Some weeks after the royal wedding, tragedy strikes Equestria. Our heroes are rounded up and learn of a new threat that is looming over their peaceful little world, a threat more sinister than all the others so far, as their new enemy won't hesitate to shed blood to obtain what they're after, creating disarray among our team of friends. What is it that they really want? And are the elements of harmony strong enough to do something about this otherworldly nemesis?