When you create or modify a Masterwork Weapon, you can add the Jolt property to any weapon, even one that doesn't deal Lightning damage. You gain the following benefit with any weapon that has the Jolt property.
Arcing Jolt
Once per turn when you use the Jolt property, you can expend one Charge Point to cause an arc of electricity to leap to a creature that you can see within 5 feet of the target. This creature is affected by the Jolt property and makes a Dexterity saving throw (DC equals 8 plus your Intelligence modifier and Proficiency Bonus). On a failed save, a creature takes Lightning damage equal to the damage dealt to the initial target, or half as much damage on a successful save.