mongol_invasion_county_looting_chance_effect

mongol_invasion_county_looting_chance_effect = {
	save_temporary_scope_as = county
	if = {
		limit = {
			NOR = {
				exists = var:looted_by_mongols
				holder = scope:attacker
			}
		}
		random = {
			chance = scope:attacker.martial
			# Each County should only be devastated once
			set_variable = {
				name = looted_by_mongols
				value = yes
			}
			# Send a message (and gold!) to the Mongol Emperor
			scope:attacker = {
				send_interface_message = {
					type = event_war_bad
					title = mongols_sieged_county.t
					left_icon = scope:county.holder
					right_icon = scope:county
					if = {
						limit = {
							scope:county.development_level >= 1
						}
						add_gold = {
							add = scope:county.development_level
							multiply = 5
						}
					}
					if = {
						limit = { dread < 150 }
						add_dread = 2
					}
				}
				save_scope_as = mongol_emperor
				# Send a message to the County's owner
				scope:county.holder = {
					send_interface_message = {
						type = event_war_bad
						title = mongols_sieged_county.t
						left_icon = scope:mongol_emperor
						right_icon = scope:county
						scope:county = { mongols_devastate_county_effect = yes }
					}
				}
			}
		}
	}
}

As written in game/common/scripted_effects/00_war_effects.txt.