You shroud your weapon in humming electricity and make a melee attack against one creature within 5 feet of you. , On a hit, the target suffers the weapon attack's normal damage and becomes sheathed in electricity until the start of your next turn. If the target willingly moves 5 feet or more before then, they take 1d8+4 lightning damage,,At 5th level, the melee attack deals an extra 1d8+4 lightning damage to the target, and the banked damage increases to 2d8+4. Both rolls increase by 1d8 at 11th level and 17th level.