After the events of "Broken Spirit", things couldn't be better as everything is once again in perfect harmony, and Equestria has gained a new guardian. When things first begin to affect the land, nopony pays much attention until utter destruction begins to take hold, particularly on Equestria and the realm of Disarray. The rulers of the lands find themselves powerless and desperately seeking the source of the madness, unaware of the darkness they will find in the truth.
Now Discord, the princesses, and the six must team up with an old foe to find answers, and fast. As secrets are revealed, the realms suddenly find themselves launched in a war against the threat, and in the midst of the journey, Discord finds himself becoming more acquainted with his background than he'd like to be, as questions are answered. Is he really the product of demons? And what was his life before he ended up in the care of Aegeus and Astraia?