This story is a sequel to The Celestia Code

When the monsters created by the dark crystal engine escape their prison, it's up to Princess Twilight Sparkle to deal with them. She gets help and advice from Princess Luna, but things don't go as planned. In fact, when a pony who relies on logic and rationality tries to navigate the stormy seas of emotional entanglement while simultaneously saving Equestria from a horde of evil creatures intent on destroying everything they encounter, nothing goes as planned.
AUDIOBOOK by VisualPony
WARNING: Major spoilers in the comments.

Book 2 of the Alicorn Adventure series.

Goodreads Page
100% Approved by Twilight's Library!

The Badass Twilight tag applies more than ever, but please note the new tags.

This story is a fairly direct continuation of The Celestia Code. You might be able to follow it without having read The Celestia Code first, but it's better if you do.

The sequel is here: The Twilight Enigma

Most excellent pre-reading/editing done by the erudite AcademicPony and the dapper statoose!

Princess Cadence and Princess Twilight Sparkle are called to Canterlot to take over two very important responsibilities: The Sun and the Moon

Oh, and just one additional thing.

Placed 8th in the Writeoff.me event for Out of Time

(Now on Equestria Daily Cover Source - MLP Wiki site )

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

"For Your Eyes Only" is a horror story written in first person narrative through a letter. It details an expedition into the Everfree forest, and the terror that lies in wait. I won't give away too many details here, as I attempted to keep information in short supply throughout the story. Giving stuff up here would ruin the mood.

There is a lot of strong language in this story, as well as pony-based death. Keep the foals away from this one.

Most of the characters in this story are based in some way on people I've worked with in the Air Force. Though the story is written from the perspective of an Army Officer, I actually have little experience working with the Army, so some of my terminology will be off. I ended up using terms and phrases from all branches, as I've ended up working with everybody over the years in some fashion.

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 Stardust

Twilight has finally returned home from the harrowing challenge that Discord set upon her, and the residents of Ponyville and the Elements especially look forward to having their dear friend returned to them.

Twilight, however, has changed. Still suffering from her injuries, almost incapable of using magic and haunted by the memories of her time on Earth, she becomes increasingly withdrawn from those who were closest to her. Will her frustration at her current state and her friends inability to understand her experiences cost her what she valued most before Discord's bet?

(Sequel to Stardust, familiarity with this is recommended!)
(Proofread by Arzoo!)
(Coverart commission drawn by the amazing KairaAnix!)
(Crossover with XCOM: Enemy Within, though the crossover and human elements are minimal)
(Featured 4/28/2014, thanks folks!)

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!)

Waking up in a strange and dangerous place, Twilight, Rainbow Dash, Fluttershy, Applejack, Pinkie Pie, and Rarity must work together to find a way to escape.

This story is a sequel to Distorted Fate

After enduring the task of adapting to being a filly and helping to stop a potential disaster from occurring, one would think that things are finally turning around for me. Sadly... fate will never be that nice to me. Now I have deal with ponies knowing that I was originally an alien, Twilight's desire to learn everything I know, as well as training a team of ponies to handle any interdimensional issues that could come to Equus thanks to Celestia's recklessness. My life just keeps getting worse.

Oh, and everypony said I'm also going to have to go through something else, but I didn't understand the word. Just give me a moment as I look it up. I think it started with a p.

Note: It is recommended to read Distorted Fate first. Also may contain some gore.
Updates Tuesdays and Fridays.

Art: WildSoulWS
Editors: FourponyChapters I-XXXV), Hyari(Chapters I-XIV) PersonalGamer (Chapters XXIX and onward) RockstarRaccoon (Chapters XXXVIII and onward), PinkieThePrankster (Chapters Chapter LVIII and onward)

I was just hoping to get this last job done, always getting sent to this dimension or that, always doing the interests of others. Unfortunately, everyone's luck eventually runs out, and it looks like mine has ran out as well. Now somehow I got stuck in this place, in a foreign body, and things just keeps getting worse for me. What did I do to deserve this?
Note: This is not a HiE story.
Editors: Discord Kantus (Chapters I-XLII), Hyari (Chapters XXXIV and onward), Fourpony
Art: AlicornParty