Celestia has fought many powerful foes. Nightmare Moon. Discord. Chrysalis. But she has only ever feared one. When the nightmare from her foalhood returns for the lives of her pupil and her pupil's friends, what will Celestia do? Will she rescue the Mane 6 from a premature demise? Can she?

Credit for the brilliant cover art goes to my friend Martha at dingus-flavin.tumblr.com.