After the end of One Piece's Whole Cake Island arc, the brief Reverie arc showed the major rulers of the world meeting to discuss the various problems in the Sacred Land of Marijois. This arc was the first to show a mysterious, cloaked figure standing in front of an equally mysterious giant Straw Hat, who would later be revealed to fans of the series as Imu, someone who holds greater authority than even the 5 Elders!