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Ultimate Guardian was essentially an extended Marriage of Convenience, Into the Bevelle Palace, except that Yuna was not the featured character. Many boss dungeons are similar to those found in that previous event. Beginning in the Sanubia Desert, players worked their way through the rescue mission in Bevelle, through the Calm Lands, and into Mt. Gagazet in order to piece together Auron's story.
- If the player brought his Final Fantasy X native party through this event, several scenes of dialogue were reenacted.