When the melee attack is made, a number of lightning projectiles (five at level one, increasing with gem level) will shoot out in a ~85 degree arc, traveling in a straight line untill they strike an enemy. Unmodified projectiles will do 75% of full weapon damage, of which 50% of physical damage is converted to lightning damage (the bolts benefit from added damage, e.g. as from aura's), against any target struck. Linking a Lesser Multiple Projectiles Support or Greater Multiple Projectiles Support support gem will multiplicatively reduce the damage of each projectile and spread further projectiles out within the 85 degree arc.

Cannot Miss: This applies only to the projectiles launched after you initiated the strike. Swinging in enemies' general direction will result in projectiles with a hit/miss chance equal to that of the skill itself. Projectiles that miss will be dissipated without doing damage.

Damage conversion: Like all converted damage, the lightning portion of Lightning Strike's damage will be modified by both lightning damage and physical damage increases. Furthermore, the damage done by the lightning bolts is considered projectile damage (instead of melee), therefore any Strength bonus does not apply.

It is important to note that despite the confusing wording of this skill, the projectile portion of this attack in no way scales off the melee portion of the attack - in essence, the Lightning Strike skill does two completely separate things simultaneously, a melee attack (which deals x% of the base damage, and of which 50% of the physical damage is converted to lightning damage), and a ranged attack (which shoots projectiles, which deal 75% of the attack damage of the attack each, and of which 50% of the physical damage is converted to lightning damage).

This means that increasing the melee portion of the hit through melee-exclusive means such as Melee Physical Damage Support will not actually increase the projectile damage; the projectile damage is not "converted melee damage", a common misconception. Do not be deceived by the tooltip DPS of this skill which will change if you apply a melee-exclusive modifier; the tooltip DPS only shows the DPS of the melee portion of the attack and things that modify that, but not the projectile part of the attack.