"Final Battle" plays during the battle against Yu Yevon. It is the eighteenth track on disc 4 of the original soundtrack. The song is a 3-part variation and the third part (2:20-2:40) is infused with the melody of "Hymn of the Fayth". The Final Fantasy X HD Remaster arrangement uses real instruments and the piano is replaced with the xylophone.
"Final Battle" returns as a playable Battle Music Sequence that can be purchased from the song store for 5 sound medals. It was also the worldwide victory reward for the "Thunder Plains vs. Dalmasca Estersand" Lux Crystal Battle that took place between April 26, 2017 and May 9, 2017.