Chun-tzu said:I wouldn't say the feat is stupid, just a bit unbalanced. Sounds like a really cool epic (or at least high-level) feat. Just up the pre-reqs.
p. 92 - The feat Tough as Nails will do damage to a character attacking unarmed, such as a monk's unarmed strike ability.
p. 92 - The feat Tough as Nails will not damage weapons of masterwork quality or magically enhanced weapons.