Bladeproof skin
( Unearthed Arcana, p. 92)[Spelltouched]
Your skin has a degree of protection from even the sharpest edge.
Prerequisite
Exposure to stoneskin or iron body spell,
Benefit
You gain damage reduction 3/bludgeoning. Your skin imposes an armor check penalty of -2 (which stacks with the armor check penalty from armor and shield).