Unyielding Soul (3.5e Feat)
From D&D Wiki
Unyielding Soul [general]
You can turn assaults on your mind into assaults on the body.
Prerequisite: 4th level, Base attack bonus +2, Iron Will, Con 13+, Cha 13+, Indomitable
Benefit: When you would be affected by a mind-influencing spell or effect, you can choose to take physical damage instead, equal to 1d8 hit points per spell level of the effect. This damage is automatic and not subject to DR or SR. You may use this feat a number of times per day equal to your level divided by 4. You may not use this feat if you are flat-footed or under the influence of a fear effect. You may choose to use this feat after all your other defenses have been exhausted (SR, saving throws, possible rerolls, etc).