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Boost Strike: Pay attention to the blue crosshair
As you attack an enemy, you'll notice that a diamond-shaped crosshair fills with a blue outline. The more combos you execute, the faster it fills. Once full, the STRIKE text shows and you'll have a very short amount of time to press a button (D-Pad) that corresponds to a party member. This will trigger a Boost Strike. Keep your eyes on this meter and use it ASAP for maximum damage.