The Marrow, like the Volross, is a canine infused with the genetic material of undead monsters to produce a powerful mutant breed. Growing up to the size of boar, it can drag itself quite fast on its muscular forelegs and swing its spiked tail with enough force to punch a hole through concrete. If it bites down on another creature, it will never let go until the prey is dead or dismembered. It does not bark, but emits a deep, rumbling groan not unlike a crocodile. It enjoys gnawing metal to sharpen its teeth.