For generations an arrow-shaped artifact has gifted the Pie family with strange abilities and agricultural prosperity. When A.K. Yearling steals it to save the world, Marble and her sisters have ten days to get it back before the farm goes bust.
Weird powers start popping up around CHS. Antisocial techie Care Root has one he can never use, until his world turns upside down and it becomes the last line of defense between his only chance at happiness and a shadow-war raging across Canterlot.
Ponyville's resident grump never believed in alternate timelines like her energetic bestie. But when a slog of a trip sends them into the 'World of the Plastic Beach', they gain strange new powers, and she learns more than she ever wanted to know.
"We're all here because of the ponies who came before and gave everything for us! Ponies spending their lives working for a future they’ll never see themselves... As long as I have the power of Stand, I'll never let you call that generosity a lie!"