'Then we thought, let's take it to the next level. Being immortal beings, that's something they wouldn't want to see.

'Maybe the Reapers kept wiping out organic life because organics keep evolving to the state where they would use biotics and dark energy and that caused an entropic effect that would hasten the end of the universe. Maybe using this Dark Energy was having a ripple effect on the space-time continuum,' he said. 'Dark Energy was something that only organics could access because of various techno-science magic reasons we hadn't decided on yet. Speaking to Video Game Sophistry, as transcribed by Eurogamer, Karpyshyn said he hadn't fully fleshed out his plan for how to end the trilogy but that it hinged on the concept of 'dark energy', which is mentioned in Mass Effect 2 but not explored in the other two games. Some Mass Effect trilogy spoilers follow. Mass Effect and Mass Effect 2 writer Drew Karpyshyn has detailed the vague plans he had for the ending of Mass Effect 3 before exiting the project.