chunk: Upon the Emperor's arrival at Arrakis, he executes Rabban for failing to remedy the spice situation, calling in Baron Harkonnen to demand an explanation. At the same time, Paul launches a final attack against the Harkonnens and the Emperor's Sardaukar at the capital city of Arrakeen. His Fremen warriors, riding in on sandworms and brandishing their sonic weapons, easily defeat the Emperor's legions, while Paul's sister Alia kills Baron Harkonnen. Once in Arrakeen, Paul faces the Emperor and engages Feyd-Rautha in a duel to the death; Paul kills Feyd and relieves Emperor Shaddam of power. Paul then demonstrates his newfound powers and fulfills the Fremen prophecy that he is the promised messiah by causing rain to fall on Arrakis for the first time ever, as Alia declares him to be the Kwisatz Haderach.