Twilight and her five friends are transported during a botched spell, across dimensions to... Ponyville, Equestria? But not the same one that they knew. Sitting on a bench is Harpsy and Babar. The Doctoress avoids apples from an aspiring Applebuck. And in a library across town, six stallions join their forces as they try to decipher the appearance of filly look-alikes of themselves around Ponyville!

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

==Originally written spring 2011== Equestria Daily Post==
GLaDOS is free of Chell, free to continue testing, when she discovers a portal gun Wheatley tried to repair with duct tape. When the portal gun catastrophically fails, the enrichment center, GLaDOS, and Chell are literally dropped in the middle of Equestria. The mute test subject soon finds the world of ponies far more welcoming than the human world. But GLaDOS sees possibilities. Let the testing begin... for science.

==Originally written Fall 2011== Equestria Daily Post==
After a long day of ruling Equestria, the Royal Sisters need a chance to unwind. Luna's solution is a few glasses of her once famous Moonshine, a drink distilled from moonlight. Celestia has been sober for a thousand years, but the temptation to have "just one" glass proves too great. Yet, when that one glass turns into several, it's Twilight who will have to deal with the princesses when they’re drunk off their flanks.

This story is a sequel to Drop of Moonshine

Sequel to Drop of Moonshine -

Applejack receives an order from Princess Celestia, for a batch of cider prepared with a very special recipe that involves honey, yeast, and time. She's even invited to taste the special cider when it's ready. But, when Rainbow Dash finds out about the special tasting, the three mares soon have a little too much to drink. What shenanigans will unfold and how will Twilight keep a lid on things this time?

To save her sister and her faithful student, Celestia herself must travel into the ancient tunnels beneath the ruined castle in the Everfree Forest. She, and the guards who accompany her, must face the dark, twisting corridors. Still, what was Luna and Twilight's purpose at the old castle? Why were they unable to return of their own accord?

And what watches Celestia from beyond the light's edge?

link to dramatis personae

There was nothing left for Spitfire in Cloudsdale, just an uncle who hated her and painful memories of lost loved ones. The Pegasus Search and Rescue Corps offers her a chance to get out of town, see the world, do some good - and one day maybe have a shot at the Guards or the Wonderbolts! She jumps at the opportunity - and six days later, she limps into training camp.

Doesn't matter: she made it. The world can beat her down, but it can't keep her down. The friendships she forms here will get her through everything training has to offer. Will they also see her through the dark clouds on the horizon?

(Rated Teen for violence, language, some suggestive themes)

This story is a sequel to Dusk and Dawn

The Dawn Militia and Nightmare Moon's armies continue to wage war across Equestria under the eternal night. The six bearers of the Elements of Harmony–Fluttershy, Rainbow Dash, Applejack, Rarity, Pinkie Pie, and Trixie–have been blessed with extraordinary powers, with which they lead the Dawn against the tyrant and her reluctant lieutenant, Eclipse.

But it's hardly easy. After all, what place does harmony have on the battlefield?

Set in the far future after Celestia and Luna mysteriously vanished and the sun and moon froze in the sky, Antipodes is the story of two ponies thrust out into the harsh new world on an adventure to uncover what happened to the world so long ago.

(I wrote this when I was 17. it's pretty rough in places, but i think the basic ideas i had here were pretty cool. it's got a good skeleton)

Spanish translation here: https://www.deviantart.com/spaniard-kiwi/art/Antipodas-1-3-953524835

The storm is breaking on the Horizon.

It's been two months since the battle against Nightmare Moon. Luna is recovering, Celestia is busy turning the government back into a diarchy, and the Mane Six have returned to their lives. All seems well, but when Celestia discovers that half of the power of the Elements of Harmony have been transferred to each of the Bearers, she decides to send thirteen mysterious members of the Royal Guard to monitor them as they manifest and develop their new abilities.

The sins of a forgotten war still linger, and an ancient evil lurks in the shadows, just waiting for the right time to strike. The Mane Six suddenly find themselves once again at the heart of a conspiracy to bring about Eternal Night, and only by awakening their powers and realizing their full potential can they do anything to stop it. Friends both old and new will help them along the way, and an unseen force will guide them as it seeks to right a wrong made thousands of years ago. The Bearer's journeys will take them outside the borders of Equestria and into the world beyond, and when they return, they'll have the power and experience necessary to save the world and bring about balance in all things.

The Powers of Harmony TV Tropes Page (SPOILERS)
The Powers of Harmony Art

Thanks to Wildy71090 for the cover pic.