Discord enlists the help of a long forgotten friend with a grudge against the princesses. This is the story of how old actions have consequences and can lead to true Regret.
The Elements, The Princesses maybe even Discord Himself will learn that when you give a Human magic and Happiness that they will do anything to hold on to it
Or at least it's memory.

(starts during the season 2 opener)
rating is subject to change

Following his tumultuous defeat, King Sombra is flung across space and time to exit out a human's malfunctioning toaster. For weeks, Sombra monologues his revenge to destroy those that hurt him. But seven months later, when a route back to Equestria is found, does he not seem all that interested in returning.

Edited by spigo.

Prequel: The Roommate From Tartarus
Side Sequel: (Not My) Home Sweet Home

Update: labelled as complete. The last three chapters will remain as bonus chapters.

Equestria is still picking up the pieces after the defeat of Tirek, and everypony is helping out with the paperwork, even Rainbow Dash. Things change when Princess Celestia arrives, bringing with her a letter with some very stunning accusations of the exploits of a resident in the town of Oasis. Now, the main six are tasked with finding out if the letter was truth or fiction. Did this Mister Baker really do what they claim? Only one way to find out.

However, Mister Baker is not who, or what they expected.

Rated Teen for occasional language. Additional tags added for more dark themes.

Proof read and edited by the amazing SunnyPack , Snakeskin Ducktape, and Tyrannosaurus Tux.

In the magical land of Equestria, two alicorn sisters raise the Sun and the Moon every day to give the world a night and day cycle, basic for the survival of life. There are also two alicorns who rule over two very core aspects of life and harmony itself. Those are Love and Friendship. While not as ancient as the two sisters, all princesses are essential to the world's balance.
This balance is also sustained by the hard-working ponies, who make the seasons change and manage the weather to fit their needs, so everypony has enough food and water, and every animal is also attended to assure that any of them are caught in the changes of seasons.

But what about the planet itself? What about Mother Nature?
This is the question that Gaia asks when she arrives to this foreign world. After so much work her son persuaded her to take a long vacation in Equestria, saying that she needed one and assuring her that he would be in charge now, and she must take a break. But what can a several billion-year old alicorn possibly do to pass her time in this land?

(SimEarth/MLP Crossover)
(Timelife of Gaia's life 'till the start of the story)

(A PoE story.) Additional Tags: (Slice Of Life)
All Twilight wanted was to give Spike a special gift for his birthday. Yes, it was a book, but it was a very special book. An Enchanted Book like that Power Ponies comic they had recently experienced.
Things went wrong when Spike startled Twilight as she was working the spell for his (secret) gift. Needless to say, startling Twilight while she's in the middle of a spell can be a bad idea - as certain frogs can tell you.
Twilight has every reason to believe that she is now trapped in a closed reality bubble fabricated out of her own magic, with no way out. She's lost in some made-up universe reflecting some random story line.
Mike, of course, has a different opinion about the matter.

WARNING: Both Twilight and Mike love talking technical and explaining things to each other.

Twilight's World now has an audio reading by No One and Nobody. Listen HERE.

This most excellent cover art was provided by Void Heart

Celestia almost believed that her marefriend's visit was going to be relaxing and more importantly uneventful.

"Almost" being the keyword.

From romantic hijinks to politics to other insane happenings this visit is going to be a tad bit scrazy.

But that's okay, because Celestia doesn't sweat the small stuff.

12/15/14: (Just edited 3rd chapter. Sorry about the grammar, I need to stop writing when I'm tired. Let me know if there are more problems)

It has been one of the closest guarded secrets of Canterlot's royalty. Deep in a specially constructed dungeon, surrounded by warding spells and powerful magic barriers, exists an enigma. Within a cage that could only be described as something out of a nightmare, it waits and watches all of Equestria. A creature that cannot age, is immune to disease, does not thirst nor hunger, and resists all injury. But, it also holds secrets and knowledge that could safeguard the kingdom. Its powers are frightening, but it is civil enough for debate when patience permits.

Princess Celestia has sought counsel with the creature before, enduring it making deal after deal for its services. The Princess walks a fine line when dealing with it, knowing full well anything could give it an advantage despite its imprisonment. She has had to go back on her word in these dealings, and from this a deep animosity between them has been born. It is a necessary evil as she is convinced this is a being capable of untold evil far and above anything Equestria has ever dreamed of. So long as it remains within the confines of its cell, her kingdom is made safe. So much magic has been woven to ensure that, there is little chance of escape.

So long as the magic holds, there is no danger. So long as the cage remains strong, the nameless creature stays enthralled in his cavernous dwelling. If that were to change--if the magic failed--not even the wisest could say. But one thing is assured, it does not bode well for Equestria.

This story is a sequel to Code Blue

The Dazzlings are forced to spend a whole night with Pinkie Pie and her crazy sisters.

Rainbow Dash has a run-in with the cops.

I suggest reading Code Blue before Pink because you will be lost

Also, I regret nothing.

Takes place in season 1

Twilight Sparkle, mostly settled in the small town of Ponyville, finds herself at a loss as ponies start letting themselves in (literally and figuratively) into her life. On her end, she and (for some reason constantly brought in conversation) Spike are doing perfectly fine.

But the ponies... Oh, the ponies are in a uproar as they wonder and ponder the big questions.

What did Twilight 'do' to get sent to Ponyville?
How exactly was she coping living 'alone'?
What really was the story about Spike?
Didn't she need 'help'?

A young thang like herself, raising her son alone in a little place like Ponyville, needed all the help she could. Or not. Maybe, she didn't. Being a fool who got herself knocked up and thrown away from the Princess on high...

Cancelled do to lack of motivation. I apologize if you were in the group of people that enjoyed this story.

Isn't great when childhood experiences come back to haunt you? Rainbow Dash certainly agrees.
And now she's been tied into some orchestrated madness as she finds herself a teacher, a performer, and a competitor.

A story of piano-related nonsense at the hooves of one high-flying mare.

Written as the B-side to Equinophobia. The stories are not related otherwise and can be read separately.