Celestia is not invincible. Strong, yes. Ageless, assuredly. Magical, undoubtedly. But not invincible.

The Princess of the Day has been attacked, and she did not escape unscathed.

While Luna fights against the mortal fear gripping her subjects in the wake of the assassination attempt, the enemy runs free. Twilight Sparkle must assemble a team to bring the pony to justice. Few ponies can be trusted, and fewer still can be expected to succeed.

But the kingdom has heroes: The Knights of Harmony. Ponies who have stood against evil and won, who fight to make Equestria a safer place. Each is an expert in their particular field, masters of their trades, but they have yet to work together.

An adventurer past her prime.

A tinkerer with too much time on his hooves.

A spy whose primary instinct is to lie.

A dishonored soldier with an axe to grind.

As they delve into the origins of the assassin, they find that Equestrian history still has secrets long buried. Can the knights come together as a team before she finds her next mark?

Rainbow Dash has dreamed of being a Wonderbolt for as long as she can remember. She's trained herself every single day to be better at her craft so she may one day join the team. But, when her dreams finally seem achievable and she is just about to reach out and grab them, a rumor breaks loose, leading to her goals slipping out of her grasp. Hopes and spirit gone, she must clear her name or forever have cheated dreams.

My entry for the Twidash Competition, "Framed".
EDIT: I have received third place in the competition this was entered in!

New cover art generoulsy provided by Angelic Flight over on DA. Go check her stuff out!

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!)

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!)

On the day of the Friendship Games, the veil between two worlds is pierced. The magic of Equestria seeps through the barrier to permeate the world of humanity. Entities begin to come into existence. Lore and legend are gaining flesh, bone, and blood, yielding things both wondrous and horrible. Magic is powerful, but a limited resource. If the world at large discovers its existence, Equestria will become a target.

Thus, seven friends agree to keep the secret, but some things will not be hidden away.

When Twilight Sparkle was just a kid, her best friend was a girl named Sunset Shimmer. Though their friendship had a bit of a rocky start, they quickly became inseparable, no matter how much everyone thought of them as ‘weird’. They were there for each other.

Were.

Years after the tragic accident that tore them apart, Twilight is determined to move on from her loss, and she sets off on an independent research project to investigate the strange happenings at Canterlot High. Little does she know that she will soon come face to face with what appears to be a literal ghost from her past.

Coverart by Kare-Valgon. Chapter illustrations by Zorbitas.

Edited and Pre-read by Dubs Rewatcher, r5h, and Kalan.

Takes place after Rainbow Rocks, but was written before Friendship Games and does not take it into account.

Chinese translation

Print copies now available.

This story is a sequel to Into The Depths

The horrors of the catacombs have turned to distant memories for Celestia, Twilight, and Luna. Discord’s change of heart and Twilight’s coronation have helped to ease and erase the mental scars from that harrowing night. The three princesses can even smile and laugh as Nightmare Night moves into full swing.

Yet, it should never be forgotten that those who have been touched by Tirek are forever within his grasp.

This story is a sequel to A Moment in the Sun

Sunset Shimmer is on the run. It's been six months since she left her life as Princess Celestia's student behind, but she can't escape her own past. Her parents are offering a reward for her safe return home, and Celestia's agents are watching her every step. She might have gotten out of Canterlot, but the runaway student is still a long way from freedom. Especially since her education with the Princess of Equestria didn’t cover things like how to make a living wage with her magical skills.

However, there might still be one place where she can escape all of them. The infamous island nation of Freeport has long had a reputation as a haven for pirates, criminals, and exiles, but there's no better place in the world for somepony who wants to disappear. The only question is whether Sunset will live long enough to pull it off.

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

This story is a sequel to The Dresden Fillies: Strange Friends

Almost a year has gone by for Harry Dresden since he left Equestria. He'd have written, but between saving his newly discovered brother and destroying a scourge of vampires he's been a little busy. Then out of the blue he receives a strange letter from Twilight asking him to return. With no cases at the moment he eagerly accepts, but his friends aren't the only ponies expecting him. There's been a lot of rumors since his last visit and some ponies aren't too keen on seeing him come back.

A sequel to The Dresden Fillies: Strange Friends.