Fear attacks can have various effects.

Fear Aura (Su) The use of this ability is a free action. The aura can freeze an opponent (as in the case of a mummy's despair) or function like the fear spell. Other effects are possible. A fear aura is an area effect. The descriptive text gives the size and kind of the area.

Fear Cone (Sp) and Ray (Su) These effects usually work like the fear spell.

If a fear effect allows a saving throw, it is a Will save (DC 10 + 1/2 fearsome creature's racial HD + creature's Cha modifier; the exact DC is given in the creature's descriptive text). All fear attacks are mind-affecting fear effects.

Format: fear aura (30 ft., DC 17); Location: Aura.

Format: fear cone (50 ft., DC 19); Location: Special Attacks.