Improved Mutation Resistance

The character is not only resistant to the effects of mutagens, but can actually recover from the genetic damage cause by exposure to mutating agents.
Prerequisites: Constitution 15, Great Fortitude, Mutation Resistance.
Benefit: Characters who possess this feat gain a +4 bonus on all Fortitude saves against mutation effects, to survive genetic surgery, and all other saves related to healing damage incurred from a failed Fortitude save versus mutation. Its effects stack with Mutation Resistance and Great Fortitude.
Special: Pure-strain humans may purchase Improved Mutation Resistance without meeting the prerequisites listed for this feat.