Five years have passed since the crowning of Princess Twilight Sparkle. An evil force by the name of the Six Sinestros seek to revive their master and plunge the Known World into darkness. Aiding Twilight in stopping them is another alicorn, whose past intertwines with that of Equestria's (and I don't mean Flash).
(Incorporates "Where the World Ends". My first story, so please point out any mistakes I might make. On Hiatus until I have more computer time.)
EDIT: I started this before the end of S4, so I had placed her castle in the Castle of the Two Sisters. I now realize my error and changed it so that her castle is in the right place.
EDIT 2: Please don't hate because Flash is even in the story.
EDIT 3: By the way, Spike is not fully grown. The picture is misleading about that…. sorry.