Curse of Draining

You lay a curse upon a target within range as black and purple mist surrounds them. The target must make a WIS save or become cursed for 1 minute. While under the effect of this curse the target is slowly drained of magic losing 1 spell slot every turn up to 3rd level and starting with 1st level. At the end of each of their turns the creature may make another WIS save to end the curse.