After so many failures in taking over Equestria, the sadistic Changeling queen has declared total war on Equestria. Forced to be spread out to different corners of the country, Twilight Sparkle and her friends prepare for what may be the toughest crisis they've faced, with an old ally returning to aid them.

Little does anyone realize, however, that something has come to Equestria, something which when discovered, will shake the foundation of the country to its core and turn the tide of victory in favor of either the Changelings or the newly established Guardians of Harmony. Which will it be?