After capturing an enemy pony, the Princesses decide on reforming them...in the Human World. Princess Twilight places the task on Sunset, trusting her to make use of the friendship lessons that she has learned. But Sunset finds herself at odds with their new guest. Without communication, can Sunset break through the prisoner's wall? Or will she play the warden until the Princesses grow tired and take drastic measures?

This story is a sequel to Steep Tail Wind

Captain Phantom Wing is back once more for his last adventure. He is attending IPAC aboard the Regal Moon. Not too much of surprise to him, something goes wrong when the carrier is attacked by rebels from Griffonstone. He and his fellow Bolts must fight with the crew to regain control of the carrier. Little does he know that the rebels have a surprise planned incase the Bolts do recapture the ship. This plan will make sure the Regal Moon sets for good. Will Phantom and his friends survive or is this the mission that finally does them in?

This story is a sequel to A changeling's purpose

A short Sequel to A changelings purpose, one of Thorax's changelings is caught and interrogated by the leader of the original changelings. But is everything merely black and white or will the changeling learn more knowledge behind the leaders actions? Why does he rebel? What's in it for him and why do those under his command follow him? The answer is not as different to Thorax's rule.

This story is a sequel to Discord vs. the Greeting-Card Industry

This is an unauthorized sequel to Fire Gazer the Alchemist's Reticence. If you haven't read that story yet, do! It's absolutely fantastic. I've gone ahead and made this story without approval due to the author's retirement from the site making it difficult to predict if they'll ever be around to give approval. While reading it is probably not 100% necessary to understand this story, it'd make it a lot better at the very least. Plus, reading this will spoil that story. Don't say you weren't warned!

This is also a sequel to Discord vs. The Greeting-Card Industry. It just won't make sense if you didn't read that story.

Discord thought his bet with Greeting-Card was settled. He was satisfied with his work thus-far, but that work wrought unforeseen consequences:

Actual, sincere gratitude and respect on the part of ponies around him.

Well, that's new.

Motivated by this, Twilight's pestering, and the fact that the bet is apparently not yet settled, Discord sets off to meddle in the romantic lives of even more ponies. Yeah, that'll probably be fine.

One day, Spike went with Twilight and Cadance to a valley near the Crystal Empire where they found an unexplored cavern. In there, Spike found some crystals that caused his personality to split up into a lot of copies of himself, and they ended up running free in the valley, now Twilight and Cadence must find them all before the original Spike disappears...

Not really proud of the writing here, but I did the best I could.
Someone already got the reference in the comments, so it's from the show 'Wander Over Yonder', but I changed some things in this fic so it's not exactly the same.
Still need to work on the grammar, orthography and pacing, ESPECIALLY the pacing.
Set between King Sombra's attack to the Empire and Twilight's BIG moment (Season 3).
Let's see which one of you can spot the errors on the story XD

Asem-369 is assigned to use an experimental slip space portal that is capable of transporting a human long distances from one plant to another fast, efficient, and within atmosphere. Using this experimental technology, ONI sent the spartan-ll through the portal to a supposedly Covenant established planet to nuke an 'important' Covenant base. But a malfunction causes the Spartan to teleport out of his assigned pelican to an unknown planet and gets sucked into its atmosphere. With the help of this planets weird inhabitants, he must find a way to get back home. But there might just be more to this planet and he thought.

No matter what happens no matter what case scenario he may be in, there's one thing the Spartan does now:

These ponies for the better or worse. Will change his life forever.

Takes place sometime in season 4

After a 17 year-old dies in a fire-fight, He is dropped into Equestria with his numerous injuries as an earth pony

Based in the FOE universe, A unicorn known as The White Death decides to visit the slave town of Old Appleloosa.

Twilight is searching through boxes in her storage room under the castle from salvaged pieces of the library. While looking through them she finds a tape. She invites her friends over so they can watch it together for movie night. What they see isn't expected.

A wonderful, fantastic VOCAL READING has been done of this by Flash Photo Reads. Please go to his channel and give him some love.exe.

Equestria has many secrets, but none quite as important as the one Twilight and her friends are about to discover. When two worlds collide and an ancient evil is released upon the multiverse once more, Equestria must team up with an unlikely enemy turned ally, and face the darkness together.
Two worlds at war, incredibly powerful magic and technology, an intrepid group of ten heroes, and an impossible force collide in this tale of adventure.