Re: GURPS Power-Ups 9: Alternate Attributes
Use the Stress sand Derangement rules from GURPS Horror (pp.141–142) as your starting point, but have Sanity substitute for Will where Sanity-Blasting Fright Checks are concerned; possibly just call them Sanity Checks. In that system, you don't “lose Sanity”; you build Derangement until it overwhelms you.
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