After discovering that Cadence is not who she appears to be, Twilight is sent to another world entirely by the disguised Changeling Queen to avoid her plan being disrupted.
When Twilight lands, she discovers that not only have Spike, Owlowiscious and Peewee followed her, but that they've arrived in a world where the main sentient species is human.
There's still a place where they teach magic, though.
Crossover with Harry Potter. Twilight will be effectively taking the role of Hermione.

I've marked this story as cancelled to reflect the unlikelihood of it continuing. If I do come back to it I'll revert that.

When Twilight Sparkle was just a kid, her best friend was a girl named Sunset Shimmer. Though their friendship had a bit of a rocky start, they quickly became inseparable, no matter how much everyone thought of them as ‘weird’. They were there for each other.

Were.

Years after the tragic accident that tore them apart, Twilight is determined to move on from her loss, and she sets off on an independent research project to investigate the strange happenings at Canterlot High. Little does she know that she will soon come face to face with what appears to be a literal ghost from her past.

Coverart by Kare-Valgon. Chapter illustrations by Zorbitas.

Edited and Pre-read by Dubs Rewatcher, r5h, and Kalan.

Takes place after Rainbow Rocks, but was written before Friendship Games and does not take it into account.

Chinese translation

Print copies now available.

Can the Twilight October evade the clutches of the Equestrian navy and bring glory to the Motherland?

When trust is betrayed and ideals are discarded, does the Twilight October have what it takes to survive?

Also, Pinkie is a shark.

Update: The story is edited into a proper read without many of the horrors I originally put into it. Enjoy the ride!

Deciding he could be given another chance, Luna and Celestia come to an agreement to release the Chaotic God from his rocky imprisonment, locking his powers with a powerful spell. Magicless and with a chance at redemption, Discord's ways seem less chaotic than ever.

He does cause a lot of chaos though, to the faithful student of Celestia, who had eagerly taken over the task of watching over and teaching Discord by giving him a home under her own roof, in the process hoping to learn more about his species, powers and motives but surprisingly learning much more about both himself and her head... Which puts her in pretty amusing situations most of the time.

An adventure of a silly one sided (???) love and a look into the heart of Twilight Sparkle.

Twilight is invited to Canterlot to compete with some of the greatest magicians in the world for the Moonstone Cup, a prestigious award for the most powerful and skillful magicians, unicorn and otherwise. Can she win? What sort of competition will she face?

Awesome cover image was taken from NoOneBahtim

A slice of life as Twilight learns that becoming a princess is a lot more than she bargained for. (Note: This is written immediately after the end of Season 3. Cover art is Mandala by Whitestar1802 - http://whitestar1802.deviantart.com/art/Mandala-355858836 )

Three years after she first gained the Element of Magic, Twilight learns that it has a whole lot more in mind for her than being a simple librarian. Twilight falls into a coma to adjust to her new abilities and Celestia follows her to try and help. Unfortunately, while the sun goddess is away, monsters come out to play. An unexpected enemy declares war on Equestria while the princess sleeps. When Twilight awakens to a new world, will she be able to save it with her new powers?

Updates will be highly sporadic. I am going to need a plethora of OCs, so please submit them either as comments or PMs. You will be credited for your suggestions.

The title is a work in progress, as is the description. I may change to mature rating later, depending on the content of future chapters. This is an experimental first pony fic, so we'll see where it goes.

This story is a sequel to Post Nuptials

In the aftermath of the wedding, Spike is bitter and avoiding everyone. Twilight's determined to find out what's bothering her charge, but she walks a very fine line when dealing with an emotionally distraught child.

Meanwhile, Rainbow Dash suspects something's wrong with Scootaloo, so she starts spending more time with her in hopes of picking the secret from her brain. As she begins to truly mentor the young filly for the first time ever, she begins to see the advantages to having a little sister.

And while all this is going on, Pinkie is struggling with some old family issues that have been brought to the surface, meaning she might have to confront her past at last.

Art by Conicer

After returning home from viewing a meteor shower, Rainbow Dash finds a green rock in her room that makes her violently ill when she touches it. As she and her friends work to find out what exactly happened, she will come to learn more about her past, her family, and her place in Equestrian society.

Cover Art provided by Supersheep64

Comments may contain spoilers. YOU HAVE BEEN WARNED!

He couldn't let this lie, not now. This was his chance to pay back the one person who truly changed his life. Red Mann didn't give him this assignment, Red Sniper made this one himself. The others will not help him on this, the skilled assassin decided this was a job he can only do himself. No other shall get involved, her life was his to save... No one else's.

The BLUs were after the one that pulled him out of the gutter, out of the darkness within his mind. They showed him quite a time, and always had that smile on her face. She made him feel good about things, made him want to keep seeing the next day. To keep fighting on, so that she could keep smiling.

That's a promise, and a professional keeps his promises.