A long, long time ago, there was a knight who set out on a noble quest to save a fair maiden and, if possible, slay the dragon keeping her captive.

Only... things don't always go as planned.

Many thanks to the incredibly talented hattonslayden for letting me use this picture for the cover art. Check out his work some time!

Update: featured? Oh my... I feel all tingly inside...

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.

Given the successful befriending of Discord, Princess Celestia deems that no longer will villains be defeated but instead reformed. While most have the chance to submit willingly or continue to fight, King Sombra is given little option. Brought back from the dead and stripped of all his powers and strength, it's all become a game of futility. Now Sombra only wishes he could have stayed dead all along.

Edited by spigo.

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)

Daring Do cannot believe her luck when she is asked to help explore the most ancient tomb known to ponykind. But terrible danger awaits her, for beneath the earth rests something beyond equine understanding.

Warning: comments contain ending spoilers.

TVTropes page.
Alternate ending by Duplex Fields.
Archived in the Pony Fiction Vault.
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After an existential journey goes wrong, a man finds himself in Equestria. With no way to return home he has no choice but to find a path in a new body. Will he discover a place to belong once again in this new land, or be forced to carve one out?

Currently rewriting first eight chapters and editing the rest of the story. Plot will be fundamentally the same, just the quality will significantly increase. There will be some story and character changes.

As of right now the story ramps in quality with some bumps due to edits.

Starswirl the Bearded: widely regarded as the greatest unicorn wizard ever to walk the Earth. But was he really the genius history has made him out to be? Or was he simply a mad magician, whose unethical experiments in magic were justified by results pleasing to the eye of the public?

The answer is neither. Fortunately, he left a personal journal behind which might shed some light on who he really was.

Adorable bit of cover art from Eveyann

Pandinus Imperator (You can call him Pan, he won't mind) is knocked back in time during the Canterlot Invasion, and accidentally kills King Sombra on arrival. Instead of being executed, the changeling is surprised to find himself being hailed as a hero, and is promptly put on the throne as the new monarch, the Crystal Emperor. However, Pan now faces a great many problems, among them Celestia and Luna, who seem certain that the changeling is secretly up to no good, as well as several political factions secretly plotting to undermine his reign. There's also the tiny problem of the constant snowstorm that threatens to cut the city off from the outside world permanently.
The Crystal Ponies need a hero now more than ever before. Why did they get a changeling instead?

We Has A TvTropes.

While not truly a part of Bucking Nonsense's Changeling-Verse, the same rules regarding changeling abilities and society apply.

Cover image provided by gabapple, used with permission.

All her life, Fluttershy felt different from the other pegasi. She preferred the ground to the clouds, and the simple love of her animal friends always seemed to refresh her... And she never really had to eat... She didn't remember her parents, either...

One day, though, her life changes forever, when she and her best friends find out what she truly is.