This story is a sequel to The Flight of the Alicorn

Rarity was certain her troubles with magical gemstones had ended, but an unexpected royal visit soon convinces her otherwise. In order to save an ailing Princess, stop an ancient menace, and avert a disaster that threatens the survival of a lost tribe of ponies, Rarity, Blueblood, and a brave group of friends will travel to strange and foreign lands, and into the fathomless depths beneath tormented seas. In her quest to uncover the secrets of the Abyssal Forge, Rarity will have to use all her charm, wit, and skill—and rely on allies old and new—as the unlikeliest of ponies once again attempts to save the world in style.

Part Two of Three
The Adamant Triskelion - Book One: The Flight of the Alicorn
The Adamant Triskelion - Book Two: The Abyssal Forge
The Adamant Triskelion - Book Three: ???

Beautiful cover art by Lucky Dreams.

Inspired by the heroics of the mysterious mare known as the Stable Dweller, Silver Storm, a guard of the town of Marefort, decides to go on a daring mission to rescue her captured brother. Of course things rarely go as planned and her attempts at heroism drags her into a tangled web of plots and conspiracies as warring factions vie for control over the last great city: Dise.

Spanish Version translated by Spaniard-Kiwi: https://www.deviantart.com/spaniard-kiwi/art/Fallout-Ecuestria-Heroes-996263393

On a dark night filled with even darker magics, an insane cult attempts to give Nightmare Moon a body and life of her own, utterly separate from Princess Luna. But, when the spell is interrupted by Celestia, something unexpected is created.

Now, a little black alicorn filly named Nyx finds herself living under the care of Twilight Sparkle, only to be haunted by memories and emotions from her past. Is she Nightmare Moon reborn or is she simply a doppelganger with a soul and mind of her own? Can Twilight Sparkle protect Nyx from those who refuse to see past her dragon eyes and black coat?

Or, will Nyx be forced to inherit the sins that may not even be hers and become the greatest evil Equestria has ever known?

"We have to be brave now, Scootaloo," Dash said. "Just close your eyes, and it'll be all over by the time you open them again."

Twilight Sparkle, Princess Celestia's most prized and faithful student, is being sent to Ponyville to learn about the magic of friendship.

And she's not happy about it.

Hear what Celestia has to say back! Check out the spinoff:
Responses To A Disgruntled Friendship Student by keaton-furman-prower

Still want more? Have a multiverse spinoff by MixMassBasher, my contributing writer for Seasons 5-9.
Letters From Across the Disgruntled Multiverse

Editing by Neko Majin C.

Disclaimer:
The following is a work of parody, and is protected as Fair Use under section 17 U.S. Code § 107 of US Copyright Law. My Little Pony: Friendship is Magic and all affiliated characters are property of Hasbro Inc.