Quote Originally Posted by ForestOwl
Tommy, you can't customise the Celestial Weapons, you just unlock their abilities using Crests and Sigils. Your Caladbolg will be just as good as anyone else's Caladbolg.

1. Onion Knight - Magic Booster + 1 MP + Doublecast Ultima = Fun
2. Masamune - First Strike helps against Great Malboros in the Omega Ruins
3. Nirvana - Not quite as good as the Onion Knight because it doesn't have Magic Booster.
4. Caladbolg - E&C helps a lot against physical attacks.
Sorry, I was getting confused, I started talking about another weapon for some odd reason, sorry.