Sin (head)

The head of Sin is a boss in Final Fantasy X, and is the last of the four-part battle against Sin. This time Sin will charge directly towards the player on the Airship, moving slowly forward turn by turn. After about sixteen turns, Sin will use its Overdrive (known as Giga-Graviton) to completely destroy the player's party, which is an instant Game Over.

For the first half the battle, Sin is out of range of physical attacks. Its only attacks, outside of the massive main attack, are status effect moves. Aeon's Overdrives are very useful in removing the massive amount of HP before Sin can destroy the player's party. If Lulu can do so, Doublecasting Flare or Ultima is also effective. Auron should use Armor Break to make Sin vulnerable to attacks, and Tidus should then cast Hastega on the party and use Quick Hit, which can allow him several attacks in a row.