"It has been the pivotal teaching of the great Fountainhead, personal mentor and Celestia's most esteemed archivist, that the grand unified theory of magic, if discovered, is to be found within the mage's affectivity –that is; of the polarizing impetus of love, for unicorn magic, and hate, for Black Magic. It is claimed, further, that reality itself, too, is subject to this principle; and to deny so was self-contradictory. The dogma, however was not uncontested. Unicorns, Mages and Archmages from all over Equestria of all emotional preconditions would challenge and confute the thesis with ease. It was here that the great Fountainhead replied that the grand unified principle was too profound to be felt and too minute to be perceivable. He posits that, though invisible, this maxim holds together the fabric of the universe: matter with magic; existence with consciousness; dreams with reality; and–most significant of all–ourselves with one another."

-Starswirl the Bearded, "Hermeneutical Phenomenology of Pre-Classical Metaphysics", Royal Canterlot Archives (323 L.B.), p. iii-iv

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EDIT 04/16/13: Remastered version coming soon! Grammatically sound, split into several chapters and improvised.

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.

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!

We all know the story of how the Princess’ young student and five friends defeated Nightmare Moon and brought Princess Luna back to our lands. But what if the tale were false? What if the young Twilight Sparkle on the event of her entrance exam had not been rescued by Princess Celestia, but instead lost her mind among the power of her youthful surge and had to be sent away, far away before she could destroy all of Canterlot with her newfound power. Now the feral unicorn prowling the Everfree Forest only vaguely remembers her past, slipping away from constant terrifying attempts to capture her.

And she is beginning to remember what true power felt like.

Editors include: Peter, Justin, Featherprop, Mitch H, and Bad Horse
Featured on Equestria Daily
Reviewed by Chris on One Man's Pony Ramblings and by Paul Asaran on his review blog
Now with a TV Tropes page

Physical books are available on Lulu.com
Monster in the Twilight (Paperback) 272 pages
Monster in the Twilight (Hardback)

The nightmare of that evening haunts my every waking moment.

A flash of light.

Her powerful form with wings spread wide before me…

She was not just my mentor.

She was also my best friend and for that I will always be grateful for knowing her not as a Princess of Equestria, but as Celestia… The only one who really understood me...

But now? Now I can never tell her how much I truly loved her and how much she meant to me.

They took her away from me.

So I will take everything away from them.

There is a sequel! D=S-M2 and side story! D=S-M: Emerald Mirror

((Somehow Featured on: 12/03/2014 and again on the 06/07/14... mad.

Much love and all credit to the artist: Ventious who owns that picture and is all kinds of awesome. While I have yet to get permission (working on that one at some point), I will remove the picture if the artist demands it so.

And much thanks to these guys for helping me edit/proof and generally bounce ideas about this monstrosity: Grammar Nazi Tach, Discorded Discord,Curify, Lord Inquisitor
TheAccidentalBrony))

A few hours after saving the Friendship Games, Sunset Shimmer and her good friend Twilight Sparkle are relaxing on the CHS lawn. The two are so close that Sunset finally feels like she can ask a question that's been on her mind for a while.

"Can I go home?"

I am not Twilight Sparkle.

I have her body, I have her memories, I have her power. I am not her, and I have done such terrible things. This is my story.

Twilight Sparkle comes across a small, battered diary detailing a new form of transportation. While the research is sloppy and the notes incomplete, Twilight takes it upon herself to see that the ancient project is completed.

Of course, nopony said it would be easy.

This story is a sequel to The Monster We Made

She betrayed us.
She mislead us.
She imposed her rule upon us.
We rose in defiance.

In the far reaches of Canterlot Castle, high above in the towers lived the archmage. Everypony knew her, yet few had met her.

Twilight Sparkle sighed, having teleported away another noble seeking favors before reaching the top of the stairs for the second time today. They never learned. As the archmage, she already dealt with political squabbles far too often without inviting them into her home. Aside from personal favors for Celestia, she did what was required of her position and then returned to seclusion and research.

The nobility grumbled that no archmage should be a commoner, and Twilight’s disrespect toward them proved it. Each and every time they were forced to bow to her, they hated what they saw: the position, the status, the deference.

Was she not powerful? Was she not great?

Twilight, now reading through dusty scrolls and long forgotten tales, wrote in her notes — notes gathering dust of their own. A brief thought flashed through her mind.

Am I not powerful? Am I not great?

And then Twilight picked up The Tale of the Royal Pony Sisters.

Defunct side stories told in Across the Boundary. They can still provide a little context, but when in doubt, the main story here is canon.

Cover art provided by Lafiir