If it's not obvious, AiE. And slightly less obvious, a Nightmare Moon and Anon story.

Anon Y. Mous is on his way to work bright and early. The same cycle that he repeats daily is interrupted by an open manhole that sends him down, yet not in the sewers as he knows.

With the round planet he calls home absolutely NOT under his feet, he finds himself stuck somewhere he thought only trained astronauts would be.

He is neither trained, nor an astronaut.
And lucky for him, the local ghost wants to pay a visit.

Comics lore don't apply here for good ol' Nightmare Moon. So uh, no Nightmare Forces.

Luna is not a weak pony, that's what she's been told by her sister.

Yet it's hard. Living with the shame and loneliness. Just like any wound, if left untreated, complications can arise, and like any disaster, sometimes the littlest things can trigger the greatest calamities.

Sometimes, our pain gets the best of us, and we lose our very selves.

Princess Celestia has dispatched her prized pupil, Twilight Sparkle, to oversee preparations for the Summer Sun Celebration. An unfortunate accident, however, cuts her student's life short. Now another must recover the Elements in her stead, or else Equus will be plunged into eternal night.

With so many of those "X becomes Y in Equestria" Fics bouncing around, I got an idea for one of my own that just wouldn't go away. Rather than let it distract me from my writing any longer, I decided to take the idea, put my personal twist on it, and get to writing! The story is already 100% finished, Epilogue and everything, so you don't have to wait long for updates like my other stories.

Huge thanks to The Spirits Demise for the wonderful cover art, and Azriel for editing and proofreading!!

I have a Discord server for my stories, y'all are free to drop in and check it out if you want.

Being trapped in stone is about as much fun as it sounds.

Unable to cause chaos or get revenge on those who trapped him, Discord takes the only responsible action.

Pbbbt, yeah right. It's Discord. "Responsible" picks itself up and throws itself right out the window when he's around.

He's getting cat's paws to do his work for him.

(A thousand thanks to Radiant Eclipse for the sweet cover art. Go check out his stuff, he's awesome. I'd also like to give a shout to everyone who's helped me with this story, and to the people who read it. I love you guys. Oh, and fair warning. This was my first foray into fanfiction, so it's pretty mediocre to start. Around the time Nightmare Moon makes her glorious entrance is around the time it stops being crap.)

Princess Luna's Lunar Stallions kidnap Twilight Sparkle when they see how lonely Luna is, and give her to the Princess as a gift. Nightmare Moon emerges from Princess Luna's psyche during the sleepover. The dark goddess would love nothing more than to have the beautiful mare all to herself, and the resulting chaos forces Celestia to call a psychologist to sort out Luna's multiple personalities.

A demon of a long-forgotten time, trapped in the barriers of an ancient prison; forever cursed with loneliness... until one day, she meets a human.

"What a queer looking creature..."

Heavily inspired by Juniper's Knot a visual novel by Dischan Media. Reading it is not required.

Thanks to DVAN56, bocaj518 and Mr101 for their help!

How many alicorns does it take to take care of a living nightmare that was torn away from its host, a changeling, a shadow of a tyrant, and the spirit of chaos?

Evvidently, two, as Celestia and Luna will find out. Now with three of their most hated enemies, plus one reformed one, how will they take care of them?

(REWRITE IN PROGRESS)

After a weekend spent in Canterlot, Twilight Sparkle arrives home to find an odd scroll in her saddlebags. In the following days Twilight is plagued by terrifying nightmares, and horrific visions from a life not her own. Can Twilight Sparkle resist the Nightmare, or will she fall prey to the darkness?

Scootaloo has always been a little bullied about her flightlessness, but recently it's gotten worse. Diamond Tiara and Silver Spoon tease her relentlessly, and even though Sweetie Bell and Applebloom help, the bullies' insults cut deep.
One day, while in the pit of despair, Scootaloo is offered the solution to her problem: wings. But what will this shadowy gift cost her?

In another timeline, created by the meddling of Starlight Glimmer, Nightmare Moon's plot to return and overthrow Princess Celestia has succeeded. Now Rarity is at her mercy, and finds that the lonely banished princess has taken a liking to her beauty and fighting spirit. Rarity must fight with every ounce of her mental prowess to retain her independence and her sanity.

Rated T for torture and suggestive dialogue