Aeons

Characters

Legendary Weapons

  This massive creature has no inherent weaknesses. Start with a party
of Yuna, Tidus, and Auron, and cast Haste using Tidus. Then using
Auron, pummel Defender X with Armor Break and Mental Break.
Keep Tidus in the party to cast Haste on new party members, and
bring in Lulu once Auron's job is done.

  While Demi and Bio are ineffective, spells like Waterga work wonders.
Yuna should cast Protect and Cura on everyone as needed. If her
Overdrive Healer is available, she will be able to Grand Summon
in no time. Avoid summoning unless the aeon or Yuna is already in
Overdrive, because Defender X will make short work of them. The
only real challenge to this battle is keeping everyone healthy.
Armor Break and Darkness are the keys to success.