Twilight Sparkle has spent years as Discord's protege, studying the Magic of Chaos. But when rumors of a strange phenomenon dubbed "Friendship" show up in a small outlying town, the Emperor sends his star student to find out what's going on. Twilight goes with the best intentions and quickly discovers there is more than meets the eye going on in Ponyville...

Inspired by this post on r/mlpwritingprompts, by MetaSkipper. Original version by me is in the comments there.

Continued here!

This story is a sequel to The Assembled Letters of Twilight Sparkle, Protégé of Emperor Discord

After getting a taste of Friendship and questioning her allegiance to Discord, Twilight Sparkle chose instead to accept the will of Chaos and remain a student of the Emperor. Now, she has been charged to return to Ponyville and plant Seeds of Discord around the Tree of Harmony, but there are more things than broken friendships awaiting her arrival in Ponyville.

A note on the [Dark] tag: This fic is not grimdark.

It is however, an adventure story with high stakes, and themes that may touch on more serious matters, such as brainwashing or mental/emotional abuse. There is also some brief moments of violence and intense danger that, while not excessive, may be troubling to some. This tag was actually something recommended by one reader after Discord's psychological games with Twilight in the previous story, and I think it's time to add it. Link to reddit discussion where I made the decision, slight spoilers for Chapter 6.

Please don't let it turn you off from the story, just consider it fair warning that some parts may be slightly disturbing to more sensitive readers.

This story is a sequel to The Three Sisters: Extended Family

A story of The Three Sisters Universe

Families are like fudge — mostly sweet with a few nuts. ~ Unknown Author

Chrysalis' daughters are serving their community service in Ponyville. Nothing can go wrong. Right?

Unless they all have their own agenda, and surprises keep piling up, complicating matters further. But anything to broker peace between the Changeling Nation and Equestria... right?

Art by the incomparable Conicer!

Now with a TV Tropes page! Warning: Will Contain spoilers.

This story is a sequel to My Little Changeling: Friendship is Weird

After the most important changeling artifact, the Evershifting Stone, is stolen by ponies, one changeling is blamed and exiled. How can he earn back his place in the hive? Find the thief and bring back the Stone.

He tracks the thieves all the way to Canterlot, which has changed a surprising amount in the past year and a half. Can he really find a thief among the confusing mess that is pony life and changeling integration?

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Cover image graciously provided by Raster!
Found on Equestria Daily here!

A few years have passed since Princess Luna was purged of the evil known as Nightmare Moon by the Elements of Harmony. She took back her rightful place on the throne of Equestria at her sisters side.
On a sunny day, a couple of seemingly mundane events trigger memories long forgotten. Memories of a secret Luna hast kept to herself for far too long. Facing Celestia won't be easy. But she has no choice. It is her duty to care for her subjects, and she has to retake the responsibility she could not fulfill while banished to the moon.

In terms of full disclosure, the story got a review by TheifofZ.

What has happened since her disappearance? What will she find? A joyful reunion or devastation? What happened to her Children of the Night?

Inspired by Children of the Night. Cover art is a screenshot from the video. I do not know if there is an "official" story for the Children of the Night and I do not claim mine to be "canon" in the context of the video. These are just my thoughts on what might have happened back in the days.

This story takes place right before the season 4 finale.

Diamond Tiara has always enjoyed picking on the Cutie Mark Crusaders. But one day, she finds she's gone too far, and everything for her comes tumbling down. But help may come from the most unexpected of places...

Started before season four, and does not take season four canon into account.

This story is 100% Diamond Cutters Approved!
Note: If reading this inspires you to write your own Diamond Tiara fanfics with similar premises, send me a link, as I'd love to see them.

Dearest brother, where have you gone? Your orb keeps the city safe, and yet I feel drawn so to stay. It appeared above the city, and I felt you through it. Was it wrong to want you so? Was I wrong for being unable to resist the ache in my chest? Now I search this unknown sky, unable to go back.

I miss you brother.

Aka: Latias goes through a blue portal into the mlp universe.

A quiet evening with Fluttershy turns into a nightmare when Discord finds Eris, his mother, at the front door; asking how his plans of causing chaos and disorder across the land are going.
Needless to say, Discord tries everything in his power to make sure she doesn't know he's reformed.

We all know Fluttershy, a yellow Pegasus pony hailing from Cloudsdale, shy as a fly friend to all animals and practically kindness incarnate. However, the world can be deceiving, what if Fluttershy was not pony but a rare creature called a changeling queen? What would this mean for Equestria and Fluttershy's friends and who else will be drawn in to the fray in this story of the lost and the forgotten?

cover art by "The-Clockwork-Crow" on deviantart
http://the-clockwork-crow.deviantart.com/art/Changeling-Egg-447190688