In this #BattleTheBeast story, Quentin enters the magical land of Fillory through a rainbow in one of his earliest battles against The Beast. He is joined by his friends Alice and Elliot on a quest to rescue the Keeper of Rainbows, who's been kidnapped by The Beast. They are called through the rainbow by the Keeper's daughter, Marigold. If they don't succeed, the magical rainbows of Fillory could be lost forever.