Seiya is about to die on Leo Temple. Cassios leaves Shina's hut and goes to the Twelve Temples. There, he stops and defeats Shiryu and Shun, preventing them from going into Aiolia's temple to save Seiya. However, Cassios goes there and tries to save Seiya, because he knows about Shina's love for Seiya. Aiolia mercilessly kills Cassios, provoking Seiya's anger. Seiya burns his cosmos, reaching the Sevensenses and defeats Aiolia with his Meteors. Since Cassios died, Aiolia is free from the Pope's Demon Fist manipulation, and swears that Cassios' death won't be in vain.