Even the tiniest change can alter the future in ways you can't imagine.

The battle with Lord Tirek did not end the way it was supposed to. The centaur was still sent back to Tartarus as he should have been and Equestria and all of its' ponies were saved, but thanks to one final act of defiance, Twilight vanished without a trace not long afterwards.

One month after her disappearance, Twilight has returned to Equestria, but not in a state anypony was expecting her to. Now they're all filled with questions about what has happened to her, but what tale does she have to share with them? What is she willing and unwilling to tell them?

Can a battered phoenix still rise from the ashes?

When Twilight accepts Cheerilee's request for her to substitute teach, she quickly realizes the topic is "the birds and the bees". So, not wanting to let down her students, Twilight attempts to teach the subject to the best of her ability.

Sex tag is only there because the story dances delicately around the topic.

Don't want to read? Check out Clever Hooves' audio reading here!

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!)

Sunset Shimmer fled from Equestria in search of the destiny that Celestia sought to deny to her. She dreamed of finding great glory and power in a strange new world. But she emerged on the other side of the mirror in a harsh cruel world beset by demons and troubled by division, conflict and racial animus: the world of Remnant.

Now, years later, Sunset has completed her studies at Canterlot Combat School and is ready to attend Beacon Academy. She hopes that in the more progressive Kingdom of Vale her appearance as a pony faunus will not be held against her the way it was in Atlas, and she can rise as high as her talents permit and seize with both hands the destiny she still yearns for.

Sunset finds herself assigned to lead three fellow freshman at the Huntsman Academy: Jaune Arc, who dreams of becoming a hero elevated above all others; Pyrrha Nikos, a peerless warrior who has everything that Sunset wants and hates everything about it; and Ruby Rose, a simpler and more honest soul who simply wants to save as many people as she can, and who might just light the way to their salvation.

Together they are Team SAPR, and together they are plunged into a world of mysteries, magic, allies and enemies, robot girls and Atlasian black ops experiments. It won't be easy, but if they can work together, teach Jaune how to fight and maybe learn to get along as friends along the way, then they might just save the world.

Original Cover Art by Mix-Up
Current Cover Art by MRK50
Now with a TV Tropes page

Also with a Discord Server