Frightful Presence

This special quality makes a creature's very presence unsettling to foes. Opponents within a range of 30 feet who witness the creature may become frightened or shaken for 5d6 rounds. This ability affects only opponents with fewer Hit Dice than the creature has. An opponent can resist the effects with a successful Will save. An opponent that succeeds on their saving throw is immune to that same creature's frightful presence for 24 hours. On a failed save, the opponent is shaken, or frightened if it has 4 Hit Dice or fewer. Frightful presence is a mind-affecting fear effect.