Sequel to My Little Alicorn and Bringing Up Blueblood.

It has been almost a year since Luna first uncovered the Arcanus E Draconus and used its dark powers to turn her sister into a filly. Since then, she has become more popular than ever, to the point where the Filly Scouts have invited her to officiate their Jamboree, which is being held in Ponyville this year. At the same time, Celestia wishes to reach closure with the infernal tome, as well as escape from her own growing concerns over her future in Equestria.

Little does Luna know that another force is in Ponyville, looking for revenge. And it might just settle for vengeance by proximity...