Twilight lives a comfortable, expected life with the security of being surrounded by her mentors and friends. As she grows into a model unicorn, a dangerous being takes hold of the volatile Brood and drives them to war, breaking a long period of peace. After years of preparation for a higher order, Twilight is chosen to ascend beyond that of a typical sorcerer in a mysterious plan to counter the impending conflict.

During her dark, trying mission Twilight will discover a caged soul and unknowingly set them free, gradually acquiring an affinity for the darkness as a result. As she struggles within deepening conflict, she must push on and fight for what she believes in. With manipulation, deceit, and betrayal storming around, will she be able to contain herself and protect those she loves, or will she succumb to the creeping darkness and abandon everything she stands for?

*Warning: Comments may contain spoilers.*

Discord has escaped once again, and Twilight goes to confront him. But when she does, Discord sends Twilight back in time, to when she learned of Nightmare Moon's return. Now, Twilight must try to stop Nightmare Moon once again and stop Discord. But it seems impossible when Equestria is already in chaos.

Deemed a traitor by the God Empress Celestia, Twilight Sparkle must now flee for her life to escape her inevitable execution. In hot pursuit by Celestia's minions, Twilight discovers a cave where an ancient creature has been kept prisoner for over a millennium.

Twilight is stricken with insomnia, causing her to be victim to horrible visions and hallucinations. When she does find herself able to sleep, she is haunted by terrifying nightmares. Meanwhile, all across Equestria, magic users, including the Princesses, are beginning to have trouble harnessing their magical abilities, as it seems that magic itself is "running out"
It's up to Twilight to figure out if these mysterious events are interconnected in any way, and to solve the problem of the diminishing magic before it's too late!

On the night of her return from exile Nightmare Moon comes across resistance as she had expected. However she had a backup plan on hoof for just such a predicament, tearing off a small fraction of her soul and attaching it to the bearer of the element of magic. Now she must play the long game to ensure that she can obtain the loyalty of her new host and once more rise to power over Equestria.

Cover art thanks to Tonto the trotter.

Twilight is invited to Canterlot to compete with some of the greatest magicians in the world for the Moonstone Cup, a prestigious award for the most powerful and skillful magicians, unicorn and otherwise. Can she win? What sort of competition will she face?

Awesome cover image was taken from NoOneBahtim

Subject Delta, an Alpha Series Big Daddy, has been through a lot in his life. But this is his last stand, he and his Daughter Eleanor are going to escape from Rapture. The Pairbonding destroyed, his body tired from all the fighting ... Subject Delta won't live to see the world beyond Rapture. The ending coming near, he finds himself escaping Rapture ... to only awake in a stranger place. Will Equestria be able to handle Subject Delta?

--Crossover with BioShock 2--

Author's Note: First, criticism is highly appreciated. Second, this isn't my first fanfic rodeo, but it's the first time in English. Errors will ensue, so feel free to correct me! Third, I hope you enjoy the story!

Copyright: My Little Pony: Friendship is Magic (Hasbro), BioShock 2 (2K Games), Cover Image (The BioShock Wiki).

Tags: Crossover, Alternate Universe, Human, Dark. --Will be updated--

Characters: Subject Delta, Eleanor Lamb, Sofia Lamb, The Family, Twilight Sparkle, Spike, Rarity, Applejack, Rainbow Dash, Fluttershy, Pinkie Pie, Princess Celestia, Princess Luna, Augustus Sinclair, Yi Suchong, Andrew Ryan, Shadow Stalker. --Will be updated--

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.

After failing to stop Nightmare Moon in the ancient castle of the pony sisters, Twilight Sparkle is left with a scar that will permanently change the rest of her natural born life. As Twilight recovers from her ordeal, she finds that she is left with a difficult choice. Either live her life as a lie or sacrifice her innocence to protect the ones she loves. The path before her is set and she must now walk it alone. The sands of time continues ever onward, with everyone already trapped in its muddy depths. The sun will rise and the sun will fall. Waiting for its call, Death awaits for all.

Tags, rating, and characters can change.

Art created by:
http://cuteskitty.deviantart.com (top)
http://ventious.deviantart.com (bottom)

I just put the two together

The Elements of Harmony are defeated and Nightmare Moon stands on Equestria's throne as their new Queen. Is Equestria doomed to suffer through night time eternal or will they be... perfectly fine? Twilight finds her new job as slave or "personal assistant" to her new ruler to be a bit maddening. But is this evil sarcastic queen really as bad as she originally believed? And just how many others are diabolical enough to cash in on the change in staff? Can Nightmare truly run a peaceful Equestria? Let me just answer all these questions right here in the description...