Marrowsaur is an ancient creature with a history spanning millions of years. It revels in the chaos and terror it creates on the battlefield. The creaking of bones heard when it moves is enough to inflict fear in even the hardiest of monsters. Long suspected to be undead (dead but still walking), there are only a few Marrowsaur individuals known in the Monster Ranch world.
Legend says that it was created by an evil sorcerer many years ago from the bones of a long-dead powerful dinosaur, and animated with demonic life.