Deformity (Gaunt)( Book of Vile Darkness, p. 48)
Through intentional starvation and macabre operations, the character is grossly underweight.He has a skeletal appearance, and his weight is now half normal for creatures of his kind.
Willing Deformity (BoVD) ,
The character gains a +2 deformity bonus to Dexterity and a -2 deformity penalty to Constitution. Furthermore, he gains a +2 circumstance bonus on Escape Artist checks and Intimidate checks.
A character with this feat may not take the Deformity (obese) feat.