Twilight gets a message from Celestia stating that, Nyx is chosen to be the new holder of the Legendary Dragon fox, a fox that can use magic. after Nyx gets the fox sealed inside her to use incase a threat comes, Nyx somehow got her magic back, and got the ability to fly. But when a mysterious pony named DarkFire appears, the mane 6, and Nyx will stop at nothing to defeat DarkFire and his "Master".

Nyx is from Pen Stroke's fanfic, Past Sins

This is an Unofficial sequel or side story of past sins