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.

History records that Nightmare Moon was sealed away inside the moon, but there are some who tell the story differently. They claim that she was banished not into it, but onto its surface.

If that's the case, what did she do on the moon? How did she keep herself entertained? How did the stars aid in her escape? And when the answers to those questions are revealed, can she ever live them down?

Cover image by KP-ShadowSquirrel.

Jack Frost, the newest member of the Guardians, vanishes into an unknown world, devoid of all but the most basic of his powers.

Pitch Black, the Boogy Man, falls through time and space to escape the ever pursuing darkness, and finds himself on a strange world with Jack, his old enemy.

Together they form a truce to find out more about the land and, unknowingly, form a bond of friendship thought to be impossible.

~~

Crossover with Rise of the Guardians movie by Dreamworks

Discord decides Equestria is a little too boring. Instead of risking his own neck, he drags the newly appointed Guardian of Fun from Earth to help him with his task. Little does he know the Darkness is still out there looking for its next victim to corrupt.

[Rise of the Guardians/MLP FiM Crossover]

Celestia has a dangerous creature held in the deepest of Canterlot's high-security dungeons. It can create ponies (with full backgrounds and histories) with it's strange and often-times prophetic powers. The Princess does her best to keep it under wraps, but its only a matter of time before it's "creativity" will get out of control.

Twilight Sparkle has spent months researching chaos magic, developing a new spell to unlock magic nopony has ever experienced before. But when something goes wrong with casting, Twilight finds herself turned into a Draconequus and unable to control her new chaos magic. If she ever wants to be a pony again, there is only one who can help her learn to control her new magic.

Of course, learning from Discord was never going to be simple. And after a while, being a draconequus doesn't seem so bad anyway....

Based on the concept by Lopoddity

Editing by DB_Explorer
Proofreading by Mac349 (Ch. 1-11), Trippy998, Just A Fabulous Cat (Ch. 1-5), Doctor Candor and skysthelimit (Ch. 1-11).

Once a year, the Night Guards of Canterlot receive a very important shipment, much to the distress of their peers. Flash Sentry has no idea what the fuss is all about.

(Submission for EqD's Friend Off event.)

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)

Eons after the events on Earth, Jon Osterman finds himself exploring the cosmos. In doing so, he finds himself coming across one of his creations. After all, he did say that he was going to make life.

Set in a universe where MLP doesn't exist (the show).

This is a Watchmen x MLP Crossover.

When Twilight returns back to Equestria after her time in the human world, she learns she lost something very important. Two things, in fact. Once you go hands, you never go back… for other appendages.

Thanks to alexmagnet for the help editing!