When you cast this spell, your weapon hums with violent energy. The first time you could make a melee weapon attack before the end of your current turn, you can launch a scything blade of force from your weapon instead.   Each creature within a line 5 feet wide and 30 feet long must make a Dexterity saving throw, starting from the creature closest to you. The first creature that fails takes 2d8 force damage and suffers damage and effects as though you had hit them with a successful attack using that weapon.