After a tragic accident, a human ends up in Lord Tirek's body, as part of an attempt to reform the villain after his recent escapades. While the hero of our tale is trying to make sense of his new surroundings, the rest of Equestria thinks that the most terrible threat that their world has ever seen is back...
And the powers that be are definitely not happy about it.
New Cover Art By Shadow Bolt

Upon gaining access to the multiverse, some people go on fantastic adventures: rewriting history or exploring the vast unknowns of time and space.

Twilight Sparkle had another idea.

Featured by Equestria Daily on 3/17/17

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

Life is a funny thing, but death is funnier.

Twilight Sparkle was ecstatic to become the personal student of the princess, if only she knew what that entailed. Celestia only wanted to use Twilight's magic as a weapon, to crush any who would oppose her, but in order to do so, Twilight needed to be broken first.

Celestia wakes up in human form and at an insane asylum where similarities between the world she is in now and the world of Equestria cause her to wonder if Equestria even exists or if she simply made it up to escape her human life. Does she try to hold on to her memories of her Canterlot life or does she let them go and accept them as nothing more than stories? Who is she going to trust? Who is she anyway?

This is only the beginning...

TV Tropes Page

Cover Art by blahblahaha123 (with some altering by me.)

Reading by Phantom Brony

Editors:

Csquared08, DarkPheonix, Gweat and Powaful Twixie, HenryAnthonyCourtler, Kaidan, KartalTheWriter,ZeroOmega

Sunset Shimmer finds herself stuck in a time loop where she's forced to live out the main six singing a song to help Twilight win the crown over, and over, and over...

And over...

Except, things start to get a little... weird, at one point in the song.

The newly coronated Princess Twilight suffers an abrupt tragedy. Having lost two loved ones, she begins to question her own mortality, and that of her friends.

AJ, Dash, Rarity, Pinkie, Fluttershy. . . they are just the beginning. Twilight will live for thousands of years, so every pony she cares about—every pony she will ever care about, will die.

She could barely handle the pain of one funeral, let alone the thought of hundreds of them. Twilight finds a clever way to ensure all of her friends never die. They can’t all be ageless alicorns, but they can all move into Twilight’s Dollhouse. Then they can be best friends forever.

Sequel: Twilight's Dollhouse 2
Fanmade Song: Twilight's Dollhouse

Source: Dreampaw
Editor: Gage of Grandiloquence, Breath of Plagues
Pre-read & Idea pony: TypeWriterError,
v1.1 Revised chapters 1-10 on May 1st 2013
--Pending a few more revisions, including ch. 14
Now on TV Tropes.

Something isn't right in Ponyville. Everypony is acting strangely and Twilight can't figure out why.

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Terrific reading done by Voiceguy. Check it out!