Fell Frighten

 
Prerequisite(s): Spellcaster.
 
Benefit: You can alter a spell that deals damage to foes so that any creature subject to fear effects and mind-affecting spells and abilities that is dealt damage also becomes shaken for 1 minute. A fell frightening spell uses up a spell slot two levels higher than the spell's actual level.
 
 
Source: Libris Mortis: The Book of the Dead