The Lightning Bolt is a chargeable attack spell. The longer you hold the button, the more powerful the spell gets, until the progress bar is filled. The bolt gets larger and does more damage with a higher charge. A fully charged lightning bolt can instantly kill weaker enemies. The lightning bolt also has the advantage that it does not stop when it hits an enemy, only when it hits a solid surface. This makes it useful for taking out enemies that are lined up in a corridor.