This story is a sequel to Sunset Shimmer is not an Alicorn

During the events of Between Dusk and Dawn Twilight delegated some monster-busting to the EUP. The EUP, not equipped for the job, delegated further. Now, Sunset Shimmer has been drafted into Equestria's forces to deal with the prophesied return of a dread monster. She's going to need to bring everything she's got to fight off the latest threat to Equestria, and the keys may lie in the ponies she hurt before she left.

A pony Sunset Shimmer wronged before leaving Equestria is back for revenge, and is insisting Sunset come to confront her alone. Can Sunset help the wayward mare? Can Sunset use the magic of friendship without any friends around? Is Sunset an alicorn? Well, do you see any wings?

Preread by FanOfMostEverything.