Abominable Form
(Elder Evils, page 11, DnD 3.5)
[Vile, Deformity]
You revel in the ruination of your flesh, drawing power from your disturbing deformities.
Prerequisite
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).
Special
Your ghastly appearance grants you a +2 circumstance bonus on Intimidate checks.