Quote:
Originally Posted by Anders
A -5% decrease per -1 to Turning seems reasonable. Scales nicely with -1 Will (True Faith Only, -80%) [1].
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Canonically, Hard to Use (GURPS Powers, p. 107) is what you'd go for here. Each -3 to skill is worth -5%. That said, -5% might make sense as a special case for this one particular trait.