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Through a lot of personal effort you have managed to strengthen your will and be less susceptible to mind-affects.

Requisites: Be at least clever (wisdom)

Benefit: You get a +2 in all your will saves

It might also due to have a good constitution.

Yup, although the main reason of having a wisdom requirement is to avoid that characters could take this feat and leaving their characters with average wisdom, eliminating any chance of min-maxing.