Applejack is chosen as The Nightmare's new host.

It really isn't that big of a deal. Until it is.

This story is a sequel to Midnight's Radiance

'By Shadow's Flare, dreams swallowed in Nightmare.'

Eternal night, unwaking slumber.
When everypony in Equestria is trapped within their own nightmares, it's up to one pony to save them.
Okay, one pony, and a changeling queen ... and maybe a former enemy. And also a baby dragon, as well as a shy filly?
No, wait-
There's only one pony to save them! A pony who will dive into her friends worst nightmares without even batting an eye! A pony that'll uncover ancient secrets in order to end this eternal night!
Who is this pony, you may ask? Why, none other then The Great and Powerful Trixie~!
Rest assured, Equestria is in good hooves.

Thanks to Cloureed for the cover, as always~!
Set in the Trio-verse, an AU where Celestia was banished, and Luna took up Sunset, Trixie and Twilight as her students. Recommend reading Luna's Protégé and Midnight's Radiance first.

Changeling Twilight Sparkle and her number-one assistant, Sunset Shimmer, try to study magic without learning any wholesome lessons of friendship. They fail.

After a freak accident, Princess Celestia finds herself in a whole new universe. As she seeks a way home, she is captured by none other than Team Rocket.

Welp.

Now on TV Tropes.

Several years after returning to Equestria, Luna spends most nights isolated in her room with only her tomes and music for company. Her sister began to notice a growing sadness from her loneliness, and together with Princess Cadence they decide to try and search for a consort to cheer up the Mare of the Moon.

The commotion of this decision catches the attention of Discord, who can't help but be thrilled with the idea of "helping" his favourite two alicorns get together.

Princess Twilight Sparkle travels to an abandoned ancient castle along with the Royal Sisters in order to investigate reports of inexplicable incidents that have been taking place there, suspected to be the work of bitter spirits. However, she has no books, or almost any source of information to provide her with leads.

Almost, except for a pure white teapot.

2023 edit: I started this story 8 years ago. I'm continuing it on a whim. My writing style has changed since, but most likely I won't be redoing/tweaking/editing the original 5 chapters. Hope you enjoy anyways!

The ancient necropolis of Nightmare moon has been awakened by her brief return to Equestria preceding her defeat. Now its abhorrent denizens are revived after a thousand years of debauchery and decay and with no direction or control. They will soon break free from their dungeons of night and spill across Equestria spreading darkness and death. That is, unless six friends, accompanied by the better part of the city's creator, can stop the spread of chaos and and gloom before all of Equestria falls victim to the things made in secret by an angry heart.

Twilight Sparkle broke time when she got her cutie mark. Now Twilight and Sparkle are sisters from another time. Twilight is hailed as the potentially greatest light magician of all time, and already has a reputation as a hero by the time she goes to Ponyville. This isn't her story, not primarily.

Sparkle is an orphan - her dark magic killed her parents. She lives with her brother in Canterlot's industrial sector because they can't afford anything better. She can't leave either. She's a natural dark mage; while Sparkle won't go mad like Sombra, her reputation is hardly any better. Worse, the law doesn't see her as a good pony.

The fact that the dead don't stay dead around her, or that Thorn - Spike's double - is an undead, soul-eating abomination, are other matters altogether.

(Also has some Slice-of-Life, but fimfiction tags won't let me put it with Adventure.)

Has an ask blog to go with it: Ask Sparkle and Thorn.
Also has a TvTropes page: Split Second Tropes.

Featured on EQD.

Cover art by Swirling Line.

The first trotters, exploring the Long Trot, had found no trace of modern pony away from Prime. Certainly, there were some stone tools, fossilized remains of hearths in the depths of caves, and even a few equine bones. But there was no great gallop forward: no cave paintings, no burial mounds, no cities, no technology. The spark of Harmony must have been lit behind millions of protopony brows on a million worlds, just as on Equestria Prime, but it hadn't caught anywhere else.

There were equinoids out there, descendants of lost cousins of pony-kind, but ponies knew they would never encounter another creature that was anything as smart as they were. Never something that could speak Equuish, for example.

The only thing wrong with this generally accepted picture was that it was totally incorrect.

This story is a sequel to Celestia's Tiny Student

(Title changed from "Ponyville's Tiny Librarian" for reason pointed in this blog )

Twilight Sparkle is a one-kilogram pony the size of a large rat, shrunken by Princess Celestia following her entrance exam to the Celestia’s School for Gifted Unicorns to ensure that her power surges would not pose a danger to the ponies around her.

She’s spent thirteen years full of hard training at her new size, facing the life-threatening experiences that came with living in a world of giants. To survive those thirteen years of hardship and joy, of learning and adventure, and of pride and humility, Twilight has challenged herself to be stronger, to overcome any obstacle.

Now that tiny Twilight is on her way to Ponyville to oversee the preparations for the Summer Sun Celebration, how well will this miniature mare fare outside of the confines of the castle? How will the other Element Bearers react to her? How will Nightmare Moon react to the tiny unicorn? Is Twiny prepared to face Ponyville, and, more importantly, is Ponyville prepared to face her?

Credits:
Art cover - kc day

Top editors: (editing and rewritting for months, hope quality is to your liking).
Kydois
Georg

Nightmare Moon's sentences editor:
Bahatumay

Applejack accent editor:
Crimson Star (Chapter 1 - Applejack)
Rebel Brony
The Notebook is grounded

Pinkie sentence's editor:
Plump it UP

Other editors:
Hereward
tana1100
Lab (small editing from prologue to chapter 4)

Pre-reader:
Rated Ponystar

To celebrate the release of this sequel, I created a group called “Twinyverse” for all fans of this story where you can talk about it and track all side stories with ease.
The Twinyverse Group