Conductivity

You imbue a weapon of your choice with the power of a raging storm and add 1d8 thunder damage to the next attack you make with it. 

At higher levels. Roll an additional 1d8 thunder damage per spell slot past 1st level. At 5th level you can choose to affect another creature within 5ft of the original target. They must make a dexterity saving throw, on a success they take half of the applied thunder damage. At 8th level you can affect up to two additional targets and at 10th level you can affect up to three additional targets.