Grathallas are predatory beasts who are primarily found on the surface of the Wajue Desert. Their voracious appetite for rodents, lizards, and birds keeps them constantly hunting. Their large beaks, sharp horns, and razor-like claws make them a challenging adversary for much larger creatures.

Though primarily interested in smaller prey, Grathallas have been known to attack and kill Sorcias when food is scarce. They will eat until their kill is completely devoured. Once ingested, the meal will be stored in the fat, slowly releasing nutrients over time.