Sonic Impact changes Terra's Slide technique into an offensive rush.
Sonic Impact (ソニックスライド Sonikku Suraido, lit. "Sonic Slide") is a technique that appears in Kingdom Hearts Birth by Sleep and Kingdom Hearts 3D: Dream Drop Distance. It allows the user to perform a charging attack while sliding that sends enemies flying.
Mechanics
In Kingdom Hearts Birth by Sleep, Sonic Impact is a movement command exclusive to Terra that is executed by pressing 
while using Slide or Air Slide. It has a maximum level of 4 and fills the Command Gauge by 20% each time it hits an enemy.
In Kingdom Hearts 3D: Dream Drop Distance, Sonic Impact is a movement command that is executed by pressing 
while using a Dodge Roll-type command or Air Slide. It grants +10 to maximum HP and +2 to Defense when attached to a Dream Eater recipe.
Learning Sonic Impact
Kingdom Hearts Birth by Sleep
- Terra obtains Sonic Impact after winning the first ten rounds of the Games.
Kingdom Hearts 3D: Dream Drop Distance
- Riku can obtain Sonic Impact from a chest at the Windmill.
- Sora and Riku can purchase Sonic Impact from the Command Shop for 300 munny, 240 munny during Bargain Flurry, after reaching Shop Level 5.
Other appearances
- Terra-Xehanort, as an extension of Terra, can use a darkness-infused version of Sonic Impact.
- No Heart can also use a variation of Sonic Impact in his battle.