The Leviathan (Grampus immanis) is a large, carnivorous whale that resembles its non-Awakened cousin, the Killer Whale (Grampus orca). It's an aggressive hunter, preying on not only walruses and seals, but also smaller whales, including its own cousin. Due to the size of the creature, it's only known natural enemies are krakens, megalodons and metahumanity.