The launch of the first post-launch single-player downloadable content (DLC) for Mass Effect 3 (if you don’t count the Extended Cut) is only days away. Today, EA released a launch trailer for the content that shows off a little of what players can expect in terms of story and setting.

In Leviathan, which is set during the events of Mass Effect 3, Shepard searches for a powerful weapon to battle the reapers. Shepard and crew will race across the galaxy, exploring new star systems and areas of the Citadel in search of the weapon. The origins of the reapers will be uncovered and, it appears, players will face an ancient reaper named Leviathan. Judging by the launch trailer below, the Leviathan DLC appears to be a dark, mysterious, action-packed side story for Mass Efffect 3.