avenge_the_battle_of_nahrawan_scripted_effect

avenge_the_battle_of_nahrawan_scripted_effect = {
		
	give_nickname = nick_the_avenger
	add_character_modifier = {
		modifier = fp3_azariqa_ascendancy_modifier 
	}

	add_prestige = massive_prestige_gain

	#Religious bonuses
	add_piety = major_piety_gain
	faith = {
		change_fervor = {
			value = medium_fervor_gain
			desc = fervor_gain_avenged_battle_of_nahrawan
		}
	}

	if = {
		limit = {
			any_vassal_or_below = {
				NOT = { 
					rite = { rite_has_doctrine = muhammad_succession_muhakkima_doctrine }
				}
				is_ai = yes
				capital_province ?= { 
					OR = {
						geographical_region = world_middle_east
						geographical_region = world_persian_empire 
					}
				}
			}
		}
		every_vassal_or_below = {
			custom = every_non_muhakkima_vassal_middle_east
			limit = {
				NOT = { 
					rite = { rite_has_doctrine = muhammad_succession_muhakkima_doctrine }
				}
				is_ai = yes
				capital_province ?= { 
					OR = {
						geographical_region = world_middle_east
						geographical_region = world_persian_empire 
					}
				}
			}
			random = {
				chance = 25
				set_character_faith = scope:avenger.faith
				set_character_rite = scope:avenger.rite
			}
		}
	}

	if = {
		limit = {
			any_realm_province = {
				NOT = { 
					rite = { rite_has_doctrine = muhammad_succession_muhakkima_doctrine }
				}
				OR = {
					geographical_region = world_middle_east
					geographical_region = world_persian_empire 
				}
			}
		}
		every_realm_province = {
			limit = {
				NOT = { 
					rite = { rite_has_doctrine = muhammad_succession_muhakkima_doctrine }
				}
				OR = {
					geographical_region = world_middle_east
					geographical_region = world_persian_empire 
				}
			}
			county = {
				add_to_list = every_realm_county
			}	
		}

		every_in_list = {
			list = every_realm_county
			custom = every_non_muhakkima_faith_county_middle_east	
			random = {
				chance = 25
				custom_tooltip = every_non_avenger_faith_convert
				hidden_effect = {
					set_county_faith = scope:avenger.faith
					set_county_rite = scope:avenger.rite
				}
			}
		}
	}

	if = {
		limit = { exists = scope:sunni_faith }
		scope:sunni_faith = {
			change_fervor = {
				value = medium_fervor_loss
				desc = fervor_loss_avenged_battle_of_nahrawan
			}
		}
	}
	if = {
		limit = { exists = scope:shia_faith }
		scope:shia_faith = {
			change_fervor = {
				value = medium_fervor_loss
				desc = fervor_loss_avenged_battle_of_nahrawan
			}
		}
	}
}

As written in game/common/scripted_effects/03_dlc_fp3_scripted_effects.txt.