«Sonic Leap» is a charge-type Sword Skill that consists of a single top to bottom vertical slash, similar to the 1-hit skill «Vertical»; however, «Sonic Leap» allows the user to charge from over twice the distance in an instant. The skill is also similar to «Rage Spike», except that this skill's range is shorter and its trajectory can be aimed at the sky.
The skill is activated by raising the sword high up, usually atop one's shoulder.
Kirito used this skill to charge at his mentor Sortiliena Serlut during their spar after she used «Still Water» to gain some distance. However, Sortiliena had been expecting such a move from Kirito and had been waiting for her whip dangling on the ceiling to fall down while their swords were clashing. Before Kirito was able to land a hit, he was hit by the whip and was sent flying backwards.
Kirito used this skill to charge at Fanatio Synthesis Two before she was able to finish chanting the «Armament Full Control Art». However, as Kirito reached the peak of his jump, Fanatio finished chanting and struck the black swordsman with a powerful ray of light from the Heaven Piercing Sword, shaking the trajectory of Kirito's skill.
Eugeo attempted to use this skill against Bercouli Synthesis One, but he had to decrease the power of his skill after noticing Bercouli's sword's special ability and was still hit hard by the heat haze, though he managed to survive due to weakening his charge.