User blog comment:J.C DENTON 4 LIFE!/Mass Effect 3 Possible Leaked DLC/Leviathan (of Dis?) DLC Spoilers!!!!!!!!!!!!!!!/@comment-4237253-20120627165038/@comment-108.48.15.158-20120627191043

It looks like completing this DLC also opens up some new dialogue with the Catalyst as well. Evidently, Harbinger is indeed the first Reaper and was created from the Leviathans that the Catalyst harvested. So much for "not changing the endings any further", huh? With any luck, Shepard could even use the Leviathan's information to convince the Catalyst to stand down and call off the Reapers himself. (It may not actually happen, but we can still hope for it. And quite frankly, that's all we can do at this point.)