Deformity (Madness)( Elder Evils, p. 13)
You revel in madness, embracing your hallucinations, erratic behavior, and deviant cravings. Your mind cannot be touched by outside influences.
Willing Deformity (HH) ,
Reflexive Psychosis (EE) ,
You take a permanent —4 profane penalty to your Wisdom score to become immune to all mind-affecting spells and abilities.
As an immediate action, you can derive clarity from your madness to add a bonus equal to one-half your character level to a single Will save. Make this decision before determining the results of the saving throw. You must wait 1 minute before you can take this action again.