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Chapter 8: Playing the Game / Checks / Step 3: Compare to DC

Getting a DC from a Modifier

Source Player Core pg. 401 2.0
When someone attempts a check against you, you might need to defend with one of your statistics that’s normally a modifier, such as your “Reflex DC.” Rather than rolling a check of your own, you need to generate a fixed DC based on your modifier. Your DC for a given statistic is 10 + the total modifier for that statistic. So if you have a +4 Reflex save, your Reflex DC is 14.