Themrokk's Shocking Smite

The next time you hit a creature with a melee weapon attack during the spells duration, your weapon arcs with crackling static, and the attack deals an extra 2d6 lightening damage. Additionally, the target must make a constitution saving throw or be stunned until the start of your next turn. After that the spell ends. If the target is wearing metal armor, the target has disadvantage on their saving throw.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the additional extra damage dealt by the attack increases by 1d6 for every spell slot level above 2nd.