Celestia had a niece once, not an adopted niece like Cadance, an actual biological niece, the daughter of Princess Luna. Sadly when Luna became Nightmare Moon her daughter took her mothers side and led the their forces against Celestia.

Princess Twilight was killed during that battle, or so history tells us...

Featured on the 11/10/2015! Thanks so much!

Days after Tirek's near-takeover of Equestria, The Great And Powerful Trixie travels to Ponyville, intent on settling her rivalry with Twilight Sparkle once and for all. No trinkets to fudge her abilities, no megalomania to apologize for -- just pure and simple magician's honor!

Upon her arrival, however, she quickly learns that the information she has on Ponyville -- and Twilight -- is more than a little dated.

Edits (as well as a bit of scene inspiration) courtesy of nanashi_jones.

Words and actions can sometimes hurt more than we know, sowing betrayal and hatred where friendship and innocence lies. A single thoughtless action can be a tipping point, one fallen domino setting off hundreds. Look back, and answer me.

(Brand-spanken new) TvTropes page here
Story theme is Chronophobia

It's been uncounted millenia since the last of Twilight's first friends passed away. Even their names have passed into legend and myth, forgotten by the slow march of time. Now on a far away planet, she finds her musing upon all of her friends over the long years interrupted by her latest faithful student, Calming Waltz.

Now if she can only get that silly pony off to her wedding, and maybe teach her something about why her romance and wedding to come is so special and wonderous... Or at least something for Twilight to get a laugh out of, anyway.

This story is a sequel to Kiss of the Dark

Six months after the events of Kiss of the Dark, Twilight is deep into her pregnancy with Sombra's child. The foal is due any moment now, and she grows more excited by the day.

However, her memories of Sombra still haunt her. Torturing her in her dreams, making her feel guilty for the things she's done with him....

Once Celestia catches wind of it, she takes it upon herself to help her former student once more. After all, its best that they fix things once and for all before the foal arrives...

Cover by AmberSolaen/Starburst Dawn.

Reading Kiss of the Dark before reading this story is recommended, but not required.

After browsing the magic books in the late afternoon Princess Twilight accidentally recites a spell that turns her back into a filly except with her new found ascension; she has now been turned into an Alicorn filly. Now the princesses of the sun and moon have to take care of her...for however long that is. Can they find a cure or will Twilight start her life over again?

I am sorry for any similarities to any other stories, I can assure you these are all my ideas.

Twilight didn't know what came over her. At one point, she was having a wonderful tea party with her friends, and the next thing she knew, she was trying to kill the princesses.
This could have something to do with the fact that nopony would listen to her at her brother's wedding, everypony thinking she is crazy, or even the fact that Discord was set free without anypony noticing.
She finds herself at Celestia's court, facing crimes she didn't commit.
"Twilight Sparkle, for stealing the Elements of Harmony, attempting to kill me and Princess Luna, and Betraying everything you were supposed to protect, you are hereby banished from Equestria, never to return!"
Celestia's words continued to ring in her ears as she followed the road out of Equestria. She would never see her friends again.

My entry to The Exiled Competition

Cover art can be found here. It was made by StarlightSpark on DeviantArt.

King Sombra survived his defeat, but just. By the time he returned to form, Twilight became the newest princess of Equestria and the Crystal Empire was restored to its former glory.

He cannot take over Equestria the same way he tried before, but he has a card up his sleeve. Twilight won't see it coming, and Sombra might gain a powerful ally in the process.

And it will all begin...with a book.

Edits on Chapter 1 done with the help of TempesttheDragnix.

Major props to InuHoshi-to-DarkPen for letting me use this. That artist is really good.

Nightmare Moon spends a thousand years banished to the Moon, fighting herself and the Shadows both within and without. She watches civilization rise and spread, a quarter-million miles away.

Can she reclaim her power? Can she overcome the six champions her sister has sent to defeat her?

Why do three of the champions look terribly familiar to the renegade Moon Princess? Why does the sight of one, in particular, break her heart?

And why, as the battle continues, does she increasingly hope that she does not win?

This is an expanded version of the two-part Series Opener. From Nightmare Moon's point of view.

Now with its own TVTropes page!

If you want to find out what the Great and Powerful Trixie was doing in Manehattan, and what happened in some other parts of Equestria during the Longest Night, read An Extended Performance. The direct sequel, however, is All the Way Back.

The Witch of the Everfree... a tale that has spread among all who live by the ever illustrious forest, to whom the witch truly is, no one knows apart from the one herself... until now. Twilight Sparkle had lived in the Everfree throughout most of her long life, since the corruption she was alone until not long ago when she met few companions. Trained along side her sisters through bond in arcane magic, given true immortality, she continued her studies alone only every now and again seeing how her race fared. Now, forty years after she was dubbed a witch by her race, three little girls stumble through her woods in search of the ever mysterious "witch", what could really happen? read to find out.

FEATURED: 16/03/14

Clarifications:
Many have wondered what Twilight looks like and such so to clarify, she does not look like a human female, she retains her fur coat, she is of human height and has hands. The facial structure is more detailed such as where the eyebrows should be there is a darker patch of coat much in the color of her mane.

The story starts a few episodes in, around halfway through season one I would say, some shall stay canon whilst some with alter, I am sorry for this inconvenience.

Twilight is still Twilight in every way, though she has been with little to no contact throughout her life apart from when the Everfree retained people, in such her words would become haggard sometimes so that's why you will probably go "huh" when you first see her talk to the CMC.

That is all for now.