view of the nature of time is what caused the locals to give her her name: Cronis.