Скачать или смотреть Crystal Passive U3 DFFOO

Crystal Passive U3
10% HP DMG Bonus during Force Time

but decrease FR charging by 40%

In this test, Rosa Blue, Aerith Red, Sherlotta Yellow

Sherlotta is equipped with U3 while Rosa and Aerith are not

But the FR charging affects the whole party as it directly affects the gauge it self.

With and Without
A turn charger by 2.2% and 1.8% with U3
Fast Charging 10+% reduced to 8.8%

Worse is Bonus gauge charge we get after a turn cycle is reduced too.

But if you are the type to just use a fast charger and spam fast charging skill till 100%, U3 passive reduction is not as critical. Without fast charging, you might take 20 turns to reach 100%.

For the HP DMG Bonus, sadly, it is only on the crystal colour, so in this run, only Sherlotta get addtional 10%.