As an Earth Pony ruin explorer, keen for riches and looking after yourself, you come across an old, ruined castle in the Everfree Forest. But instead of treasure, you find something much more dangerous, and much more wonderful. (Set mere hours after Nightmare Moon's defeat)

Sequel: Left Behind: Sunny Disposition
Apparently it was scouted and is on EqD too
Review by DarkSymphony on youtube.

Nightmare Moon was meant to be released after a thousand years. A momentous occasion for her but terrifying for all the ponies on her day of freedom. She would get revenge on her sister and cover the world in darkness and shape everything to fit it.

That was the plan, at least. Instead, something went awry with the spell and she wasn't released when she was supposed to be. The mare-in-the-moon is brought into a world with stagnated technology, giant cities, and no sign of her sister or any of the other immortals. In fact, ponies don't seem terrified of her at all, and the stay within the core of her powers infused and changed the alicorn's body drastically.

The alicorn had no obstacles left! But...she was also a relic of the past. A past everyone seemed to have forgotten. A past she could no longer look upon.

Artwork by ElkaArt. Link in source.
Big thanks to Kryostase for helping spot errors I've missed.

Staring at the sun makes you go blind.

During her entrance exam, Twilight's powers goes far out of control, leaving Celestia a shell of herself and Equestria in ruins. Now Nightmare Moon is free, but even she can't stop the Tyrant Filly. She flees through time and space, finding herself in an Equestria familiar to us but odd to her. Can the Mane Six help her stop a Twilight out of control?

Fanfiction.net link here!
Weekly featured fic in Authors Helping Authors group

TV Tropes Page, with sincere thanks to DrTempo.

Cover art from here.

After failing to stop Nightmare Moon in the ancient castle of the pony sisters, Twilight Sparkle is left with a scar that will permanently change the rest of her natural born life. As Twilight recovers from her ordeal, she finds that she is left with a difficult choice. Either live her life as a lie or sacrifice her innocence to protect the ones she loves. The path before her is set and she must now walk it alone. The sands of time continues ever onward, with everyone already trapped in its muddy depths. The sun will rise and the sun will fall. Waiting for its call, Death awaits for all.

Tags, rating, and characters can change.

Art created by:
http://cuteskitty.deviantart.com (top)
http://ventious.deviantart.com (bottom)

I just put the two together

As the thousandth Summer Sun Celebration approaches, Celestia dares to dream that Luna will be willing to start over.

Companion piece to Luna Loved.

Nightmare Moon/Luna has been banished to the moon by her sister Celestia. However unknown to Celestia herself, Nightmare Moon/Luna had some extra baggage with her at the time....

Based off a picture post I saw floating around a site. I decided to write for 60 minutes to see what I could make. Here's the primary result.

Ah, sunrise.  The perfect time for a cup of tea!

Calming, delicate, and sweet!  Just what Daybreaker wants in the morning.

Yes, tea truly is the best. . .

It’s simply unfortunate that her day is about to be ruined by Monster Energy.

UPDATE (10/05/24): Grammar and Spelling Revision, courtesy of TheSmokingGuy!

Now translated into Chinese thanks to AnQIRanA!

Featured on Equestria Daily on October 8, 2024!?

An experiment in FiM reinterpretation.
Featured: 1/19/2015.
-----

MANE: Maneuver, Assess, Neutralize, Execute.

They are the world’s special forces operators, the best of the best no one sees. Employed by the covert organization known as the Network, MANE teams operate around the world to protect the Network's global interests. Despite their unique personalities, these motley squads of citizens, soldiers, and criminals have completed countless missions together. But in a period of an imperfect peace, many unit had been deactivated. MANE operators went back to their homes in the hopes of rebuilding their lives in harmony. That is about to change.

Twilight, a student of the Network, has received the first assignment of her academic career. As Cell’s personal protégé, she has been tasked with overseeing preparations for a historic diplomatic meeting. But after her mission takes an unexpected turn, an unforeseen evil threatens to destroy the Network and plunge the world into eternal darkness. Against uncertain odds, Twilight must unite MANE VI and fight to restore Harmony, while realizing her place in the world along the way.

Contains humanized, militarized FiM characters in an alternate universe, set on a near-future Earth.
Rated Teen for: scenes of combat, violence, swearing.

Featured Box: 1/19/2015
TV Tropes Recommendation: http://tvtropes.org/pmwiki/pmwiki.php/FanficRecs/MyLittlePonyFriendshipIsMagicGeneral

Nightmare Moon always had a backup plan if she ever were defeated; she would slowly regenerate herself and regain her power. The problem is she never expected to come back as a defenseless filly, or to return directly in front of the princesses. As punishment for her past crimes, Luna has given her a sentence far worse than being sent to the moon again. Nightmare Moon must move in with Twilight and report to Luna on the magic of friendship. She's not very happy about it.

By the way I am not trying to rip off Past Sins in any way. Nyx is NOT in this story, this will go in a completely different direction.