After Luna has a dream, Twilight finds a dusty book that looks like it's old as Celestia. In it, it states that a 6th alicorn will come and destroy all love and hope. The more they find out about the mysterious book and alicorn, the more it seems that it is true. Ponies start disappearing, murders take place, and Celestia leaves for long periods of time without saying a word. But that is not the worst that can happen…