Daring Do cannot believe her luck when she is asked to help explore the most ancient tomb known to ponykind. But terrible danger awaits her, for beneath the earth rests something beyond equine understanding.

Warning: comments contain ending spoilers.

TVTropes page.
Alternate ending by Duplex Fields.
Archived in the Pony Fiction Vault.
Reviews:
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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!)

It had been hard enough, being one of the first. With the walls dropped, leaving her nation, her herd, traveling to Japan and trying to exist among so many strangers... every day had been a challenge. But she'd tried. Day by day, hoofstep by hoofstep, she'd felt she was finding her place in the human world.

But now there are no humans. No other demis or liminals. Nothing to anchor her. She exists among tiny horses and the scent of their fear, or at least what little of it drifts into her cell.

For nopony can look at a centaur and see anything but a monster.

(Now with author Patreon and Ko-Fi pages -- and the TVTropes page just went live.)

Cover art by Harwick. Please contact him for commission rates & prints.

Trigger warning: character interpretation.

Only a few hours after she learned of the Griffon Empire's invasion, Princess Celestia surrendered herself to the griffon army and asked for an audience with the Griffon Emperor.

The Emperor thinks she's here to negotiate Equestria's surrender.

He's wrong.

Spanish Translation
Polish Translation

Chrysalis kidnaps Rainbow Dash and holds her for ransom.

This same Rainbow Dash also happens to be engaged to the immensely powerful Alicorn Princess Twilight Sparkle.

Chrysalis is not a very smart changeling.

[Featured on EQD 21/4/2014] [Now on TVTropes]

When Luna gifts Twilight the town of Ponyville and its surrounding countryside as her demesne she's initially confused. Then, after double checking her dictionary, more than a little concerned.

All her friends are, legally, her possessions. The town that took her in is her plaything, if she so wishes. She has been given responsibility.

Can Twilight's vision for a modern renaissance outrun the harsh realities of the shadowy figures pulling strings behind the scenes, nobles jockeying for her attention, and an irritatingly metaphorical love triangle?

Special thanks to the insatiable Blue_Paladin42, the incorrigible Maskedferret, the intuitive Southpaw and the indestructible newbiedoodle for all their hard work, past, present and future.

Mark Wells was a klutz, but even he could not imagine stumbling into a mirror that he had just bought at an antique store and ending up in a world of colorful equines, not to mention gaining hooves and wings at the same time. And whoever heard of green fur on a horse? Perhaps the great and powerful Princess that the guard was taking him to would have some answers because he sure didn't!

An alternative version of canon events with humorous twists. Written in collaboration with Airy Words.

Cover art by Mix-up and their DeviantArt account is Amalgamzaku.

Book One: Chapters 1–33
Book Two: "Further Off The Mark": Chapters 34–69
Book Three: "On The Mark": Chapters 70–100

Sex tag added as of chapter 32 but it's mostly due to talk. Actual sex takes place "off camera".