User blog comment:Arbington/ME3 Theories/@comment-899316-20100629185900

If dark energy is to be used against the Reapers, how? Here's one idea: The Collectors had Reaper tech, and thus, would've stood a chance against the Reapers had they not been mindless slaves to Harbinger. But, with the Collector Station not destroyed, humanity would have access to that technology. And we aren't Reaper drones. Thus, we have access to weapons that can actually deal some damage to the Reapers. Also, the Normandy SR2 was upgraded to the extent that it could take down the Collector Cruiser, and thus, might be able to take down a Reaper with a little skilled piloting, courtesy of Joker. This is only one way the Reapers could be dealt with, and in the game, there may quite possibly be multiple endings due to actions in the previous games.