Years have passed since the Elements of Harmony were left behind to Twilight Sparkle by the circle of ponies who had once guarded them. Now it’s just the Princess of Friendship and her trusted consort, Discord. Enter Argyle Starshine, Twilight's son, a prince made of the stars and the Elements of Harmony themselves. Born with three strange crystals alongside him in a time where ponies from every walk of life are led by one of Twilight's once-trusted consorts, Azreal, the Prince finds himself in the middle of a corrupt mutiny of ponies fighting to rid the world of the last Princess and magic altogether. 

2,000 moons later, Argyle, the last of his kind, struggles to find out what being a Prince really means. However, when Discord is captured by none other than Azreal himself in former Canterlot - now dubbed Equidae, a diplomatic centre for this new way of life in Equestria - Argyle must set out to save his friend, discover exactly what power the gems of his truly hold, find out how to unite all three of the divided tribes, and above all, not blow his cover in his new earth pony home of Maretime Bay. His challenges only grow after his daughter, Sunny, enters his life, eventually leaving him with no choice but to abandon his home and family altogether when his superiors in Equidae start to question his loyalty to the new world order. Now he has to leave the fate of Equestria's magical revival in young Sunny's hooves, while questioning his own part to play in his manifest destiny. But can both save Equestria without the other?