(This is an old story I wrote three years ago during season 1)

Twilight Sparkle's birthday has come around, and Rainbow Dash is unimpressed with Rarity's present. When Applejack pokes a bit of fun with her friend, Rarity becomes unusually upset. Twilight Sparkle investigates her friend's feeling, learning something she never expected about her friend and why she is truly suited to be the element of Generosity.

Spanish translation: https://www.deviantart.com/spaniard-kiwi/art/Simply-Rarity-Spanish-translation-846034960

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?

When the lands were covered by fire and magic, not everything was consumed in quite the same way. Some creatures were spared the immediate horrors of the end of the world just to be warped and twisted by what was left behind. Others got to experience them first hand.

Notes:
Song that inspired this is Balefire by Princess Addictia

A young filly in present day Ponyville is cursed with nightmares of post-apocalyptic Equestria. She finds herself influencing the course of future history in ways that she cannot understand. She must learn to balance her life at home with her life on the other side of the veil, and fight to preserve her own sanity, and her own innocence.

She discovers that such a task is only possible through the magic of friendship.

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

Hope is the faith of the young. Losing everything she holds dear, Puppysmiles embarks on the adventure of her life to find her mother, her hopes of meeting her again driving her through the horrors of a world not of her making. Too bad the Wastelands doesn't care about hope.

The megaspells detonated. The world died. While most of the surviving ponies did so in underground Stables, the pegasi hid in the clouds. Rainbow Dash, the most celebrated of their ranks, disagreed with their abandoning the world below and left to seek those in need. In doing so, she was branded a traitor. For when Rainbow Dash left, she took the key to the pegasi's continued dominance with her. To retrieve this "key", the pegasi hired a mercenary to bring it back. The mercenary was Gilda, an old friend from long ago. The "key" is Dash's head.

When a freak and powerful storm rolls in from the Everfree, strange events are set in motion. Reports of bizarre creatures, odd ponies and wild magic abound.

The Bearers of the Elements of Harmony must face down their enemies, fight for their world and face their fears. Some of the bearers must face even more than that, and face them alone. Read now as ancient secrets are unveiled, powers thought lost are unearthed and powerful despots seek to rule with an iron hoof.