This is an alternate version of Titanfall-Barons of Steel, which I recommend you read first, in order to get a feel for the characters and the material.
=========
When the Changelings attacked during the wedding, I thought all was lost. In the chaos of battle, my friends and I were separated. We had no idea what would happen next. The Princesses were captured, the Guards were overwhelemed...we had lost. We needed a miracle to get out of this alive.

And we got one in a way nopony could ever have predicted.

They came. And nothing would ever be the same, ever again.

Twilight Sparkle.
=============
When the Royal Wedding in Canterlot is attacked by Changelings, with the Princesses defeated and the Guard all but incapacitated, Twilight and her friends are separated in the chaos of battle during their search for the Elements of Harmony.

Little did the ponies know, that their salvation would come...and set the skies on fire.
=============
Titanfall 2 crossover, set after the Destruction of Typhon and in Season 2 of FIM. Will have blood and swearing.