This story is a sequel to Upheaval: Breaking Point

Following the events of Breaking Point, Twilight Sparkle and her friends discover that Equestria's demise may not come from an enemy invasion, but from within. The Barrier Lands and the Heartland begin the slow and uneasy process of reuniting into a single Equestria, but this long-delayed joining is already in danger at its conception.

With Celestia's power in her grasp and her agents by her side, the wheels of Black Rose's plans for Equestria's future continue to turn. However, her brazen gamble has done more than just bring down a centuries-old barrier. Ancient powers begin to stir: the remnants of a dark period in Equestria's history, the immortal inhabitants of Celestia's homeworld, and a rising tide of darkness coming ever closer.

A classic tale. Twilight tries magic. Magic doesn't work. Magic ends up reaching across the dimensional boundaries of time and space to bring forth the League of Legends's most dreaded incarnation of fear on four hooves to peaceful little Ponyville. Simple stuff, really.

A delightful little story in which the Shadow of War learns that friendship is the most powerful magic of all.
... Or was it suffering? Maybe it was suffering.

After her life was turned upside-down by Deathwing burning down Ponyville and Equestria getting flooded with adventurers from all of Azeroth, Carrot Top struggles to save her farm from bankrupcy. Opportunities for extra money are everywhere, but the world now plays by new rules. Can she learn them quickly enough? Or is there a different solution altogether waiting for her?

A tie-in story to Capn-Chryssalid's World of Ponycraft
Crossover with World of Warcraft, obviously.
Picture by ~ymmot392, used with permission

Inspired by the heroics of the mysterious mare known as the Stable Dweller, Silver Storm, a guard of the town of Marefort, decides to go on a daring mission to rescue her captured brother. Of course things rarely go as planned and her attempts at heroism drags her into a tangled web of plots and conspiracies as warring factions vie for control over the last great city: Dise.

Spanish Version translated by Spaniard-Kiwi: https://www.deviantart.com/spaniard-kiwi/art/Fallout-Ecuestria-Heroes-996263393

CANCELLED

After her disappearance three months prior, Rarity finds her way back home. Of course, this raises several important questions. Where was she? What did she do? Why is she wearing bloodstained armour? And who is this "Wanderer" she traveled with?

This story is a sequel to Rainbow Factory

Cloudsdale Weather Corporation has been running without incident for over twenty years. That is, until two foals manage to avoid being processed and find themselves in the haunted bowels of the massive facility. Can they make it out of the abandoned factory with their sanity intact? Will they uncover the secrets even a company as dark as the CWC is ashamed to keep? And what of the workers who help ensure that, in the end, not a single soul gets through...

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—[TVTropes Article]—[Plagen Shiki's Reading]—[The Song Inspired by the Story]—

An undead Emperor in need of a new body. A Spartan lost in space. A ragtag team on a suicide mission. What do they all have in common? They all wind up on the magical world of Equestria, where war has been forgotten. That, however, is soon about to change.
When each of them is about to be retrieved, ancient evils arise to unleash hell upon the unsuspecting world. When the forces of three galaxies clash around them, can our favorite ponies hold out against the onslaught?
This is a crossover involving Warhammer 40k, Halo, Mass Effect and MLP, and is also my first fanfic. Comments and reviews are welcome.
Rated T for language, violence, and general adult situations.
Now on Tv Tropes!

Princess Celestia: Goddess of the Sun, ruler of Equestria, beloved Princess of ponies. She is loved by all, and loves all in return. A calm and wise ruler, she sits on the throne in Canterlot, maintaining peace and harmony throughout the land.

What most don't know is that her past is much darker: She was once a commander of legions, a warrior and scientist of unmatched skill. Thousands of monsters and abominations fell to her forces, slain in the name of an old leader, one entombed within his own throne. Free of her old form, free of the powers of Chaos, she was cast into a new realm, in a new form, with a new lease on life.

She is the God Emperor, Eternal Ruler of Equestria and Lord of the Imperium of Man.

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Comments contain spoilers. YOU HAVE BEEN WARNED!!!

The Piano Man has spent the last month in captivity, forced to play the piano as part of The Great and Powerful Trixie's traveling show. Now he's free, and recovering under the care of the Equestrian monarchy while Trixie awaits trial for her crimes.
All is not well, however. The Piano Man has a long road of recovery ahead, and all the time he must compete with overbearing carers, his own mental trauma, and even discrimination from members of Equestria's unicorn supremacist subculture.

This story is the kinda (can't stress that part enough) better-written sequel to 'The Piano Man'. Because the first story involved some rather dark scenes, I have included a helpful catch-up in the first chapter - so if you have no interest in reading a dark story, then you can ignore the first piece and skip straight ahead to this one.
'The Piano Man: Act II' is most certainly not a dark story, and neither is it sad. The sad tag is in place for scenes in which I reference the previous installment, and nothing else.

The absolutely amazing cover image was created by the even more amazing WIL_I_ZIN, (deviantART) who is just... just awesome, for helping out.

Twilight Sparkle has always admired Princess Celestia. Her fortitude, her wisdom, her eternal grace and love for all her subjects. Twilight has often fantasized about what it would be like to be in Princess Celestia's horseshoes. She never imagined those fantasies would come true.

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Events take place a short time after the Crystal Empire's return (early S3).
Proofreading from chapter three-onward provided by Daemon of Decay.
Cover image used with permission from TexasUberAlles, thanks!
Inspiration for Sunny Skies from PhantomFox.