being held prisoner in the castle. He also clashes with a replica of Riku created and controlled by another Organization member, Vexen, and believed by both Sora and the replica himself to be the real Riku. Axel, an Organization double agent kills Vexen for his "betrayal" to the Organization, but later releases Naminé and allows her to meet Sora in person. Sora discovers Naminé to be the one manipulating his memories, having been forced to do so by Marluxia, the lord of Castle Oblivion and the figure who lured Sora there, as part of his plan to overthrow the rest of the Organization with Larxene. Marluxia also was responsible for Vexen's death by ordering Axel to kill him for disobeying Marluxia. Sora climbs to the highest floor and defeats Larxene and Marluxia, after which Naminé puts Sora and his friends into pod-like machines to help them regain the memories they have lost, even though they will forget the events that transpired in the castle. Before they are put to sleep, Sora and Naminé promise to meet again as real friends once he reawakens, Sora firmly believing that his memories of her and the castle will remain in his heart despite being forgotten. In Reverse/Rebirth, which occurs congruently with the game's main story, Riku is transported from the realm of darkness to Castle Oblivion's deepest basement, and he fights figments of previous enemies to combat his inner darkness as he climbs upwards. Vexen fights Riku to obtain his data and creates his replica to counter Marluxia's plan. Ansem, still possessing Riku's body, tries to regain control of Riku, but Mickey's power keeps Ansem at bay. On the way, Riku battles and defeats Lexaeus, a member of Vexen's circle, only to be dragged into the realm of darkness. However, he is saved by Mickey when Ansem nearly succeeds in taking Riku's body as his own. With Marluxia eliminated by this time, another of Vexen's allies, Zexion, attempts to dispose of Riku by drowning him in light. Riku is saved by Naminé disguised as Kairi, who helps him to control his darkness, allowing him to defeat Zexion who later was drained of his life force by Riku Replica under Axel's (and by extention Saix's) orders. Riku later meets DiZ, an enigmatic individual interested in Riku who sends him to find Naminé. Riku's replica, who has since learned of his altered memories, seeks to