The Reapers are invading Equestria, intent upon destroying and enslaving the upstart ponies before they can affect the rest of the cycle. Unfortunately for them, Luna stands in their way.
I know a lot of people want a fairy-tale, all’s well that ends well ending to Mass Effect 3. I know, back when I first played through I sure did. That being said, it wasn’t destined to be, no matter how much the fans wanted it to be so. And I can really sympathize with Bioware here- because I feel they wrote themselves into a massive corner with the plots.
Now, first things first, as indicated by the ‘Crossover’ tag in both these stories, the opinions expressed here and in my two stories aren’t necessarily canon. So take what I portray in the stories, and what I am saying here, with a grain of salt- it can’t be wrong, or right, because it is essentially my own personal headcannon.
So, Celestia’s shield. Nice, isn’t it? If you’re being invaded by people that want to turn your home into a ball of dust through planetary bombardment, definitely.