The Castle of the Two Sisters has a long history, dating back to Equestria's early beginnings. Back when Star Swirl still taught the ponies who would become the future rulers of Equestria.

In the present day, Star Swirl's research into dimensional theory has created connections between two worlds, and even helped facilitate cross-dimensional friendships.

But not all of his experiments were recovered or even recorded. And not all of them were considered dangerous enough to be destroyed.

[Human-kitsune transformation]

This story is a sequel to Horn And Wings

Cromach is a griffon soldier who, as many young ones do, suffers from being too smart for his own good. He coasts through life until the point when he breaks one of the fundamental rules of Griffon Imperial Legion and gets punished for it. Unfortunately for him, the punishment for said transgression is death. His only choice now is whether his is going to be slow and torturous or quick and painless.

Too dark? Well, it's not that bad. According to books and movies it is possible to survive in the desert and return to normal life, right?

Too bad none of that matters because this story isn't his.

As an unstoppable hurricane bears down on Manehatten, Rainbow Dash has to face the unpleasant truth that not all of life's obstacles can be overcome. Sometimes you just have to do your best to get by. And when Dash gets the opportunity to become a Wonderbolt for a day, doing her best takes on a whole new, unexpected, meaning.

Editing provided by: Spabble
If you like this, try: Words Failed Her

Sequel: Left Behind: Sunny Disposition
Apparently it was scouted and is on EqD too

Nightmare Moon was meant to be released after a thousand years. A momentous occasion for her but terrifying for all the ponies on her day of freedom. She would get revenge on her sister and cover the world in darkness and shape everything to fit it.

That was the plan, at least. Instead, something went awry with the spell and she wasn't released when she was supposed to be. The mare-in-the-moon is brought into a world with stagnated technology, giant cities, and no sign of her sister or any of the other immortals. In fact, ponies don't seem terrified of her at all, and the stay within the core of her powers infused and changed the alicorn's body drastically.

The alicorn had no obstacles left! But...she was also a relic of the past. A past everyone seemed to have forgotten. A past she could no longer look upon.

Artwork by ElkaArt. Link in source.
Big thanks to Kryostase for helping spot errors I've missed.

Sequel

Three young ponies take it upon themselves to quest onto the artificial continent of the undead: Arkom. Raised hundreds of years ago by a dreaded vile lich that terrorized the world for two millennia, it is the staging grounds for him to raise his armies, prepare new horrific spells, and return to the mortal realm to spread death and decay around.

He was last seen two hundred years ago after almost wiping out the griffins, minotaurs, and turning most of Saddle Arabia into a burnt ruin. The silence from his realm terrorizes the countries around who only have legends and festering scars to remember. The three ponies intend to do what previous heroes have failed to do: Slay an undead necromancer of untold power.

But...something feels off when they arrive on the shores made from bone dust and dried flesh. The continent feels like it's...loafing around.

The cover was generated by Craiyon (formerly Dall-E) and then upscaled. A nice little experiment that could be helpful in the future.

This story is a sequel to The Chaos Within

One thousand years. For 1000 years, Dex stood as a statue within Canterlot Castle's gardens. After all that time, he finally gets released, but as he learns of what he lost, he finds that his actions have consequences.

Edited by: Cpl Hooves

Start your journey through Dex's life with Equestrian Life, here. Alternatively, you can begin with The Chaos Within.

This story is a sequel to The Teacher, the Sorceress, and the Wonderbolt

Far in Equestria's past, an old threat once more rears it's head, seeking revenge on the princess who thwarted it; a princess that is no more, her life claimed in the effort to destroy it. But this time is different. This time, it's come prepared. This time, it won't underestimate its enemies. This time... it can't lose.

Just an FYI, even though it says this is a sequel to TSW, it is in fact, a prequel to it. Sorry for any confusion.

As a result of being deserted by their friends after the Canterlot Rodeo, Rarity and Pinkie are forced to hoof-cart it home. Will they make it one piece?

History is a vague thing. It is written by those who are left behind to tell the tale. Who can tell truth from fiction if any chance for a viable reference is far beyond reach?

What knowledge is altered? What is lost? What is hidden away?

And for what purpose?

Knowledge can be a powerful yet dangerous tool. Especially dangerous for those that rely on knowledge alone.

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This is my first try on writing. Any feedback is welcome!

I will add more character tags as the story progresses. Don't want to spoil the fun after all.

Ponyville is being threatened by the ravaging gang of drakes, Krastos’ Krew, looking to eat the town out of house and home! Brute force won’t work against these creatures, but Twilight Sparkle comes up with a plan to end their threat once and for all. A plan that rests on the shoulders of...Fluttershy?!