They're useful if you want to finish bosses off before they put up their Perfect Defense palings where they're IMMUNE to both magic and physical attacks.
Quickenings aren't the only ones.
Certain Espers can do it, too.
The Balance spell can also do it. If your characters are at a high enough level, they are in Bubble status, and their HP is in critical status, then they can use the Balance spell to break the 9999 damage cap. The Balance is an AoE attack, so you will be damaging all foes in range for more than 9999 damage. To maximize the damage, wear light armor with the most HP bonuses.
Here's an example,
HP: 280/14675 (note that it only registers as 9999 on the display/menu)
Balance spell will then do 14395 HP of damage to all foes in range.
With your characters in Bubble status, Arise can revive your characters back for more than 9999 HP. I've seen over 17000 HP for this before.
I believe Quickenings chains can do up to 99999 HP of damage although I've never done near that much. Most I've done was around 40000.





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