Dark Impulse (KHBBS)

Dark Impulse (ダークインパルス) is a Level 2 Command Style exclusive to Terra in Kingdom Hearts Birth by Sleep. It is activated by using Zero Gravity-related, Magnet-related, or dark Deck Commands.

Kingdom Hearts Birth by Sleep
After visiting Destiny Islands, Terra heads to the Badlands and talks to Master Xehanort. He tells him that Ventus was going to confront Master Eraqus. Fearing the worst, Terra left with determination to save his friend by any means necessary.

Upon arriving at the Land of Departure, Terra refuses to move and battle Master Eraqus in an ordinary sword fight. But when Eraqus uses light on the boys, Terra summons his darkness and sends Ventus away. Terra uses his darkness throughout his battle against his master.

Mechanics
While using Dark Impulse, Terra attacks become faster and deal dark damage. The standard four-hit combo deals 180% damage and lifts him off the ground as he barrages them with a fast and furious flurry of Keyblade slashes and clawing attacks from the free hand. The combo finisher ends with Terra materializing a large hand of dark energy and deals 340% damage to enemies. The standard combo while attacking is a four-hit combo. The finisher composes of Terra sinking into the ground, homing in on a single enemy and quickly moving under that enemy, and then jumps out of the ground, materializing the hand again straight up into the air, dealing 1050% damage.

Appearance
When using Dark Impulse, Terra gains a dark aura around him and a black light is focused on his left hand. Wisps of darkness emit from his body, as well.

Kingdom Hearts Birth by Sleep

 * Terra learns Dark Impulse after visiting the Keyblade Graveyard a second time.