Sora swings his keyblade upward to flash an aura of pinkish light to blast multiple enemies away, should he have more than finisher equipped, this can only happen against more than one target. The animation of the swinging motion is taken from Simba's summon function. In Kingdom Hearts II Final Mix +, the attack has less lag and an altered animation. Plus, in Final Mix, the aura has 'digital' touches to it, and in Final Mix +, the aura is redesigned and practically fills in Stun Impact's absence.
This already comes with the Limit Form in Final Mix +.