Dreadful Wrath

When you charge, make a full attack, or cast a spell that either targets an enemy or includes an enemy in its area, you gain the frightful presence ability for that round. Each enemy within a 20-foot radius of you must succeed on a Will save (DC 10 + 1/2 your character level + your Cha modifi er) or be shaken for 1 minute. Regardless of its success or failure on the saving throw, any creature exposed to this effect is immune to your frightful presence for the next 24 hours. This is an extraordinary morale effect.