Celestial Weapons
The Celestial Weapons are the strongest weapons available for each of the characters available in the game. To fully unlock the weapons, you must also obtain the corresponding crest and sigil, which you can use to add on abilities. The weapons start with the 
No AP ability only, which makes them almost entirely useless.
To use the corresponding crest and sigil on a Celestial Weapon, you will need to obtain the Celestial Mirror. Use the link below for more information:
Celestial Mirror
How to obtain the Celestial Mirror—an item that you can use to power up each of the Celestial Weapons.
Once you have obtained the Celestial Mirror, you can begin the process of powering up each of the Celestial Weapons. Use the links for each Celestial Weapon below for more information on how to obtain them and the objects needed to enhance them:
Nirvana
The Celestial Weapon for Yuna, which you can obtain by capturing monsters for the Monster Arena.
Masamune
The Celestial Weapon for Auron, which you can obtain after you locate the statue of Lord Mi’ihen.
World Champion
The Celestial Weapon for Wakka, which you can obtain by completing and winning a Blitzball tournament.
Onion Knight
The Celestial Weapon for Lulu, which you can obtain by completing Baaj Temple.
Spirit Lance
The Celestial Weapon for Kimahri, which you can obtain in the Thunder Plains.
Godhand
The Celestial Weapon for Rikku, which you can obtain by entering an Al Bhed password whilst on the Airship.
Weapon Master
Achievement/Trophy
You will receive the 
Weapon Master Achievement/Trophy after you have obtained all the Celestial Weapons for each of your characters.
