Existential Dread

You give the target a pat on the back, and say to them a horrifying truth. They roll a will save against your class DC. If they succeed, the target is now frightened of you, and stunned for 1 round + 1 round for however much they failed the roll minus 4.. For example, if your DC is 16, and the target got a 10, they would be stunned for 3 rounds. Every round they are stunned, they can roll the save again, but if they fail by more than they originally failed, they get stunned for an equivalent amount of rounds. Going back to our example, if they tried the save again, and rolled a 8, they would be stunned for 2 additional rounds.