 Spira 's fictional history centers around an ancient war a thousand years prior to the start of the game that has Yevon preserve the memory of Zanarkand . Yevon 's people became the fayth to create this manifestation and Yevon made himself into Sin to protect it . A religious faith is built on atonement and sacrifice , creating a spiral of death that runs throughout Spira 's history . A ritual known as " the Final Summoning " would provide brief reprieves from Sin 's terror , called the " Calm " ( ナギ節 , Nagisetsu , lit . " calm time " ) . After completing a pilgrimage the summoner and a guardian would defeat Sin by sacrificing their lives to bring about the Calm . 
