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.

Part of the first 2 marrows the Warlock got, as well as Arzur's sister, Gemina holds a very high rank in the cave. She's very serious, calm, and gentle. She tolerates her brother and the energetic hatchlings, as well as helps care for the eggs.

She's a major leader, and what she lacks in size and beauty, she makes up for in wit. She constantly outsmarts all the other dragons, even the guardians. This makes her the undisputed, respected, and adored leader. She loves her owner and brother  Though she doesn't often show it dearly, and will spend long afternoons and nights, being used as a pillow by the warlock while he reads or writes.