Something lurks in the dark corners of space something powerful enough to kill a Reaper. Shepard must discover the most closely guarded secret in the galaxy before the Reapers silence it forever.Mass Effect 3: Leviathan expands upon the events of Mass Effect 3 with gripping and emotional storytelling compelling new characters and powerful weapons and upgrades. Unravel the dark history about the Reapers as you race across the galaxy to discover the Leviathan.