During the finale of the Changeling Invasion, a winged being appears, cutting down the insect-like creatures. Strangely enough, the princesses seem to know him...one rather intimately. After the removal of Chrysalis, the person, now known as Mystrael, the God of War, tells the gathered ponies about a coming Darkness, one that threatens the very peace that pervades Equestria...one that he wasn't able to stop alone. With the powers of the royalty and the Elements, will the God of War be able to prevent this Shadow from covering the peaceful land?