Princess Twilight Sparkle has recently been hearing a strange voice in her head. She's been taking some time off to try and study it, but she can't, as strange accidents and events start to happen in Ponyville. Ponies are becoming disoriented and unable to fly, and some start getting mysterious injuries out of nowhere.

Twilight needs to find answers fast, before every single one of them is broken.

Inspired by the season 5 finale

The rainboom never happened. The mane six were never friends. Now, Nightmare Moon rules all of Equestria with her sister trapped in the moon.
Violet Tempera is a royal painter in the castle of Nightmares, and is facing the Mare in the Moon every day, but she still remembers the beloved princess of the sun. After so many years of night, she needs to find a way to bring Celestia back.

She recalls a legend of six magical stones to guide her on her journey.

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This is a case of writing for the sake of writing, so things aren't solidly mapped out. Thanks to JustAnotherRandomPony for editing. You're welcome to point out tpyos in the comments!

Picture by GenjiLim, modified by me