You throw a weapon which is then animated to strike on its own, attacking everything in a 30-foot line emanating from you. Make one ranged spell attack and compare it to the Armor Class of each creature in the line. If a creature would be hit by the attack, you are considered to have hit that creature with a melee attack using that weapon. You resolve all the effects of that attack normally, as if you had struck each creature with a separate attack roll. After this spell is cast, until the end of your next turn you can use a bonus action to cause the weapon to return to your hand.