Leviathan Add-On Will Change Mass Effect 3's Ending

Commander Shepard’s story arguably won’t benefit from Mass Effect 3 single-player expansions, but BioWare’s willing to compromise if you buy the Leviathan add-on: Completing the downloadable content creates an additional rift in your ending. Coming soon for $10, Leviathan’s story content is accessible early in the Mass Effect 3 narrative, and it adds even more layers to the war against the Reapers.

The question remains, though: Is Leviathan worth the hassle at all?

Admiral Hackett’s been running black ops on the hunt for an elusive creature known for killing Reapers. Nobody knows where The Leviathan is, but when a Citadel scientist called Bryson picks up the scent he’s promptly murdered. His loyal assistant blacks out and puts a bullet in his chest, totally unaware of his actions. It seems like a simple case of indoctrination, but the deeper implication hints at something else. From there, Shepard makes his (or her) way through new part of the galaxy.