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

This story is a sequel to The Life and Times of a Winning Pony

Cloud Kicker's life has been going just about perfectly. She's got a good job, two beautiful girlfriends, and she's never been on better terms with her friends. She's even getting more time with her family now that her cousin is serving as Princess Twilight Sparkle's personal bodyguard. She made mistakes in her past, but now all of that is over and she's earned her happily ever after.

Or at least, that was what she thought. Little does she know that her new life is about to start getting very complicated.

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!)

This story is a sequel to The Best Night Ever

Final Arc - The Black Wedding
CH63 - If I Had a Heart
- The ponies of the Fourth Tribe are ascendant. Shining Armor hunts down his changeling "daughters," and even Lady Antimony won't get in his way. Meanwhile, high above the burning city of Canterlot, a long awaited reunion occurs, and Twilight confronts Alpha Brass and makes a final decision.

--- --- ---

It began with a mare from Ponyville and a time-looping Prince from Canterlot. This most unlikely union now stands at a crossroads: a ruthless changeling invasion; a conspiracy within the highest circles of the Equestrian aristocracy; a half dozen power hungry noblemares looking to become a Princess in all but name. With the prize of Canterlot and its Platinum Crown at stake, it falls to six Elements of Harmony to once again save not just Ponyville, but all of Equestria.

---
---
TVtropes page is here: link

The prequel to TPC, "The Best Night Ever" is here. link
The side-story crossover with "Sweetie Belle Chronicles" is here. link

Someone out there made a playlist for Platinum Crown: Rarity, Blueblood and Chrysalis. Pretty sweet!
Wish I knew who, or even when they did it, though. I especially like the Chrysy playlist.
https://8tracks.com/explore/this_platinum_crown/hot/1

I've gotten some cool TPC related art done, too.
So Sweet and Tasty's TPC Cover Art
link
Thanks to Madmax for these two:
Rarity, Blueblood and Antimony
link
Dash and Ritterkreuz
link
The Terre Rare Founder - Lady Arsenic
link
Twilight and Alpha Brass Battle Duet
link

This story is a sequel to You Can Fight Fate

Time loops? The end of existence as we know it? Fate itself conspiring against you? Who has the energy to deal with that kind of thing?

Not Cloud Kicker, that's for sure. She's a mare who knows what she wants out of life. An easy job, a nice house, and an endless supply of potential banging partners. Then one day a simple little flower vendor moves in down the street and everything starts to change.

As a side story to the main Time Loop Trilogy, you can expect massive spoilers in the comments for both the original stories and unwritten chapters of this one.

This story is a sequel to Long Road to Friendship

It is a new year for Sunset Shimmer; a fresh chance at real happiness with her five best friends and her girlfriend. But Sunset is constantly troubled by her uncertain future, and haunted by the consequences of her past.

For her battle against Princess Twilight has drawn forth ancient forces with eyes on the last bastion of magic: Canterlot City.

As darkness closes in, Sunset must find her light and guide her friends to defend their world against old rivals and legends best left forgotten, all while dealing with their ever-looming futures.

But when graduation comes, what will Sunset Shimmer do? For she is still a stranger in this world, with or without her friends, and the road before her guarantees nothing.

Of course, with the universe conspiring against her, it'll be a miracle if she even makes it that far...

Story plot edited by HenryAnthonyCourtler
Pre-read by DrakeyC
Wonderful cover art designed by HanasakiYunarin!
Text added by Amber Spark!
The page of Spectacular Tropes!
Presenting the French translation!

A drop-out mage that meddles in things forbidden should take care not to be caught, and if one is, the last thing you'd want to get caught by is a trickster god with a sense of humor.
Add a unicorn lost in limbo in need of help getting back home, and the beginning of a journey fraught with danger, mystery and trickery is set. A journey to find the way to the ultimate goal he's been chasing for years, but which can only be found if he learns the answer to the question of what it means to be a trickster.

Fluttershy knows it is her honor, her destiny, to have been born into the Lunar Guard. She knows it with all her heart. But sometimes, when she can get away from her drills and be alone with her animals, she is beset by doubt. Sometimes, as she straps on her armor and raises her spear, she wonders why there is so much disharmony in the world.

Sometimes she feels like Equestria is missing a little kindness.

Equestria Daily

Thanks to Rex Ivan, docontra, Reese, and JackRipper for helping to make it readable.
Cover art done by Conicer.

When Twilight Sparkle slipped beneath the covers last night, everything had been fine. She had friends whom she loved, a teacher she adored, and a bright future ahead of her. But when she woke up, her blankets and quilts had been replaced by hospital gowns and padded restraints.

Everything is wrong and nothing makes sense; even her friends have changed. The doctors keep telling her that she is sick, that none of it was real and that it was all in her head. Yet she remembers a life far beyond the hospital walls. She couldn't have made it all up on her own. They must be lying… right?

Ask Asylum Twilight - Still updating regularly!
Equestria Daily
TVTropes
Asylum Fan Group
The Tartarus Project
Russian Translation
The Asylum 20,000 View Spectacular Stage Show!

Art:
Asylum Cover by conicer
Twilight and Twilight Smiles by dreamingnoctis
Mirror Twilight and Plague Doctor by Jaestring / BloodGoldWings
Twilight Smiles and Doctor AJ by conicer
Nurse Ratchet and Silas and What's in the mirror? by Archonix
Doctor AJ Sketch by Archonix | Colored and vectored version by ReFro82
Twilight's Asylum by Khan the Cake Lover
Smilight by HappySwitch
Twilight Waking Up by Dombrus
Fan Art by toxicdemon10
Asylum Twilight by Madness-With-Reason
Asylum Fluttershy and Asylum Ch 26 by Downburst-Backspace
Twilight and her Twin by v747
Birdgirl by sirValter

Readings and Videos:
Asylum Animated Trailer Video by formuladash
Reading by Gammarobot (SugarCubeRadio): All Chapters Here
Reading by Ender Brony: All Chapters Here
Reading by VisualPony: All Chapters Here
Reading by MelancholyIguana: All Chapters Here
Fan Trailer by Kaidan: Asylum FanFic Trailer Cuckoo's Nest

Sanctuary by Kaidan
Broadhoof Files: Dr. Humors by TypewriterError
Broadhoof Files: Corporal Phalanx Spear (Ret.) by Phalanx Spear
A Hearth's Warming Tragedy by Seven Fates

A special thanks to Breath of Plagues, Rex Ivan,
ChudoJogurt, Cynewulf, Death the Kid, Selbi, PrinceDolph, Blahman2816, Queue, and Gage!

Axan Zenith - Dr. Dreamer
Dratini4 - Way Finder
psychicscubadiver - Bright Mind
Velkaden - Dream Chaser
Reese - Silver Glow
Viola Heartstrings - Clover
Archonix - Spinney Whiteacre