Physical Resistance Rating

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Formula for Calculating Soak-% from Physical Resistance Rating
(1 – (0.99^PRR)) × 0.65

Every 1 point of PRR reduces the amount of physical damage you would otherwise be taking by 0.65%.

1 PRR takes 0.65% less damage than 0 PRR.

2 PRR takes 0.65% less damage than 1 PRR and 1.29% less damage than 0 PRR.

See table below.

Bonuses from armor proficiency
Heavy Armor gives you Physical Resistance Rating equal to your Base Attack Bonus.

Medium Armor gives you Physical Resistance Rating equal to 2/3 of your Base Attack Bonus.

Light Armor gives you Physical Resistance Rating equal to 1/2 of your Base Attack Bonus.