Deep below the catacombs of Canterlot castle lies the crystal caverns where the most greediest of unicorns go in search of power and gems, but as legend goes that any who enter never come out. Just below the surface is a long and forgotten city of towering black structures which have lain dormant for many millennia, but recent disturbances caused by diruptive forces and a new found hate the forgotten city slowly awakens to counteract this new foe, this.......Love.

An optimistic asari archaeologist.
A turian ex-soldier with a dark past.
A bitter krogan mercenary.

Mutual benefit binds them together as they plunge into the depths of the Perseus Veil sector to find the motherlode of artifacts on an uncharted world, one year after the end of the Reaper War.

Three weeks after the changeling invasion, the citizens of Equestria, Gryphonia and all other countries of this planet learn that they are not alone in the universe.

No side will come out of this encounter unchanged. All actions have reactions, and all choices have consequences.

***

Crossover between the Mass Effect Universe and MLP.

I don't own either franchise.

For those interested:
This story takes place after an alternative, fan ending of ME3. The link to an explanation of the fan ending is here:
http://koobismo.deviantart.com/art/Explaining-Marauder-Shields-The-Instructions-318273827

However, the Destroy ending will also work for the purposes of this story.
You may want to read the inspiration and thanks first.

Cover Art: A composite of images by VICTORIA-badwolf, yanarada and electric-fox

Nightfall is over Equestria and the moon shines brightly as Princess Luna protects her subjects. However, a creature comes to Equestria in the night, crash landing inside the Everfree. Its arrival will spark a search for things forgotten and bring terrors into the peaceful land. Luna must put the pieces of a mighty puzzle together to protect her ponies, but enemies are around every corner and allies are few and far in-between.

Ponyville faced an ordinary day, but then night came, and with it a massive gateway into another world. It closes before any action can be taken, but now the Mane Six and Canterlot nobility are tasked with finding out what they can about the gateway. Who created it? Where did it lead to?

And most importantly, did anything come through?

Takes place after Season 2
Now 20% cooler with a TVTropes page!

Equestria is expanding unstoppably. The Conversion Bureaus are working at peak capacity. It looks absolutely certain that Celestia will replace humanity with ponies.

But then one niggling flaw appears in her plan. You see, humanity's religions, while dismissed by Celestia as just more evidence of human barbarism, are correct in at least one respect. Humanity has a loving father, and what Celestia is doing makes Him angry. So angry in fact, He's going to do what He hasn't done since ancient times: smite.

Seems like Exodus is being reenacted, and guess who's playing Pharoah?

He was always considered an outcast, a black sheep. When his peers find his secret, that he likes to watch My Little Pony, they taunt and ridicule him for it. But, after a freak accident, he is taken away to the land of Equestria. Has he truly found his place? Oh, and he's an ork. That might be an important little detail. Warhammer 40k crossover.

The Sangheili are a saurian species of fierce, proud, strong, agile, intelligent warriors and skilled combat tacticians. They are named after their home planet, Sanghelios, and are known to Humans as Elites, due to their adeptness and skill in combat. The Sangheili formed the military backbone of the Covenant for almost the entirety of its existence, they fear very little, and take great pride in an ancient, honor-laden code.

However, this group of Spec Ops Elites, Grunt, and Kig-Yar have crashed landed in Equestria by way of a slipspace drive being detonated in the middle of the ship they were heading to, the 'Glory Upon Salvation'.

Now they have to find a way off the planet and back into space so they can continue their journey to the Blessed Path... by dropping hot plasma on human worlds.
But will they want to, when something they revere tells them otherwise?

Recently tagged as Teen for implied violence, and (maybe) minor gore in future chapters.

Spartans never die, they're just missing in action. This has never been more true for Jorge-052 as, after activating the slipspace drive that was supposed to kill him, he is instead flung into a strange world where war is but a distant memory. Will the aging soldier be able to adapt to this new peaceful planet? Or will his only salvation be found in finding a way back to his own chaotic universe?

(It's my first time, so be gentle)
Now featuring a TVTropes page by Sabo88