Fear Aura (Su)
A fear aura either operates continuously or can be used at will. In either case, it’s a free action. This ability can freeze an opponent or cause opponents to become panicked. Other effects are possible. Negating the fear effect requires a successful Will save with a DC equal to 10 + 1/2 fearsome creature’s HD + fearsome creature’s Charisma modifier (the exact DC is given in the creature’s descriptive text).