Critical Impact is a Level 1 Command Style exclusive to Terra, and can be activated by using attack commands like Quick Blitz and Stun Edge. The standard combo consists of three intense slashes which deal 125% damage, while the combo finisher is a powerful downward slash that deals 250% damage. The "Critical Impact" finish command consists of the user jumping in the air and then slamming their Keyblade into the ground, generating a small explosion that deals 400% damage.
Learning Critical Impact
Kingdom Hearts Birth by Sleep