This story is a sequel to Where Loyalties Lie: Honor Guard

After risking her own life in a daring adventure across the world to save Princess Luna, Rainbow Dash wants nothing more than for her life to return to normal. In her mind, what happened is in the past, and she wants nothing more to do with it. But a past abandoned is doomed to be repeated, and with an ancient threat rising beneath the snows, Rainbow may be the only mare who can truly save Equestria.

A Price of Loyalty story.
No longer canon to the 'PoL' universe; see author's note on chapter 1.

"Equestria's Guard: the Bravest and the Best. Do you have what it takes?"

So the advertisements say. When Rainbow Dash saves the life of Princess Luna, however, she quickly comes to learn that there's a lot more to the guard than what everypony knows. As she faces down threats to her friends, her Princesses, and her country, Rainbow will have to decide exactly who she is loyal to.

A Price of Loyalty story.

The sequel to Wayward Courier. Read that first, or you'll get lost.

Two months after his first visit to Equestria, Thomas has returned. And this time, he's not alone!
Now the ponies have to deal with not only him, but a depressed snarky ex-Scribe and a Brotherhood Ghoul with her own list of incredible achievements and emotional baggage.
However, things aren't well in Equestria, as they quickly find out...

All major details relating to Season 3 are non-canon to this fic.

After a mishap involving the Transportalponder, the Courier finds himself in a place he doesn't recognize. With no way back and nothing else to do, he decides that wandering into the nearest town is the best option. Being the Courier, things aren't that simple...

A Fallout: New Vegas/My Little Pony: Friendship is Magic crossover

The style alternates between omnipresent third-person and the Courier recounting his tale to... Well, take a guess.