Sequel: Left Behind: Sunny Disposition
Apparently it was scouted and is on EqD too

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.

Instead of being forgiven for her crimes against the Equestrian Princess, Twilight Sparkle, Sunset Shimmer is sentenced to a lifetime in Tartarus. But when trouble rises in Equestria, Twilight Sparkle and her friends come to an unlikely solution.

Everything happens for a reason, even if you don't know what that reason really is. After some untold period of time, Cozy Glow awakens and finds herself freed from her imprisonment. Unsure of where she is, how long she's been gone, or how she escaped, there's one question that haunts her and demands an answer - why was she released...

Artwork by Rhorse

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Guard
noun

1. a person who keeps watch, especially a soldier or other person assigned to protect a person or to control access to a place.

There is more to a Royal Guard than meets the eye. Capturing crooks, chasing ruffians, fighting monsters, stopping assassinations, and protecting the Princess with all their worth -- with a thousand years of peace time, they have become more and less. But the future is uncertain, and within the horizon, the dark storms are a brewing.

Aiming to become a Royal Guard had never been Twilight's first choice of career -- it certainly was not what Mom and Dad wanted her to be. Still, that didn't stop Twilight Sparkle to pursue that dream. Now that she was one, she had to deal with monsters, cultists, vengeful ghosts, prickly teammates, forgotten childhood friends, and a Sunset Shimmer. Not exactly what she had expected out of her military career in peaceful Equestria, but perhaps it wasn't far off from what she wanted.

Serious thanks to Sunglow for offering proofreading and commentaries.

Link to the Spacebattles Thread

What if Twilight had remembered a reforming spell? How would this decision affect Discord, Fluttershy, herself, and the whole of Equestria?

Cover art made by TheOperaticOne

Russian translation: https://ficbook.net/readfic/9144801

Day Four of #FluttercordWeek

Featured on 1/23/20, 1/24/20, 1/26/20,
1/27/20, 1/28/20, and 1/29/20

Twilight Sparkle accomplished something incredible, something not even the great Starswirl could manage. But ascension into the ranks of Equestria's princesses is not without its difficulties. Before she can take her place as princess of Friendship, Twilight must travel to the underworld and make a ceremonial offering to Death in exchange for her immortality. Twilight is more than a little surprised to discover the identity of the pony under the hood.

After years living in Ponyville and getting to know her friends, Twilight always assumed they were exactly what they seemed: a group of friendly and ambitious ponies. But as it turns out, the sort of pony who saves Equestria and decodes the ancient mysteries of Starswirl is likely to attract ponies a tad more interesting.

Updates on the 3rd or 4th Friday of every month, then daily until that section is complete.

Editing by Two Bit and Sparktail. Cover by Zutcha.

Twilight Sparkle has ruled Equestria for over a thousand years. From her throne atop the floating city of Concord, she enforces ruthless harmony over the handful of surviving settlements. But Twilight is afraid: Equestria's survival always hangs by a thread, as enemies more ancient than the Alicorns threaten to return and devour what she has built.

Twilight selects her star pupil, a young unicorn named Star Orchid, to travel down from the perfect city of Concord into the dangerous ruins beneath, so that she might locate these forces, and help Twilight to destroy them. Only when every threat to Equestria is finally dismantled will she be able to rest. Until then, there is much left to purify.

Edited by Two Bit and Sparktail. Cover by Zutcha

Updates Wednesdays.

This story was commissioned by TyrannisUmbra, with additional funds donated by my enabler, Two Bit. If you'd like one of your own, drop me a PM!

This story takes place in the same universe as Why We Dig. I'm not going to call it a sequel, since none of its characters will be aware of anything in that story, so you won't have to be either.

This story is a sequel to the dragon's den dream

two weeks after being offered the contract, spike decided to accept it and return home to meet his birth-parents; not just for him but so that he may protect all of his friends. unfortunately neither twilight nor the others see it that way and will be willing to go through tartarus and back to retrieve their friend. worse still, spike's new noble dragon friends would do the same to ensure that he arrives at the vlemm enclave. And when certain members of royalty get involved not just from equestria, but the other kingdoms as well. Then there will be enough chaos in the land to make discord shed tears of joy.

cover by bluewolfartista

There are many stories where Twilight tells off her friends after the Wedding. But that's not really Twilight's bag, she gets worried she's failed, or depressed, not angry. So here is a different bridal path, one where Twilight acts decisively to try and redeem herself in the eyes of her friends and sovereign, and ends up travelling to places she never imagined, facing dangers and foes she never dreamed of and making even stranger friends. Of course, there is still a 'reason you suck' speech delivered, but delivered by the last person anyone would expect...

Cozy Glow dreams within the stone—a dream so deep, so long, and so faint nopony knows about it. Except for Discord. Diving in secret past Morpheus’ jaws, Cozy is Discord’s stone to roll uphill.

Edited by the lovely GaraTheAuthor, proofread by the conscientious Pocketbot.
Credit for the picture goes to Bra1nEater over on Twitter.

Reviewed by Present Perfect on May 28th, 2020, here, by TCC56 on May 12th, 2021, here.

Featured from November 13th to 16th, 2019, and reached 2nd spot in the box. Thank you, readers!