When the CMC asked Discord to help them attend magic school, he pulled an owl out of his hat. Only he didn't exactly have a hat. Which was okay, since their new school had a singing one laying around. Where the hay was Hogwarts anyway?
She looked just like Princess Celestia, except marred and broken. Her ceremonial barding had rusted slightly. Black streaks ran through her mane. Worst was the scar across her chest. The tarnished Celestia smiled at Luna. "H-hello, monster."
With Twilight and Ruby Sparkle settling into their new positions as rulers, they must oversee the transition of the bat ponies to their new home. But the next Shepherd will soon appear, threatening not only Equestria, but the other kingdoms as well.
It had taken two failed invasions, an arduous civil war, a foalnapping, and the promise of a date, but Chrysalis can finally be counted among Equestria's allies. Unfortunately, the rest of her race might not be so easy to convince.
MLP/Warhammer 40K crossover, part 2. Twilight is charged with driving the Iron Warriors from Equestria and their world. But the Tau aren't out of the fight yet.