Thought Flail

You instantiate a orb of energy tied to by a long spectral cord. as an action you create this 5 foot size orb within 20 feet of you, its cannot leave this distance or be moved more than 20 feet away from you. As a bonus action however you can swing this orb in a 20 feet radius around you if this collides with a creature it must make a wisdom saving throw equal to your spell save DC or be stunned and take 2d6 psychic damage, on a success it only takes half damage, but is moved 5 feet backwards. You may cast this at a higher level using a 5th level spell slot or higher increasing the size of the damage dealt by 2d6 per spell slot above 5th level.