Every night when Pinkie Pie goes to bed, Pinkamina rises. Using the cryptic powers of the Pinkie Sense, she deciphers the clues and goes out to prevent the deaths of others. Meanwhile, the Stallion Lickity Split is developing feelings for Pinkie's darker half, and the Royal Sisters do NOT like Pinkamina messing with fate.

Isolated from her friends and taken prisoner in the middle of a war, Twilight must deal with the very real dangers of being percieved as an enemy as well as the nightmares of her arrival on 'Earth'. Can she overcome her own fears and the fears of her captors? Will the wayward unicorn's assistance be a boon or a curse to the 'humans?' Most importantly, will she ever find her way home?

"In short, it's a story of friendship and plasma rifles, with the emphasis on the friendship. The characters are well written, the XCOM setting is fleshed out very well, and the story is compelling. If you love XCOM, you'll love the story, but even if you've never heard of it, it's more than worth giving the first 3 chapters a read.

There's excellent action later on, but the real strength lies in the collision between the friendly and naive world of Twilight Sparkle and the desperate world of humans fighting a losing war for survival and willing to do anything to turn the tide."

--Arzoo

(XCOM/FiM crossover)
(Cover art commissioned by a friend and created by the magnificent FoxInShadow!)
(Original cover art by the amazing Carnelian can be viewed here!)
(Gore tag for blood and some violence)
(Many thanks to the studius OminousTen, Arzoo, xXFluttershyForeverXx and finally Setokaiva for giving my rambles a once-over)
(Now with it's own TV Tropes page! Get to tropin' folks!)

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

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

This story is a sequel to Like Shattered Glass

When you take the blame, you'll take the pain. Scootaloo took the blame.

Rated for scenes of abuse and mild language.

...

UPDATED 12/22/2014.

After one of Sweetie Belle's clumsy mistakes ends up destroying one of her sister's entire fashion lines, Rarity is finally sent over the edge. But after a terrible accident lays Sweetie Belle at the foot of death's door, Rarity is faced not only with losing her sister, but also with the reality that she may never be able to apologize for what she did.

Rated T for safety.

Sequel! Hoof Covers Bruise

This is 100% Approved by Twilight's Library!

This story is a sequel to Pan Flash

First Take isn't Rarity -- but she does play her on TV.

This story is a sequel to Butter Up

Barnstormer isn't Rainbow Dash -- but she does play her on TV.

Mole Cricket, a changeling, faces the greatest challenge of his life so far: Convincing all four princesses that he deserves a chance at earning citizenship in Equestria. Can he convince Twilight Sparkle, Celestia, Luna, and Cadance that he can be a contributing member to society?

An Interquel to the story "Your Fangs Are Showing", this takes place between chapters 3 and 4.