Throughout all of history, one concept has kept both the written and spoken word from becoming an unintelligible mess. That concept is that most holy of grounds known by some as "grammar." It sets down rules for language to follow, and keeps it free of distortion.

Yet something is wrong. The rules are failing. And only one pony so much as suspects that something is wrong. Something that goes deeper than a simple appearance of errors. Something that could be an attack on the very root of language itself.

In the aftermath of one of Pinkie's parties, an innocent query leads Dash to question why she's still living with Pinkie Pie. Why does she feel trapped when there's nothing holding her back?

And how many buildings can Pinkie Pie destroy before insurance companies stop covering 'acts of Pinkie Collateral Damage Pie'?

This story is an indirect sequel related to Where Earth Meets Sky, but can be read just fine on its own. It simply assumes a previously established relationship.

We all wear a mask called composure, beneath which hides a heart that twists with guilt and hidden feelings. Regal as she is, Princess Celestia is no exception. What might be revealed should circumstances cause this mask to slip - or break?

Set several years after the potential conclusion to the series.

Something is definitively up around here. Applejack and Fluttershy have been spending a lot of time together without the rest of the gang. Well, Rainbow Dash is on to them! In fact, she is sure this is the no-good friend-stealing Applejack's doing, and she will not stand for this - whatever this is.

Also, Rainbow Dash wears a corn hat.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

Twilight Sparkle may believe in Pinkie Pie's myriad abilities, but when an opportunity to study them from a perspective she never thought possible arises, how can she resist the chance at the understanding she's always truly wanted? More importantly, can Ponyville survive the trade-off necessary for this opportunity?

For almost a thousand years, the immortal Nightmare Moon has reigned over Equestria as Empress. To the average pony, Nightmare Moon is an overarching enigma whose rule is absolute and whose wrath is terrible. But to Twilight Sparkle, who as an orphan has never known her parents, the Empress is something else entirely. When the young unicorn is brought under the royal wing as an apprentice, she learns a great deal more about the supposed tyrant than she ever knew. But as Twilight is introduced to life with her new mentor, she is thrust into a world of political intrigue, conspiracies and secrets. Secrets that were never meant to be revealed. As allies and enemies plot against the very peace of the nation, will Twilight fall prey to the perils of her new position? Or will she prosper and find in Nightmare Moon the mother she never had?

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My eternal gratitude to my editor, LordOfTheWrongs, without whom Night's Favoured Child would not be the story it is today.

Now with added TVtropes!

Pinkie Pie and Fluttershy thought they were going to help banish Discord for a third time with their friends and the two princesses. That was precisely what was happening until they both found themselves suddenly transported to a strange new world under a flashing pink sky.

A man named Doug "TheSlorg" Collins finds two young women who are naked, confused, and smell of fudge in the Australian Outback. He then reluctantly agrees to help them return home. But when "home" turns out to be Ponyville, things become a bit more complicated than he bargained for.

Part of the PonyFall collaboration series.
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Temporary cover art by Speccysy

The Cutie Mark Crusaders ask Rainbow Dash and Fluttershy about what happened just after the events of the Cutie Mark Chronicles; specifically, what happened to Fluttershy and Rainbow Dash immediately after the race. Reluctantly, Dash and Fluttershy delve into a tale. A tale of a young Fluttershy's amazement at the world she had landed upon, and a filly Dash's desperate quest to save her from that most evil of places: THE GROUND.

Rainbow Dash usually had her head in the clouds, but she always thought she knew up from down. When an incredible revelation sends her life into a tailspin, she finds herself at the mercy of emotions she never thought she had, faced with hard questions and impossible choices.

Life is full of changes, but none of them are quite as disturbing as having a horn pop out of your skull…

Original Lauren Faust canon; non-alicorn Twilight, non-alicorn Cadance, no ascension. Diverges from the cartoon after season 3, with nods to later continuity wherever possible. Contains mature themes.