In the grim darkness of the 41 millennium, there is only war. War, and Friendship.

When the Ruinous Powers of the Warhammer 40,000 universe take an intrest in Equestria, you know nothing good is going to come out of it. When Celestia is struck down by an agent of Tzeentch, the land of Equestria will soon find itself locked in combat with it's own denizens as Chaos itself begins to corrupt the land. Discord was difficult enough, but now our little ponies will have to face four gods of chaos at the same time.

A (Comedic/Dark/Adventurous) Warhammer 40,000 and Friendship is Magic crossover. Here be fanon, canon, and headcanon of both series.

Octavia is a high-class pony. Fine alcohol is her wont, and uncouthness her intense chagrin. Such is her surprise to find herself lumbered with an insufferable oaf of a DJ pony. However, sometimes these situations work themselves into a satisfactory ultimatum all the same.

Be Awed and Amazed by the tale of Sweetie Belle as she traverses the multiverse in search of her lost mentor and friend, Twilight Sparkle! Will she find her in post-apocalyptic Equestria? Or maybe in a strange world where everypony is the wrong gender? Or even where a Pony claims to be a human? Read as she journeys through very familiar worlds you might have read about... if you dare!

At this point in time all the main worlds to be visited have already been chosen. Thank you all for the suggestions, and I hope you enjoy the surprises!

Here's the official TSC:F Music Intro: The Sweetie Chronicles: Fragments

WDTP: S2/3-CE
You can also visit the TV Tropes Page which has spoilers!

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

Twilight is an intelligent mare, and always has something to say. But when a group of bizarre creatures shows up at her library offering life long service and devotion, for once she's at a loss for words. Which is too bad, because she'd really love to ask: what's a human and why are they so weird?

Story Image by: Megan Lara

For almost a thousand years, the immortal Nightmare Moon has reigned over Equestria as Empress. To the average pony, Nightmare Moon is an overarching enigma whose rule is absolute and whose wrath is terrible. But to Twilight Sparkle, who as an orphan has never known her parents, the Empress is something else entirely. When the young unicorn is brought under the royal wing as an apprentice, she learns a great deal more about the supposed tyrant than she ever knew. But as Twilight is introduced to life with her new mentor, she is thrust into a world of political intrigue, conspiracies and secrets. Secrets that were never meant to be revealed. As allies and enemies plot against the very peace of the nation, will Twilight fall prey to the perils of her new position? Or will she prosper and find in Nightmare Moon the mother she never had?

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My eternal gratitude to my editor, LordOfTheWrongs, without whom Night's Favoured Child would not be the story it is today.

Now with added TVtropes!

If this transmission reaches you, it means I, one of your battle units, am still functional. Little else seems to have survived the transfer other than myself.

I am currently manipulating a pony here called Twilight Sparkle, to open a rift for us. If my plan succeeds you will find me at coordinates (113, 117) and a pony to study at (111, 106).

Regardless you have an ally in this putrid land of sunshine and smiles. Soon Earth will be yours again, and the thousands of years spent on a world that is scarcely conducive to life shall end.

What happens when you combine Industrialist Grunge with Equestria? A completely different setting, where trees are sparse but clubs are plentiful. The Elements of Harmony do not act as they normally would; sure, Rainbow Dash is still loyal, Fluttershy still loves, Pinkie Pie is still the creator of laughter, Rarity is still generous, Twilight Sparkle is still the intelligent one and Applejack is still honest. But none of this comes into play in the conventional style. No, this world is a world where it is dangerous to be alone and even more dangerous to go into foreign groups. PinkieShy shipping included.

After a dragon attacks Ponyville, Twilight discovers she has a strange new ability. What does it have to do with the dragons that are cropping up everywhere, and what will it mean for Equestria? (Skyrim Crossover)

Twilight Sparkle attends her first Election Day as a citizen of Ponyville! However, things don't go according to plan when her own notoriety catches up with her a few hours before the votes are cast. Twilight is forced to reconcile both her time as a royal insider and her new position as a member of the Common Assembly, but can her personal morals live up to her political responsibilities? Can her loyalty to Celestia?