mpo_abuse_authority_county_effect

mpo_abuse_authority_county_effect = {
	location.duchy = {
	    every_de_jure_county = {
	        limit = {
	            county_ready_for_abuse_trigger = yes
	        }
	        change_county_fertility = -100
	        change_county_control = -40
	        add_county_modifier = {
		    	modifier = mpo_paiza_abused_county_modifier
		    	years = 4
		    }
			add_to_temporary_list = counties_to_abuse
	    }
		every_de_jure_county = {
			limit = {
	            county_ready_for_abuse_trigger = yes
	        }
			holder = {
	            add_opinion = {
	                modifier = angry_opinion
	                target = root
	                opinion = -30
	            }
	        }
		}
		every_de_jure_county = {
			limit = {
	            county_ready_for_abuse_trigger = yes
	        }
			custom = custom.mpo_resources_gained_abuse
			root.domicile ?= {
	            change_herd = medium_herd_value
	        }
	        root = {
	            add_gold = medium_gold_value
	            add_prestige = medium_prestige_value
	        }
		}
	}
}

As written in game/common/scripted_effects/09_dlc_mpo_scripted_effects.txt.