After Chapter 2

In this chapterIn Macalania Temple, Seymour is revealed as a murderer who killed his father, and Yuna kills him in a Sending.

At Macalania Temple Seymour is exposed as a murderer who killed his father to become maester. Yuna and the party defeat him, but he returns later. In the Bikanel desert the party meets the Al Bhed, a people hunted by Yevon for using machines. Rikku joins, and Auron reveals a secret: Sin is Jecht, Tidus's father.

The reveal about Jecht is the game's pivotal twist. Tidus has been fighting his own father, and the pilgrimage becomes a family tragedy. The Al Bhed show the theocracy's cruelty. Yevon bans machines and persecutes those who use them, a metaphor for religious intolerance. Rikku's cheerfulness lightens the mood and gives the party a bridge to the Al Bhed.

In this chapterAt Bevelle, the party is condemned and learns that Yevon has lied for a thousand years.

In Bevelle the party is judged by the temple. They learn that Yevon has hidden the truth: the Final Summoning requires the summoner to sacrifice a guardian, who becomes the new Sin. Yuna and the party decide to find another way. They climb Mount Gagazet toward Zanarkand. The revelation is the game's moral heart. The pilgrimage is a cycle of sacrifice that cannot end, and Yuna chooses to break it.

The party's decision to defy Yevon is a major step in their growth. They go from pilgrims to rebels. Gagazet is a spiritual climb that tests their will.

In this chapterIn ruined Zanarkand, the party meets Jecht's spirit and learns that Tidus is a dream of the fayth.

In the ruins of Zanarkand the party learns that Tidus is a dream created by the fayth, the spirits of ancient people. Seymour is defeated again, and the party fights Sin from inside. They destroy Yu Yevon, the summoner who became the parasite of Sin. Without him, the fayth lose their reason to dream, and Tidus fades away.

The ending is among the most moving in gaming. Tidus's disappearance is both sad and meaningful, since his dream saved a world. Yu Yevon's story is a tragedy of grief: a summoner who tried to save his city by turning it into a monster. Yuna's speech at the end shows that she has become a leader. She will rebuild Spira.