Twilight Sparkle and her friends have grown up now. A few of which have their own fillies! But when two old friends discover a young pony that had been raised in Equestria's royal palace, they also uncover a terrifying plot to tear apart the unicorns, pegasi, and earth ponies. And, perhaps, a hidden race. And now the only two ponies who know of this potentially devastating secret are on an adventure to ensure the safety of The Five Empires, to follow in the hoofsteps of their parents, and secure harmony.