Mass Effect au where instead of the Starchild, Shepard finally gets indoctrinated by the Reapers at the very end and you have to play as the squadmate with highest relationship points or their LI to stop them.
If your ems is high enough, you can break through the indoctrination and bring Shepard back to stop the cycle.
If your ems is too low, you have to stop Shepard.
Permanently.
And it falls to you to activate the Crucible.
I got a new drawing tablet!
dodges pitchforks
part 2, low EMS Destroy ver.
part 3, low EMS epilogue
(I know I said the last one was the last but @rackofages had an idea)