Battle Double Ring

Once per day you create a shadowy double of yourself that superimposes itself on you. As a bonus action, you can move the double up to 30 feet away from you; you can then use it as the source of any attack as if you were standing in the double's spot. At the end of your turn, the double returns to your space. The battle double can't be damaged. It has no real, physical presence except in the moment when it attacks.