There is a secret in Equestria. A secret the newly crowned Princess Twilight Sparkle doesn’t dare to believe. Like puppeteers pulling on marionettes, they have influenced Equestria for better and worse since the fall of Discord. So far they have been benevolent, but their potential for evil is vast. What’s worse, she doesn’t know their name. She doesn’t know their mission. All she knows for certain is one thing.

That they all seem to be zebra.

This story is a sequel to Stardust

When Equestria’s newest member of royalty asks for aid to be offered to her friends from abroad, the best and the brightest volunteer to serve. Captain Steel Song of the Dusk Guard are immediately mobilized to help XCOM defend their world from the enemies that besiege them. However, their first joint operation with the humans takes a turn for the worse and they quickly find themselves fighting for their lives against the full force of the monsters that threaten Earth.

(Stardust/Dusk Guard crossover)
(Coverart provided by a friend of Viking ZX!)
(While familiarity with both stories isn’t required, it is recommended)
(Many thanks to Arzoo for pre-reading!)
(All screenshots can be found at XCOM.wikia.com)
(Featured on 3/13/2013. Thanks everyone!)
(Now has it's own section on TVTropes as part of the Stardust series!)

This story is a sequel to The Definition of Strength

It's Nova's first official day off, and he's decided to spend it in one place he knows he can relax: the Canterlot Bazaar, where anything and everything is for sale from all across the globe. But when he runs into a pony he didn't expect to see again, can he face who he once was? Or are old habits best left forgotten?

Third of the Side Stories to The Dusk Guard: Rise. Familiarity with Rise is not required per se, but recommended.
Side Stories so far:
Carry On
The Definition of Strength
Old Habits
Emoticon
Remembrance
Trust

The Saga has a TV Tropes page!
"This is 100% Approved by Twilight's Library!"
Added to Twilight's Library 4/9/2014
Special Thanks to Sonorus, Jorlem, Sinister Voice, and Bronze Aegis for their help pre-reading, editing and getting a summary together.
Art by NabderbD

"... at the forefront of our fandom’s writing scene ... Masterpiece." —PCaRG
"... really enjoyable ..." —City of Doors
"...worthy of high praise." —PaulAsaran
"Lots of wonderful world-building, great action, well-developed characters and an engaging story." —Hoopy McGee

Steel Song is a lot of things. Earth pony. Uncle. Professional bodyguard.

Retired.

So when he receives a mysterious package from Princess Luna a few weeks after the changeling invasion, he's understandably apprehensive. More-so when he presents himself before the Royal Diarchs to find that not only do they desire him to come out of retirement, but to take command of a most unusual position...

A position that may have more significance than any of them suspect. Because strange thefts are occurring on the Equestrian Railway, thefts that nopony can explain. Thefts that may have far more sinister intentions than their seemingly innocent nature may convey.

Intentions sinister enough to shift the balance of power in Equestria forever.

Book I of The Dusk Guard Saga.
Epic Fantasy
Has a collection of Side Stories as well, the first of which is here.
Now with a TV Tropes page!
"This is 100% Approved by Twilight's Library!"
Added to Twilight's Library 11/26/2013
Added to Canterlot's Finest 12/01/2013

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!)

When Rainbow Dash finds herself lost in a new and unfamiliar village, she reaches out to a certain lavender-hued stranger for help. But to Twilight Sparkle, Rainbow Dash is no stranger; at least until she notice her strange new voice, a lack of wings, and a fondness of the word ‘darling’. Intrigued by the uncanny looks to one of her best friends, she decides to lend the newcomer a helping hoof, but things go from weird to weirder when Pinkie Pie happily announces that she too has met her lookalike. Twilight Sparkle and her friends take it upon themselves to find out the truth behind this mystery: who are these doppelgangers? Could there really be another Ponyville out there? And what does it all have to do with Discord’s lost legacy?

Cover art by AireDaleDogz (http://airedaledogz.deviantart.com/)

When Fluttershy received her certification as a fog specialist, she only wanted a plausible excuse to write off the expenses associated with her ground-based house on her taxes. However, when an accident in Cloudsdale sends a blanket of industrial-grade clouds rolling towards Ponyville, Fluttershy suddenly finds herself in charge of coordinating the response, mostly because she's the only fog specialist in the area. Can our heroine step up to the challenge at hoof, or will she risk facing the wrath of the Equestrian Revenue Service?

Artwork by Page Turner. Now with a TVTropes page!

[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.

Bon Bon's voice is funny, and that's about all that anypony who meets her notices, as her marefriend Lyra soon steals the spotlight with her explosive personality, strange obsessions, and curious beliefs. And why not? Bon Bon is, after all, a perfectly ordinary, boring pony in every way but two: her voice, and the carefully kept secret that she isn't really a pony.

(Edit:) Now with an annotated version, courtesy of the incomparable Shoggoth Lord!

Now Featured on Equestria Daily!
TV Tropes and a group of its own.
Audio version
( EPUB / MOBI )
Three Nights in Manehattan, a sequel
Hardcover Print-on-Demand Order Page

As a child, Daphne knew of a world where magic lived, where an immortal princess reigned over a beautiful kingdom, and longed to journey there beside Leit Motif, the filly she'd grown to love in the woods behind her home. But one day, when she needed her most, Leit Motif was gone, and she never came back to show her the way. As she grew, she put aside her childish dreams, and taught herself to believe the lie.
When forces beyond her knowing take her sister Amelia, though, she discovers that her childhood fancies were entirely too real, and is thrust into a journey that will take her back to that land she longed for, back to the childhood friend she'd abandoned, and to worlds she'd only dreamed of.

Interview with Pre-Reader Amacita
PresentPerfect's Review