Lightning Sword Flash is an upgraded version of Bloody Fissure Thunder Thrust, and is the first elemental sword technique Luka learns. Alice teaches it to him after he defeats the Scylla. It uses the speed of wind to deliver piercing blows.
Like its predecessor, it requires 2 SP, and damage is increased on its first turn. However, unlike Bloody Fissure Thunder Thrust, Lightning Sword Flash’s damage is increased when Sylph is up, and its damage no longer wanes as the battle progresses.