Touching your blade, it is sheathed in radiating blue energy. It emits a low blue light that can be seen within 15 feet in nonmagical darkness. On each hit with the spell cast, your weapon attack does an extra 4d8 force damage. The creature is forced to make a Charisma saving throw on a successful hit. On a failing saving throw, the creature is stunned until the end of their next turn, and you gain advantage on any saving throw the creature forces, and you choose one saving throw and force the creature to have disadvantage on those saving throws. The stunned effect ends at the end of the affected creatures' next turn, while the other effects last until the spell ends or if the spell is dispelled. On a successful saving throw, the creature is not stunned or otherwise affected.