Luna discovers something hidden from Celestia for twenty years, now, with emotions running high, she enlists the help of the Mane 6... but what seemed to be a single mystery, soon reveals a darker and much more complicated plot that will soon decide the fate of Equestria.

Check out the Empty Room TV Tropes Page (Warning: Spoilers!)

Revised chapters edits and proofing (with many thanks) by: lammy, Trevor, Nick Nack, Fifth Alicorn

Celestia is trapped on Earth.
Not as a human. Not as an alicorn. She's a common horse, an Arabian mare, without her magic, voice, knowledge of the language - not even freedom, forced to work at a riding school.

What can a single Arabian mare do to get back to Equestria from this backwater European country? With only the mind of a princess and a pencil in her teeth, Celestia must find a way home.

[Illustrated] [Alternate Earth] (without Bronies)
Rated Teen for language and some scarce suggestive themes.
Proofreading by AlicornPriest

Polish language version

The royal court of Canterlot welcomes its newest member with open forelegs: the human philosopher Voltaire, from Earth.

On Earth, Voltaire is known as the greatest enemy of tyranny in the history of literature, and a legend in his own mind.

On Equestria, the court betting pool is giving him a week before the Princess banishes him to the Moon.

Note: This story doesn't have sequels per se, but there are a couple of short follow-ups set in the present day ("Parade Coverage" and "Secret Histories"), and a prequel of sorts in "At the Inn of the Prancing Pony".

TV Tropes page.

The Chaos Rose is a unique flower that only blooms once a year on Hearts and Hooves Day. It is a symbol of unyielding love and affection between ponies and is sought after as one of the greatest and most treasured gifts of the holiday.

So, what will happen when Twilight Sparkle buys one and gives it to Rainbow Dash?

And, more importantly, what will Rainbow do when everypony becomes convinced that Twilight must be in love with her because of it?

Prereading/Editing by: Carabutt, Auramane, and Zaphod.

Cover art by Rossby Waves.

Diablo Crossover.

The Archangel of Justice destroyed the Worldstone to spare Humanity the corruption Baal infected it with. The force of its death knell shatters Mount Arreat and sends Tyrael hurtling across the endless planes of reality. He falls upon a world untouched by Angel or Demon, far from the sight of the High Heavens. So far, in fact, that he fears he will not be reborn from the Crystal Arch.

Wounded and near death, hope appears in the form of two strange creatures bearing the power of night and day.

Tyrael now faces a time of recovery as his power slowly heals within a body fashioned for him by his saviours. Justice Incarnate tastes for the first time the life of a mortal, and it is a strange, confusing experience .He has been left in the care of one Twilight Sparkle to learn of this world.

After all, where better to find peace and harmony than Ponyville?

Act I - The Root of Evil
Act II - ????????
Act III - ???????
Act IV - ???????

[Cover image used with full permission of the owner. Go on, go have a look at Chagial's stuff.]

Set just before the events of chapter ten of Friendship is Optimal. One of the last living humans survives and scrapes by in the ruins of Eugene Oregon. He is approached by a simulacra of Twilight Sparkle, who promptly attempts to convince him to upload himself to Equestria. He balks at first, so Twilight plays to her strengths: studying.

Part of the Optimalverse.

WARNING: RATED TEEN FOR IDEOLOGY. This story attempts to take a realistic and balanced view of why an intelligent and religious person might not upload. It does not attempt to convince the reader to believe any of the viewpoints discussed. However, it is written in as unbiased a way as possible, therefore, both theists and atheists will probably find portions of it offensive.

Shining Armor is a tooth. Really. Princess Luna says so.

With a reading that had once been done by Scarlett Blade, only now missing (darn).

And a review by Present Perfect.

Rarity receives an invitation to Equestria’s most exclusive and secretive social club. The only catch is, she can only attend if she brings her lawfully wedded spouse. Fortunately, there’s a certain purple dragon who’s willing to help her overcome this little difficulty. It’s a simple, foolproof plan: get married, attend the club, and then get an annulment. Nothing is ever that simple, however… not their weekend, not their friendship, and certainly not their marriage.

Edited by Level Dasher

Featured on Equestria Daily!

Audio reading by Brook the Book Horse

This story is a sequel to The Chaotic Touch of Harmony

It has been nearly a year since ponies and Mions appeared on Earth with humanity being divided in how to deal with both. While the ponies in the newly formed town of Trinity work to establish themselves, the rest are scattered throughout the planet while trying to find their place in the world and the Cult of the Koridost is quietly ramping up their genocidal campaign against humanity.

Will Discord’s vision of humanity’s ruin come to pass? Or will his less than direct intervention allow the planet to see a brighter tomorrow?

It is highly recommended to read the first arc because this is a direct sequel and many plot elements may be confusing without previously established context.

Again, thanks go out to Quite Quiet for his editing work.

Excellent cover art by Tulip

"It has been the pivotal teaching of the great Fountainhead, personal mentor and Celestia's most esteemed archivist, that the grand unified theory of magic, if discovered, is to be found within the mage's affectivity –that is; of the polarizing impetus of love, for unicorn magic, and hate, for Black Magic. It is claimed, further, that reality itself, too, is subject to this principle; and to deny so was self-contradictory. The dogma, however was not uncontested. Unicorns, Mages and Archmages from all over Equestria of all emotional preconditions would challenge and confute the thesis with ease. It was here that the great Fountainhead replied that the grand unified principle was too profound to be felt and too minute to be perceivable. He posits that, though invisible, this maxim holds together the fabric of the universe: matter with magic; existence with consciousness; dreams with reality; and–most significant of all–ourselves with one another."

-Starswirl the Bearded, "Hermeneutical Phenomenology of Pre-Classical Metaphysics", Royal Canterlot Archives (323 L.B.), p. iii-iv

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EDIT 04/16/13: Remastered version coming soon! Grammatically sound, split into several chapters and improvised.