Disclaimer: This story is a rewrite of another story called "The Big One", which I started a couple years ago and never finished.
Everything in Canterlot has finally calmed down when it comes to magic, and the girls have learned how to use their powers properly. However, all the crazy stuff that's happened has drawn many dangerous people to the little band, and the Rainbooms might not be able to handle them all.
Luckily, the two groups that don't want to hurt them also happen to be the two most dangerous groups.
GTA 5/Online crossover, and maybe another game, too
And yes, I know that GTA Online is pretty much garbage now.