"And here you'll see the statue of the Lord of Chaos, Discord, imprisoned in stone..."

A group of students from the School for Gifted Unicorns are given a chance to visit Celestia's royal garden and a curious filly decides to ask about a statue that's in their tour, where they all hear the story of how the spirit of chaos fell into a stone imprisonment for the third and final time.

Art by: Kabudragon

They really believe a few shiny rocks can stop me? Me? The Spirit of Chaos and Disharmony? Oh, that is hilarious! HA HA HA HA HA HA!

Ha.

Why can't I move?

Oh cotton candy mixed with onions up a dancing giraffe...

This story is a sequel to Stardust

Times are changing for Equestria as Twilight’s return brings with it news of people and cultures from beyond the peaceful world everypony knows. Aid and volunteers are freely offered to help the besieged humans of Earth because every Equestrian knows that’s what good friends do. Unfortunately, making friends can also have the unintended consequence of making enemies.

When the monsters besieging the humans strike at Equestria with a level of brutality not seen in over a thousand years, the cry for help is sent to all the kingdoms of the world. Honored allies step forth to fulfill ancient treaties and oaths. Enemies, old and new, bury their grievances. An alliance never before seen in Equestria will be created to combat the monsters from the void.

And because of these events, a grim but welcome sibling to the XCOM project is born.

(XCOM/FiM Crossover)
(Sequel to Stardust, which I recommend reading before starting this. Fortitude Amicitia and Broken aren't required reading but are supplemental to the storyline)
(Gore tag for blood and violence)
(Alternate Universe tag because of the divergence from canon that Stardust has caused)
(Uses elements of Season 4)
(Coverart produced by the amazing Carnelian!)
(Many thanks to Arzoo, BradTheBrony, Vandenbz and Setokaiva for prereading!)
(As of 03/07/2016, the prereading team consists of Arzoo, BradTheBrony, Noble Cause and Metallusionsismagic!)
(Complete with it's own TVTropes page as part of the Stardust continuity. Could use some updating!)
(Character tags will be added as chapters are added!)
(Featured 5/12/2014! Thanks folks!)
(Possible spoilers in the comments! BEWARE!)

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!)

Imagine my surprise when I see a winged unicorn in my kitchen that claims she's my mother.

Imagine her surprise when I threw my coffee mug at her.

Imagine my Dad's surprise when I was banished to the end of Time.

Okay, the last part didn't happen, Tempora is actually really nice, but you get what I mean.

Just roll with it, I guess?

Based on an idea by Rainbow Dragon!

Edited mainly by FlameSwordedLink and now Grand Inquisitor.

Tag updated.

Future Chronicles now HERE
Kayla-verse linked here and in the story.

Mis-communication has started many a war, but in this case maybe calling it a war was too generous.

The "war" is over, Twilight has successfully orchestrated a bloodless end to the Griffons' aggression, but only now does she realize that there is more to winning than she had first assumed, especially against a nation that holds war as a central part of their culture...

Now Twilight must deal with the aftermath while facing a challenge she never anticipated: being seen as a conqueror.

This can be read alone, but I recommend reading the letter that started it all for a chuckle and a little exposition. This series of expositional one-shots can also give some additional world-building.

After a concert in Manehattan, Octavia overhears somepony calling her a fillyfooler and gives a heartfelt, somewhat drunk, curse-filled speech regarding it.

Inspired by a brief mention of the event in "Tools" by Samey90.

Tons of swearing, by the way.

And in case your eyes are allergic to letters, there is this fabulous Youtube reading by Octavia Winged T. Spears: https://www.youtube.com/watch?v=URysKo0Ymk0

How would things be different if Twilight had never made it to Ponyville? Twilight Sparkle finds out just how different things could be when she is forced to travel to her own past while chasing down a mystery; a plot to erase Princess Twilight Sparkle from history.

Landing in a time just weeks after the one thousandth Summer Sun Celebration, she finds a world shrouded in an eternal night, where the Elements of Harmony were never recovered. Can she fix the things that should have, but didn't happen? Or is this Equestria destined to head down a different path?

Chinese Translation by Hell Organist

This is a fic based on the Time Loop Files, the format of which was first codified by Innortal on fanfiction.net.
Here's a brief guide.
The basic idea is, one character (the Anchor, usually the main character of a fictional setting) is looping back to the very first moments of their parent series every time either they die or some kind of time limit expires. They of course end up monumentally stir crazy given enough time.
Eventually others start to loop as well.
The reset is not always perfect. Sometimes a loop's history will be different to the "prime" loop, or canonical plot.
"Crossover" or "Fusion" loops also occur, randomly. These can involve the home loopers having a guest, or the anchor for one universe spending time in another, or replacements of one character by another.
Vacation Loops are where the Anchor (or others) decide/s "buck it" and lets off steam by doing whatever comes to mind. There's little or no attempt to maintain the original timeline.

In addition, and particularly more recently, it should be known that this story has a collaborative element to it - people may submit loop ideas or loops, ideally at the Spacebattles thread (a link to the current version of which is on the Trope page), and they may become included.

There's two page image options, thanks to Filraen - the current page image has been edited by the original creator from this work of theirs.. The other one is here:
http://hourglass-vectors.deviantart.com/art/MLP-Loops-466030169