Arc Strike

Your hands are wreathed in crackling lightning. Make a melee spell attack against a creature you can touch. You gain advantage on the attack if the creature is wearing metal armor, or if they are composed largely of it. On a hit, you deal 2d10 lightning damage, and the creature must make a Constitution saving throw or be knocked prone.

For each level beyond the first that this spell is cast, it deals an additional 1d10 lightning damage.