A flip of a coin. A twist of fate.

Twilight Sparkle, younger sister of Princess Celestia's personal student, Shining Armor, grew up listening to her brother's bygone dreams of joining the elite of the elite: The Royal Guard.

Now, fresh out of the Academy, this young mare is ready to prove herself equal to the deeds of the great soldiers she read about as a filly. Too bad the princess she ends up protecting isn't Celestia.

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!)

This story is a sequel to The Order

Despite receiving a harsh reprimand from Captain Ironhoof for his "little stunt," Flash Sentry still struggles with his forbidden feelings for Princess Twilight Sparkle. Maintaining a professional stance while adhering to the law of the land proves an even more difficult task, especially when his one act of defiance only seems to awaken the seething rebellion within him.

When Flash is assigned to escort Twilight to the Crystal Empire at Princess Celestia's insistence, tensions on all sides only seem to escalate.

Full list of character tags: Princess Celestia, Princess Luna, Princess Cadence, Twilight Sparkle, Flash Sentry, Shining Armor, Discord, Prince Blueblood, OC, Other.

Thanks to Sir Rustbucket and Holo for editing.

Now with a TVTropes page! A huge thanks and tons of Doge GIFs to Poptard for creating it!

Now Featured on Equestria Daily!

Rated Teen for some language, mild violence, and thematic elements. Sex tag is for sexual references in dialogue and implied sexual situations.

This story is a sequel to Without a Hive

It is a time of change for Equestria. A small but slowly growing number of changelings have made the kingdom their home, living openly with ponies. Many ponies welcome them in friendship. Others are concerned by the strange and unusual creatures that disrupt the traditional life of Equestria. Yet others worry that such open acceptance leaves Equestria vulnerable to less well-intentioned changelings. And some still fear the insectoid creatures, memories of invasions--and more personal attacks--still strong in their minds.

Sky, Nictis, and all the other changelings of Equestria would love nothing more than to live in peace, but such changes rarely come easily. But in proper changeling fashion, they are determined to endure, and this time they are not alone. Instead of the shelter of disguises and lies, they are strengthened by the friendship of the ponies that accept them, ready to stand tall in the face of an uncertain future.

For nobody, from the new Equestrian changelings to the Princesses themselves, knows how Queen Chrysalis is going to respond...

Book cover art by viwrastupr

Before her descent into madness and her rebellion as Nightmare Moon, Luna lived entire lifetimes as a mortal and traveller amongst the ponies of Equestria.

Restored to her true self, Luna knows she must return to her cyclic life to remain whole. As preparation she chooses to reacquaint herself with the lives of her subjects in this modern age, and in the guise of Sable Moonshine, unicorn scholar and distant friend of Twilight Sparkle, she travels to Ponyville to spend time with Twilight's companions. Despite the 'exciting' month of astronomical observation and scientific research planned by Twilight, Luna nevertheless finds time to work a day at Sweet Apple Acres. And then another.

And another.

Applejack, meanwhile, is pleasantly surprised by Sable's dedication and enthusiasm for hard work. She's less pleasantly surprised by Sable's enthusiasm for Applejack.

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2