Uncanny Prediction

You have an eerie ability to guess the next move of creatures you've Sized Up. You inform a foe that you know exactly what it'll do next, momentarily shocking it into inaction. If your focus from Size Up is within 30 feet of you, your focus must succeed at a Will save against your class DC or spell DC, whichever is higher, or be Stunned 1 (or Stunned 2 on a critical failure).

Regardless of the result, the target becomes temporarily immune to your Uncanny Prediction for 1 hour.