King Sombra came from an old age, a time where darkness and evil were prevalent across the land. The Princesse's power and influence were weaker in those days, for the land of Equestria was divided amongst many kingdoms of lesser Princesses and Princes. But out of all their ruling neighbors, The Four Shepherds held the most power of all, even threatening Celestia and Luna's kingdom. However, all of that changed when they vanished for a thousand years, ushering in a new era of peace and prosperity. Until that is, when the Crystal Kingdom reappeared, along with one of the Shepherds. King Sombra, however, was thankfully vanquished swiftly, but the following peace of his defeat would not last as long as anypony might think. A new force sets its eyes on the recently coronated Princess Twilight Sparkle, one that seeks to restore a lost heritage and remind the land of who is the true owner of the night. For when one evil is smitten, another appears in its place. And King Sombra was only the first in line.

Set before Season 4

Note: Dark tag is meant for Light Dark

Special thanks to my editor Ladrian for his diligent and superb work. I wish I had him when I first started this story because maybe then the early chapters would have been much better.

Special thanks to Stanku for revisions and prereading this story. It would be at a much worse state had it not been for his detailed opinions to each and every chapter, and letting me know where I can improve.

10/2/2014 : Woah... it's on the featured list... *cue squealing and fist pumping* THANK YOU ALL SO MUCH!

After an unknown accident Twilight Sparkle and Rainbow Dash awake to find themselves sharing the same body! Now they must struggle to hold themselves together as their world is turned upside down. How long can two ponies exist in a single mind? It’s a race against time as they search for answers before it’s too late. When all is said and done, you’ll never look at Twilight Dash the same way again.

This story is a sequel to Veil of Thoughts

After surviving a spell that merged Twilight and Dash into a single being during the story Veil of Thoughts, the two mares are still struggling to get back to as normal a life as they can have. Except, didn’t they used to have more friends? Why is it so hard to remember…

The boundaries of reality are starting to crumble apart. Half dreams haunt their waking world. Memories of another life seep through their mind. What they were is quickly becoming little more than Fragments of Memories.

Friends, family and even enemies will come together to save Twilight Dash before it’s too late and there is nothing left to save.

The long awaited, highly anticipated, sequel to Veil of Thoughts. Don't forget to remember.

Twilight Sparkle. A name known to everypony in all of Equestria. She's saved Equestria multiple times now, and with her and her friends being the Elements of Harmony, as well as being Princess Celestia's "Most Faithful Student", she enjoys a great life.
But what was before that? Follow her on her journey through foalhood, and her times as Celestia's Student.

This is my first fic, so constructive criticism is appreciated very much.
A huge thank you to WhatTheMoo and Knight Of Cerebus for proofreading this fic.
And a huge thank you to TwinTailsInc for allowing me to use his artwork

This story is a sequel to Celestia's Twilight

We all know the story. One thousand years ago Princess Celestia was forced to banish Nightmare Moon to the moon to save all of Equestria, but what if Luna had been hiding something from her sister, scared of how she would react? When Luna had no other choice, she cried out for Celestia and Celestia came. For one thousand years, Luna wondered what happened when Celestia left; now she's finding out...

But is it already too late, or will Luna be able to take the role she had so long dreamed of? The dream of being a mother?

editor Don't Look At My Name Bro! and RK I am lost without you!

Celestia leaves to deal with a foreign crisis, giving her sister a chance to rule alone and become more attached to the modern world. She calls on Twilight Sparkle to advise Luna, hoping her student will be able to draw Luna out of her shell. With two major threats to Equestria already defeated in the past year, it seems like the perfect time to let Luna gain some confidence and experience in the modern world. After all, what are the chances of a third disaster occurring?

Now comes with complimentary tropes.

Twilight Sparkle, Celestia and Luna are transported into a strange alternate Equestria, the Land of Always Summer, where the day lasts forever and a terrible queen rules with an iron hoof.

Feel free to check out or add to the story's TV Tropes page.

That love can be a painful thing is something we both know all too well, sister. But it does not give you the right to throw your happiness away for mine...

I will not ask for your thanks for what I do now. I only ask for your forgiveness, and perhaps a promise to let yourself be happy.

Winner of the Fifth Bimonthly Twilestia is Bestia contest

Enjoy

This story is a sequel to Upheaval: Breaking Point

Following the events of Breaking Point, Twilight Sparkle and her friends discover that Equestria's demise may not come from an enemy invasion, but from within. The Barrier Lands and the Heartland begin the slow and uneasy process of reuniting into a single Equestria, but this long-delayed joining is already in danger at its conception.

With Celestia's power in her grasp and her agents by her side, the wheels of Black Rose's plans for Equestria's future continue to turn. However, her brazen gamble has done more than just bring down a centuries-old barrier. Ancient powers begin to stir: the remnants of a dark period in Equestria's history, the immortal inhabitants of Celestia's homeworld, and a rising tide of darkness coming ever closer.

Equestria is a land of magic and harmony, a peaceful realm ruled by immortal and benevolent monarchs. At what cost is this possible?

Following the discovery of a strange and powerful device, Twilight Sparkle is whisked away to the edges of a land she thought she knew so well. Here, surrounded by ponies whose very existences have been kept secret, she must contend with vicious enemies, hostile allies, and the truth.

Chapters 1-16 edited by KiltedKey