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One of the symptoms of an approaching nervous breakdown is the belief that one's work is terribly important
It adds effective dexterity I believe, makes you slightly dodgier against adventurer attacks. It also decreases denizen damage quite significantly (is it 10 or 12% at transcendant?) @Sena will know.
So by my (not reliable) math skills that means I should have taken about 1965 damage without avoidance?
Results of disembowel testing | Knight limb counter | GMCP AB files