Unluck

This spell alters fate and inflicts bad luck on the target. You target a creature within range and force it to make a CHA saving throw and on a failed save it has disadvantage on D20 tests for the duration. Having advantage on a D20 test does not cancel out the disadvantage imposed. The target can attempt the saving throw at the end of each of its turns, ending it on a success. The target cannot attempt the saving throw for the first 1D4 turns of its casting.