All Celestial Weapons have two abilities in common. They are Break Damage Limit and Triple Overdrive.

Other specs.

Caladbolg: Evade and Counter and Magic Counter
Nirvana: One Mp Cost and Double AP.
World Champion: Don't remember, sorry.
Godhand: Gillionare, can't remeber the other.
Masamune: Counterattack and First Strike
Onion Knight: One MP Cost and Magic Booster.
Spirit Lance: No clue, sorry.


Oh, and Master Theif is a skill that can only be found on Armours.