Reader, in ancient days, the old lords of the world numbered in thousands. Then hundreds. Then even less.
Now, they are found only in tapestries and fanciful ballads.
The creatures are all vanished. All but one.

Rumors say there are more of him, somewhere far away. A young and supposedly gifted mage called Star Swirl, and Heartstrings, a gentle spinster, have joined him on a journey to find the rest.

Featured in The Royal Guard's Fic Spotlight #5
TV Tropes page (that could use more love)

On behalf of the Canterlot University of Electrical Engineering, Princess Celestia sends her star pupil a mysterious contraption she wants her to take for "beta testing".

A mysterious, new invention dubbed the "Xbox 360".

Shenanigans and hilarity will ensue.

Link to TVTropes page: http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/TheElementsOfGaming
Link to story on EqD: http://www.equestriadaily.com/2011/07/story-elements-of-gaming.html

The earth had belonged to the People since time immemorial, until the ponies came to push them out. For centuries, they have hidden in the forest and the hills, slowly losing ground to their enemies.

But now the gods have chosen two young warriors.

The wheel of time turns, as destiny and history clash together.

Fifty years into the future, Sunset Shimmer is Princess Twilight Sparkle's most faithful student. She is smart and eager, but doesn't always think things through. Her life had been perfect, right up to the End of the World.

With a ruined future, Sunset travels into the past to alter the course of history. With only her mentor's cryptic word to go on, Sunset and the Elements of Harmony must solve the riddle of the Dark Regalia and stop the mysterious Vesper Radiance from rising to power. But the further Sunset goes, the more she feels like she's been through it all before.

Is destiny set in stone, or can Sunset shape her own future? Only time will tell.

Featured on Equestria Daily 6/16/13
Gratefully edited by JustAnotherTimeLord, Icarus_Gizmo, Cerulean Voice and Bad_Seed_72

The Sunset of Tropes page!

This story is a sequel to A Stitch in Time

Having discovered the message left for her by Star Swirl the Bearded in the distant past, Twilight once again finds herself caught up in the middle of a struggle against forces far greater than herself. In order to even stand a chance she'll need to travel further and wider than she ever has, and forge some unlikely alliances with old enemies. All to bring down the powers that have manipulated and shaped her entire life, and retake control of her own future.

The conclusion of the Time Loop Trilogy, which began with Hard Reset
Available in Spanish thanks to dgs1993
Series TV Tropes page

After successfully completing another mercenary mission, Deadpool feels that he is living an unfulfilled life. As he flips through his television, he discovers a show called My Little Pony: Friendship is Magic. Deadpool becomes instantly obsessed, and not long after, he starts comparing and contrasting the world he lives in today to the world of Equestria. He suddenly concludes to himself that Equestria would be a better place to live in...

After King Sombra's defeat and the return of the Crystal Empire, Princess Celestia came to the mane six with an offer: to become a manifestation of her will throughout the world, an elite team designed to solve Equestria's most dangerous problems. Warriors and diplomats, Twilight and her friends must leave their homes and their loved ones to ensure the safety of all. This pursuit will push them to new heights, and new depths.

The world is a dangerous place.

On his way to Seoul, Captain Benjamin Franklin "Hawkeye" Pierce comes across an unconscious, hurt Twilight Sparkle, and takes her back to the 4077 to take care of her. There, she meets the odd creatures known as humans, and learns about their chaotic activities, about both their good and bad sides. The 4077th's crew learns about her world as well.

And during it all, they heal each other's hearts, even if they don't mean to.

'John Smith' has settled in Ponyville with his wife and two daughters for many peaceful years. When the TARDIS gets a temporal distress call, Doctor Whooves and his family find themselves lost in time. Now Derpy must contend with not only monsters and maniacs, but the future and past versions of her husband!

Awake and alone, Applejack will find a way to survive.

And here's a TV Tropes page, if you're into that kind of thing.