Upon activation, the machine creates 4 balls of force which circle around your person. As a bonus action on each of your successive turns for the duration, you may hurl one of the balls at a creature or object within the machine's range. Make a ranged spell attack against the target, and on a hit, the target takes 2d6 + 1 force damage and is knocked back 10 feet. The ball then dissipates.   If you are attacked in melee whilst the balls are circling you, the attacker must make a DEX saving throw or be hit by one of the balls, dealing 2d6 + 1 force damage and knocking them back 10 feet, preventing their attack. The ball then dissipates.