A hidden museum rests in the Canterlot palace, by law open to the public, by practice closed to visitors. Within its walls lie treasures of opal and gemstones, salt and wood. Shelves filled with untouched scrolls line the walls.

It is here that Luna pays her respects to Equestria's fallen heroes. Why, then, is it against her sister's wishes?

In a sunless world, there's no hope of light touching the world again. An evil Queen has plunged the world into a everlasting night, with elements of darkness and chaos leading her armies to total conquest. Ponies have lost their freedom and are forced to work as slaves in harsh conditions. It's only natural for a rebellion to bring the light back to a dark world, as well as the harmony that should have been there all along.

This story is a sequel to Celestia Visits Nightmare Moon

Two weeks after the Summer Sun Celebration, Celestia comes into Luna's room to spend time with her, only to find out things aren't what they seem.

It was supposed to be a simple stargazing trip up to the mountains. But what Moondancer discovers hidden in the moonlight may change her life forever…

...or may, at least, wear too much eyeliner.

For on this night of nights, there lurks a pony of deep darkness: Moonlight Raven, whose adoration of the strange and mystical not only rivals Moondancer's respect of science and reason, but is physically preventing its pursuit.

Can these lovers of the night find common ground, or are they fated to annoy each other to death?

Pre-read by Bookish Delight and Rune Soldier Dan following an appearance in the November 2015 Writeoff, "Out of Time". Cover art assembled from here and here.

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

In a jealous rage, Princess Luna rebelled against her sister, embracing the darkness in herself readily. The newly transformed Nightmare Moon and Princess Celestia fought above the Castle of the Everfree; after an arduous battle, Celestia lay bested by the sister she'd fought so hard to keep under control. With no other choice available, Princess Celestia wielded the Elements of Harmony.

Now, Nightmare Moon rules over a dark Equestria. She finally has the power of which she'd dreamed for so long.

She only wishes she didn't feel so wrong inside.

Story image is vectored out of this one and this one.

(Thanks to Rated Ponystar for the prompt)

The Canterlot Wedding was a disaster. The Changeling Queen took the lives of Celestia, Twilight, and the bride and groom. Only Luna remains now to patch up her broken nation, but Chrysalis has approached her with an offer she can't refuse: Become her lover.

Luna accepts.

A young colt asks the Night to take away his dreams.

Reading by The Crystal Maiden and I.

Nightmare Moon's escape from the Moon could not have gone better for her. Celestia herself was unable to face her, and Celestia's trainee was woefully underprepared for the assault. It did not take long to shake out the remaining pockets of resistance, and then she took the throne for herself.

Ten years of darkness have passed, and Celestia has finally managed to break Nightmare Moon's spell and return to Equestria. The exile and the difficulty of the escape took a serious toll on the solar Princess, and she returns to a land very different from the Equestria she loved.

Weak and very nearly alone, she needs to rebuild her strength, and put things right again. But can she even be sure what right is, anymore?

Google Docs link: https://docs.google.com/document/d/1I1UxgjF5VdpCmAJ85ir84lWTk2BKGCainy_VICPo6yM/edit?usp=sharing

Lulu Print Link:
https://www.lulu.com/en/us/shop/tursilion-/night-reigns-mlp/paperback/product-12qjj92p.html

EBook Link (mobi format):
https://harmlesslion.com/text/Night%20Reigns%20-%20Tursilion.mobi

Celestia knew something terrible was about to happen. Sure, everything seemed fine, but she knew better. Something was very, very wrong.

Her fears were confirmed when a magical being from the distant future told her that on that very night, Equestria would be destroyed and all would be lost. There was no way to stop it. The darkness was coming and would consume everypony. There would only be one survivor – and it was not Celestia.

The world’s last night had come.