After finding Nausicaä, he realized that she was kind and of good heart, although she was allied with Torumekia. Though his allegiance was towards the Emperor's brother Miralupa, he soon realized that the war against Torumekia was pointless, and followed the ways of Nausicaä and the Ohmu.
In the manga, he defies Miralupa and is killed after proclaiming the prophesy is true and refusing to name Nausicaä while under psychic attack by Miralupa . His powers allow Yupa, Asbel and Ketcha to escape and he warns off Nausicaä. His power is great enough that his last act is to protect Nausicaä from Miralupa .
In the anime, he sacrifices himself to save her and her friends; Jhil and Asbel. Then, later, when Miralupa nearly had a grasp on Nausicaä through mind and soul, his spirit radiated through Nausicaä and blew the faceless spirit of Miralupa away.
a See Page Conversions Between Editions to convert Deluxe Edition volume 1 (DE1) to other editions