Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
Prime - Maleficent 6★ Medal
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Sonic Impact is an Movement Command in Kingdom Hearts Birth by Sleep, exclusive to Terra.

Mechanics

In Kingdom Hearts Birth by Sleep, Sonic Impact allows Terra to chain Slide by allowing him to perform an extra charging attack. It has a has a maximum level of 4.

Learning Sonic Impact

This ability is exclusive to Terra, it is obtained in Olympus Coliseum after defeating the horde of Unversed.