Discord has been telling Rarity about the various adventures that her friends are supposed to be going on, in 'other worlds' no less, though she politely listens to them so she doesn't hurt Discord's feelings. She never once believed that he was telling the truth, not with how outlandish some of his tales had been, but her mind changes when Sunset Shimmer and Starlight Glimmer return from their own adventure with powers beyond anything she had ever heard of before. Before long she decides to investigate the mirror herself, where she steps into an unfamiliar world that is unlike anything she has seen before... only it is a world that terrifies her.

Rarity awakens in a place called 'Things Betwixt', a limbo between worlds, where she discovers that she's in an unfamiliar body and in an unfamiliar world with a different set of rules than what she is used to. Along the way she discovers that she has been cursed in some manner, making her one of the cursed undead that roam the new world she has discovered, and that there might be some small hope of reversing her condition. She also discovers an companion who wishes the same thing and decides that, by working together, the two of them can free themselves from their curse and return to their normal lives.

She and her companion must survive the dangers of the world she has found herself in, complete the most insane quest she has ever heard of, and hopefully cure themselves of their curse... and hopefully she can find a way back home once their quest is over.

(Dark Souls 2/MLP Crossover)
(Part of the Universe 13 story series, though reading the other stories is not required)

Feeling dissatisfied with the unending rule of Princess Celestia and Princess Luna, ponies set about to forge into the unknowns of space. They developed technology that allowed for orbiting colonies to be built and prosper. And for a time there was peace, then the princesses launched their own space colony.

This act instigated a war that almost brought an end to pony kind. After years of fighting, an agreement was founded. which ever representative wins a fighting tournament wins the rulership of Equestria and the space colonies for the four years in between the tournaments.

It has been sixty years since that decision. This year marks the start of the fifteenth tournament for rulership. But, is there more behind this tournament then meets the eye.

A crossover between the worlds of My Little Pony: Friendship is Magic and G-Gundam.

For a thousand years, peace has reigned over Equus, in large part due to a tournament known as the Gundam Fight. This tournament, held every four years, decides which nation will rule the others. Equestria itself, the origin of the Fight, has not won a Fight in over a hundred years. Will the return of the King Of Hearts, founder of the fight, allow Equestria to finally win?

Tirek, after being defeated by Twilight Sparkle and her friends, finds himself in a world that is different from the one he is used to, trapped in a body that is unfamiliar to him, and discovers that there are all sorts of powerful beings seeking to carve their own desires out of the world around them. As one of the 'Tarnished' he must rise to the occasion and overcome the challenges that stand in his way, to become the 'Elden Lord', or perish and allow his name to be forgotten.

(Elden Ring/MLP Crossover)
(Standalone story, not tied to an existing series)

Your name is Anonymous, the first(and only) Human in Equestria, and everything was going great for you.

A nice job helping out on Applejack's farm, beautiful house, and even a generous stipend from Princess Celestia on account of your Diplomatic Representation of Humanity. Yes, life was swell...

Until a purple horse invades your privacy and discovers a buried relic of a bygone era:

Your Magic cards. All hell broke loose after that.

(Based on true events between me and a few friends on Game Night.) Full Disclosure: there will be swearing, kicking, screaming, and yes, even a table flip.

Spike comes over and tries to teach Rarity about the card game Magic: The Gathering. He's hoping that she'll enjoy the game and become a player just like him. Hopefully Spike can teach her well and get her to enjoy his favorite game.

In the sequel to "Rarity Tries Out Magic", Magic: The Gathering has become popular at the Ponyville Schoolhouse with everypony going out and buying starter decks. Everypony's having a great time with their cards and battling each other. However, one pony seems to be unstoppable in her quest to defeat each and every single pony in class with her deck combinations. With the rise of this student, can anypony there defeat this player and restore balance to the school?

Something is gathering around the bearers of the Elements of Harmony. Something dangerous. Something magical. There's only one pony with the knowledge, the skills, and the muffins needed to save Equestria as we know it.
A Friendship is Magic: the Gathering crossover, taking place between seasons 1 and 2. Here there be flashbacks, briefly seen OC's, and possibly every emotion known to man or tiny horse. Abandon all pretenses of not being a nerd, ye who enter here.

Shawn Spencer, psychic detective, is a thick-tufted boy genius who ice skates through life on polished blades of snarky eloquence. He has tested himself against some of the greatest criminal minds of his time and emerged victorious... though often through unbelievable luck and not a small amount of bumbling.

Now, he faces a challenge unlike any before. One that will test his mind, his sanity, and his adaptability as he is thrust into the midst of an unfamiliar world and the ponies who populate it.

The Mane 6 face their own challenge, as an old enemy, tempered in the crimes of a much harsher world than theirs, returns to Equestria. It is a challenge they are ill-prepared for and one that only their strange, new, alien friend can help them overcome.

The ponies of MLP are common to singing happy and solemn songs, but all have the same pop music genre to them. But one young stallion by the name of Iron heart decides to mix things up with some of his music during a singing contest.

This will obviously have singing in it and its all metal bands if you are wondering

Here is a list of the bands that will be used (the songs will also be linked in the chapters
1. Killswitch engage
2. All that remains
3. Trivium
4. Demon hunter

And of course none of these are mine, the songs go to their rightful owners.