Starlight won. She prevented the sonic rainboom. She stopped the mane six from getting their cutie marks. Unfortunately she did so at the cost of her own life. Twilight managed to tell Celestia and a younger Sunset everything before fading away. AU.
Loki Odinson of Asgard has fallen from grace, only to find himself in an unknown realm. Reaching out to him is Princess Luna, whom he shares many similarities with. Will Loki take her help and get better, or will he spurn it because of his arrogance?
With the war of Nightmare Moon drawing to a close, Princess Celestia sends one of her most prized disciples, Researcher Twilight Sparkle, to solve the mystery of a powerful magical weapon with the power to rid ponies of their magic. A little filly?
Starlight and Twilight drink a potion which reveals the downward spiral one of Starlight's alternate universes took. Meanwhile, Twilight watches Starlight take a downward spiral of her own.
Princess Rainbow Dash and her friends have found themselves in the newly restored Crystal Empire, and now struggle against the forces of Queen Chrysalis and the enigmatic King Sombra in an effort to reclaim Canterlot and save Equestria.
After Twilights friends go on a quest, Rainbow Dash is the only survivor. Twilight tries to fix her heartbroken friend. Warning:Extreme TwiDash shipping.
You may need an editor, but the story seems interesting.