Right now modifiers applied by devastation are additive, and their effect can be easily negated by stacking positive modifiers.
For example, province with 100% devastation can be supposed to have completely ruined production facilities, yet if you are production leader for that particular trade good, it now produces 10% of base goods instead of 0%. If you have stacked +100% goods produced, total modifier is 0%, so amount of goods produced is now a half of what non-devastated province (with +100%) would produce.
Other effects are also easily negated, for example severe penalty for manpower can be easily neutralized with "Increased Enlistment" state edict.
I suggest to make devastation effects multiplicative, similarly to local autonomy.
Of course, this change will also make effects of negative modifiers less impactful, for example "Lost Mandate of Heaven" in province with 50% devastation becomes equivalent to 75% of devastation instead of 100%. I think it's OK.
For example, province with 100% devastation can be supposed to have completely ruined production facilities, yet if you are production leader for that particular trade good, it now produces 10% of base goods instead of 0%. If you have stacked +100% goods produced, total modifier is 0%, so amount of goods produced is now a half of what non-devastated province (with +100%) would produce.
Other effects are also easily negated, for example severe penalty for manpower can be easily neutralized with "Increased Enlistment" state edict.
I suggest to make devastation effects multiplicative, similarly to local autonomy.
Of course, this change will also make effects of negative modifiers less impactful, for example "Lost Mandate of Heaven" in province with 50% devastation becomes equivalent to 75% of devastation instead of 100%. I think it's OK.
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