Stumped on the mystery of the locked box, Twilight begins to get frustrated. When Princess Celestia suggests to Twilight to visit her old castle, she jumps at the opportunity to make any type of progress. Little did she know she would get a lot more than she bargained for...

Basically this story is a mix between Castle Mane-ia and Bats!, but with a dark and interesting twist. Join Twilight and her friends as they brave the thousand-year-old castle and unearth its ancient mysteries while escaping a sinister, unknown threat. Will the ponies be able to escape the clutches of darkness? Or will they be morphed into a shadow of their former selves?

Original story idea by DarknessRising

When Rainbow Dash wakes up to find herself sharing a bed with somepony—or rather, somedragon—she knows she's going to have an eventful day. Determined to put the whole ordeal behind her, she agrees with Spike to forget the evening had ever happened.

However, things have a way of coming back to haunt you, and for Rainbow Dash, it may not be what she asked for at all.

Group collaboration between the lovely members of SpikeDash:

Yours truly,
Vexy,
FierceRainbow,
Rainbow87dash,
Garbo.

January 15th, 2014. A veil of light spans across the United States of America. As the citizens stare in amazement at what is certainly a once in a lifetime phenomenon, the entire country is ripped physically out of its place on Earth and sent to a new world, a world known as Equus. Now with 312 million Humans and their country trapped in completely unknown territory with no way home, they must do what Humanity has done for centuries that has allowed it to become a force of nature. Adapt, Survive, and Overcome.

Editor/Adviser: Sneaky Breeze.
Editors: Washingtonian & AlphaFartOfDoom
Technical Adviser: ArtichokeLust
A big thanks to them for all the input and help they have given.

A sudden and powerful magical event consumes all of Ponyville in the space of a few moments, and when Twilight and her friends come to, they find the landscape around them quite different. And the world they discover, to be devoid of magic and inhabited by strange beings.

One of these beings is Asher Burgess, the oldest son of the family whose secluded, Colorado ranch has suddenly become the location of an entire town of alien creatures overnight. Their lives are changed forever as they find themselves the link between the ponies and their own nation.

Bewildered by this new world, things start getting more urgent as more of the Equestrian world arrives piece by piece, and not all of it is so friendly. Searching for answers, Asher, Twilight, and the rest of the gang stumble onto more questions, and uncover an amazing secret. One that could either save them all, or doom both worlds to annihilation.

(Set just after the events of season 3 finale. Diverges from there, movie has no effect.)

Graciously edited by Dream Seeker, Commander Fire Starter, Sharp Quill and Absurd Tomfoolery

P.S. A request if you will: When someone gives a "dislike," would ya'll mind commenting why? Especially if it has something to do with a writing skill.

This story is a sequel to Celestia's Tiny Student

(Title changed from "Ponyville's Tiny Librarian" for reason pointed in this blog )

Twilight Sparkle is a one-kilogram pony the size of a large rat, shrunken by Princess Celestia following her entrance exam to the Celestia’s School for Gifted Unicorns to ensure that her power surges would not pose a danger to the ponies around her.

She’s spent thirteen years full of hard training at her new size, facing the life-threatening experiences that came with living in a world of giants. To survive those thirteen years of hardship and joy, of learning and adventure, and of pride and humility, Twilight has challenged herself to be stronger, to overcome any obstacle.

Now that tiny Twilight is on her way to Ponyville to oversee the preparations for the Summer Sun Celebration, how well will this miniature mare fare outside of the confines of the castle? How will the other Element Bearers react to her? How will Nightmare Moon react to the tiny unicorn? Is Twiny prepared to face Ponyville, and, more importantly, is Ponyville prepared to face her?

Credits:
Art cover - kc day

Top editors: (editing and rewritting for months, hope quality is to your liking).
Kydois
Georg

Nightmare Moon's sentences editor:
Bahatumay

Applejack accent editor:
Crimson Star (Chapter 1 - Applejack)
Rebel Brony
The Notebook is grounded

Pinkie sentence's editor:
Plump it UP

Other editors:
Hereward
tana1100
Lab (small editing from prologue to chapter 4)

Pre-reader:
Rated Ponystar

To celebrate the release of this sequel, I created a group called “Twinyverse” for all fans of this story where you can talk about it and track all side stories with ease.
The Twinyverse Group

A sleeping Rarity mysteriously appears in her friends' beds, and nopony knows how or why. Her friends are determined to discover the truth behind Rarity's night-time snuggling spree.

It's been two and a half years since Twilight Sparkle returned from the other world, leaving Sunset Shimmer in the company of the alternate group of friends she made. However, not all has gone well for her one-time rival in the other world. On the night of the 30th moon, Sunset emerges from the mirror and uses an ancient relic to switch their bodies. Alone in the care of Sunset's overbearing ex-tutor, Twilight uncovers the forgotten past that drove her rival to such desperation, while back in Ponyville, Sunset struggles with Twilight's lifestyle clashing with her own dreams.

Proofreaders: RTStephens, Winter Solstice, The Albinocorn, Dartrunner and NightWolf289.
Cover art: FallingRain22

Featured by Twilight's Library September 2014.
Featured on Equestria Daily

What if instead of a chest, The tree of harmony gave Twilight a book with strange writing and a heart shaped gem on the cover. After reading a mysterious rhyme: "When the time is right. Underneath the same light. A bond will ignite. At very first sight." The Mane Six, and Spike, are all magically sucked in and they travel to a world with no ponies or magic, but humans and...bending! People who can control the four elements of nature. With no way to get back home, they stumble upon a new friend: Avatar Korra, a fiery but big hearted young girl with an extraordinary destiny. Upon first glance, the Ponies all feel an instant connection with the young girl, who might also be the key to them returning to Equestria and uncovering the secrets of the book, while at the same time help Korra to defeat an evil masked man named Amon who vows to rid the world of bending with his mysterious and terrifying powers.

Now the ponies will need to adjust to their new environment: a whole new world where people seem to loose sight of friendship almost too easily, but Twilight sees that there is hope, as they show Korra the ways of Equestria and with that, the ponies and avatar start to change their world for the better, by helping everyone see that Friendship is exactly the kind of magic that this world truly needs.

Featuring new parody songs of all of your pony favorites. Experience a whole new side to the Legend and a whole new side to the Magic!

Read the one shot story “Cutie Troubles” staring Mako and the Cutie Mark Crusaders, and “Tales of Equestria”, a retelling of season 4 of MLP
https://www.fanfiction.net/s/10264379/1/Cutie-Troubles
https://www.fanfiction.net/s/11140115/1/The-Little-Pony-Legend-Tales-of-Equestria

This story is a sequel to Stardust

Times are changing for Equestria as Twilight’s return brings with it news of people and cultures from beyond the peaceful world everypony knows. Aid and volunteers are freely offered to help the besieged humans of Earth because every Equestrian knows that’s what good friends do. Unfortunately, making friends can also have the unintended consequence of making enemies.

When the monsters besieging the humans strike at Equestria with a level of brutality not seen in over a thousand years, the cry for help is sent to all the kingdoms of the world. Honored allies step forth to fulfill ancient treaties and oaths. Enemies, old and new, bury their grievances. An alliance never before seen in Equestria will be created to combat the monsters from the void.

And because of these events, a grim but welcome sibling to the XCOM project is born.

(XCOM/FiM Crossover)
(Sequel to Stardust, which I recommend reading before starting this. Fortitude Amicitia and Broken aren't required reading but are supplemental to the storyline)
(Gore tag for blood and violence)
(Alternate Universe tag because of the divergence from canon that Stardust has caused)
(Uses elements of Season 4)
(Coverart produced by the amazing Carnelian!)
(Many thanks to Arzoo, BradTheBrony, Vandenbz and Setokaiva for prereading!)
(As of 03/07/2016, the prereading team consists of Arzoo, BradTheBrony, Noble Cause and Metallusionsismagic!)
(Complete with it's own TVTropes page as part of the Stardust continuity. Could use some updating!)
(Character tags will be added as chapters are added!)
(Featured 5/12/2014! Thanks folks!)
(Possible spoilers in the comments! BEWARE!)

Discord is up to his old tricks again...But he's noticed something. Something that he can't explain: Love.

And once finding out about it, he comes to the logical conclusion that he needs it...And unfortunately for Ponyville's local farm-mare, he's set his sights on her.

With Cadance's help, will he succeed? Or will Applejack buck him all the way to Tartarus?
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And now with a TV Tropes page.
Please feel free to contribute.