"Dear Princess Celestia,
It's been a long time since i last saw you. Perhaps you could tell me why you locked me up?"

and then, Celestia visits.
---
now with a reading by Sockless/TheBenBlast: Trapped Reading
Youtube Version

The Pony of Shadows. For generations, this creature of myth has terrified every pony who heard about it, and it became known as the source of all the darkness, cruelty and wickedness in the world, the wellspring from which evil flowed. Twilight, who has led her friends against many foes in the past, seeks out this ancient enemy of her people, to vanquish it once and for all.

But when she finds it, she and her friends instead discover a different story. One the young Princess would never have expected.

Sometimes, evil can hide in the most innocent things... but what happens when the inner good is covered by an appearance of evil?

To the average observer, Sunset Shimmer made a full one-eighty when she was hit by the Rainbow Blast back when she turned into a She-Demon. However, she didn't just suddenly turn good or realize her mistakes. Truth be told, she died back then. She was welcomed into the cold embrace of death.
In that darkness, she found him. The one they call Sombra, there to welcome her to her doom. Surely a bright mind like her's knew the Price of Evil.

Sunset Shimmer returns to reclaim her place as Celestia's student, how you ask? by Stealing Twilight's body! only... things don't exactly go as planned.

Twilight discovers Sunset sneaking around her library trying to catch her off guard, attempting the mind swap spell Sunset is met by Twilight with a counterspell, however the incredible magical ability of the two unicorns mutates the spells, crossing them and warping it causing a very unusual effect.

now the two must work closer then either of them is comfortable with to reverse it, all the while the two of them fighting for control.

Princess Luna must flee to the Griffon Kingdom, away from the fire that burns at the heart of the new Equestrian order.

here follows the account of Princess Luna, Princess of Equestria, Keeper of Harmony, and Defender of the Faith.

This Story undergoing Rewrite

A freak accident leaves Princess Twilight Sparkle blind. With magic unable to help her see again she is resigned to her fate as a shadow of her former self.

Sadness and depression strike hard and fast nearly every day. But luckily for the disable princess, she may stumble across an organisation that could help her to see again. But miracles don't come freely, fortunately, she may have a guardian watching over her.

:: ORIGINAL VERSION FEATURED 9/6/2014::

This is a new age of Equestria. An age where darkness rules. And where one certain princess will stop at nothing to end it...even if it means destroying the ones she cares about the most.

Due to a mishap while researching an ancient spell book Twilight unintentionally awakens a timeless horror. At the same time a strange bipedal creature wanders into Ponyville, a creature Twilight begins to question is even totally sane.

With the help of Discord, can Twilight and this strange crazed alien defend Equestria from the danger it now faces?

Equestria is united in friendship under the Eternal Twilight and her five Envoys of Harmony. But all is not honey and oats. There are holes in the narrative, which the Stewards of Discord, led by the cold yet tenacious Dawn Sunshine Burns, are determined to illuminate, even if it means unleashing an unstoppable power that threatens to destroy friendship forever.