Dicey Convictions

You disregard game balance and point to a creature within range, attempting to convince it that rolling for stats is the preferable method for determining a character's ability scores. Choose an ability score, the target must make a saving throw of the ability you chose. On a failed save, the target takes 4d6 drop the lowest psychic damage and has disadvantage on ability checks and saving throws of the ability score that they saved against this spell with.