The day of the Rainboom affected more ponies than just the canon Mane Six. Almost ten years later, Princess Celestia sends her personal student Twilight Sparkle and one such affected pony to Ponyville. Meeting four others, they must work together to achieve what Princess Celestia could not: defeat Nightmare Moon and save the long-lost Princess Luna from the monster she was trapped within.

It's also a shameless excuse for me to partner Twilight with five of my favorite ponies. Welcome to the Differentverse.

(Extra character tag: Coco Pommel.)

Author note: All five chapters were fully written prior to initial submission and final publication.
Featured the day of its completion... woohoo!
Tropes page is here.