LogFAQs > #953636159

Are any of those worth actually using that character? Currently the only character I have with a 6* is Snow (Wild Jaguar); I did switch out Galuf for him to make use of that SB and it was worth it.

Snow's Wild Jaguar is an AASB/Awakening Soul Break, which is about two tiers of power creep over the other stuff you just got.

Femme Fatale and Fujin's Moon Ring are the OSB (Overstrike Soul Break) for those characters: one big cap-breaking hit, costing half a bar. I would venture to suggest that they will overall outperform most 5* Soul Breaks, but once you get some good Ultras (or, better yet, Awakenings and Syncs), OSBs will just be a supplement, convenient to have in your pocket when the boss is stacking defense buffs that only breaking the damage cap can abate.

Guard Staff is Montblanc USB (Ultra Soul Break), which does... some damage, Protect and Shell, and an enemy debuff. Well, you do want Protect and Shell pretty much constantly, and if you don't have a better source then Montblanc will do. With that said, once you get a healer Glint+ with "free instant Haste Protect Shell" (and pretty much every healer has one, nowadays) you should ditch Montblanc and never look back. Poor Moogle is a fire-ice-lightning mage from a realm that's focused hard on holy physicals.
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I don't like this duchy. Now, it's an adventurer.