Sonic Impact allows the user to rush through the air towards enemies. White energy takes the shape of an "X" in front of the user and damages any foes that come into contact with it.
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, the possessed version of Terra, can use a darkness-infused version of Sonic Impact.
- No Heart can also use a variation of Sonic Impact in the battle against it. In the HD 2.5 Remix, his Sonic impact is faster due to his increased speed and evasion to make up for his lowered defense.