Abominable Form

 
Prerequisite(s): Willing Deformity
 
Benefit: Living creatures with fewer Hit Dice than you that can see your undisguised form are afflicted by disgust. Each such creature must succeed on a Will save (DC 15 + 2 for each deformity feat you possess) or become shaken for a number of rounds equal to your Constitution modifier (minimum 1 round).
 
Source:Elder Evils