In Kingdom Hearts Union χ, Sonic Impulse is a special attack that targets all enemies. It costs 3 special attack gauges to perform. For 1 turn, it raises Player's Power-, Speed- or Magic-based strength by 4 tiers depending on the attribute, and lowers the targets' general, Upright- and Power-, Speed- or Magic-based defense by 4 tiers depending on the attribute. It raises Player's special attack bonus by 60%. It inflicts more damage against a single enemy.
Sonic Impulse +6 additionally raises Player's Upright-based strength by 3 tiers for 1 turn.
Learning Sonic Impulse
Kingdom Hearts Union χ