Leviathan (Mass Effect)

Leviathans are an ancient aquatic race that dominated the galaxy in the time before the Reapers. Proud and aloof, they regard themselves as the galaxy's first and only apex race, and think of other races as mere tools meant to serve them. Like the Reapers that were designed after them, the Leviathans are massive in size and possess a resemblance to Earth cuttlefish or squid.