User blog comment:RayShepp654/How to defeat the Reapers Theories/@comment-730941-20101027124716

Came a bit late to this discussion, the new skin has hidden the 'Purge' button and new blog posts weren't showing up -_-

I'm inclined to agree with 'dark matter' playing a significant role in ME3 in some form, perhaps as a gigantic superweapon (imploding star near Haestrom, etc) - unless it's a red herring to keep us from the real Reaper-killing weapon ;)

As for other theories, I can only think of EDI and some sort of Reaper-disabling virus, delivered by Shepard personally to Harbinger's physical form (infiltrating the Reaper and fighting indoctrinated soldiers, presumably) and one last glorious fleet battle to destroy the immobilised machines. This would be the more epic conclusion, and give the player a major role (instead of watching a fleet battle cutscene).