Needs review
Source: Dark Sun 3

Description: Your decisive attacks are especially frightening for those who watch.

Prerequisites: CHA 13, Improved Critical, Perform (5 ranks)

Whenever you confirm a critical hit, all enemies within a 10‐foot radius who have line of sight on you must make a Will save (DC 10 + 1/2 your character level + your Cha modifier) or become shaken for a number of rounds equal to your Cha modifier. This is a mind‐affecting fear effect.

Whether or not the save is successful, that creature cannot be affected again by the same character’s brutal attack for 24 hours.