norse_assimilate_local_traditions_effect

norse_assimilate_local_traditions_effect = {
	# Save the root character as a reference
	save_scope_as = converting_character
	# Save the old culture as a scope
	$OLD_CULTURE$ = {
		save_scope_as = old_culture
	}
	$NEW_CULTURE$ = {
		save_scope_as = new_culture
	}
	$OLD_FAITH$ = {
		save_scope_as = old_faith
	}
	$NEW_FAITH$ = {
		save_scope_as = new_faith
	}
	$CONVERTER$ = {
		save_scope_as = converter
	}
	add_character_modifier = {
		modifier = embraced_local_traditions_modifier
	}
	if = {
		limit = {
			dynasty ?= {
				NOT = {
					has_dynasty_modifier = settled_norse_dynasty_modifier
				}
			}
		}
		dynasty = {
			add_dynasty_modifier = { modifier = settled_norse_dynasty_modifier years = 80 }
		}
	}
	# Convert root character and AI close family members
	set_culture = scope:new_culture
	if = {
		limit = {
			NOR = {
				scope:old_faith = scope:new_faith
				has_trait = zealous
			}
		}
		hidden_effect = {
			bastard_to_wild_oat_conversion_assimilation_effect = yes
		}
		set_character_faith = scope:new_faith
	}
	if = {
		limit = {
			is_ai = yes
		}
		add_character_flag = converted_culture_this_lifetime_ai
	}
	else = {
		add_character_flag = converted_culture_this_lifetime
	}

	every_close_family_member = {
		custom = every_close_family_member_sharing_your_culture
		limit = {
			is_courtier_of = scope:converter
			# Only non-ruler same-culture characters
			has_culture = scope:old_culture
		}
		set_culture = scope:new_culture
		if = {
			limit = {
				NOR = {
					scope:old_faith = scope:new_faith
					has_trait = zealous
				}
			}
			hidden_effect = {
				bastard_to_wild_oat_conversion_assimilation_effect = yes
			}
			set_character_faith = scope:new_faith
		}
		hidden_effect = {
			add_character_modifier = {
				modifier = embraced_local_traditions_modifier
			}
		}
		add_to_temporary_list = notified_of_culture_change
	}
	every_consort = {
		#custom = every_consort_sharing_your_culture
		limit = {
			is_ruler = no
			has_culture = scope:old_culture
			NOT = { is_in_list = notified_of_culture_change }
		}
		set_culture = scope:new_culture
		if = {
			limit = {
				NOR = {
					scope:old_faith = scope:new_faith
					has_trait = zealous
				}
			}
			hidden_effect = {
				bastard_to_wild_oat_conversion_assimilation_effect = yes
			}
			set_character_faith = scope:new_faith
		}
		hidden_effect = {
			add_character_modifier = {
				modifier = embraced_local_traditions_modifier
			}
		}
		add_to_temporary_list = notified_of_culture_change
	}

	# All Norse vassals convert
	every_vassal = {
		custom = every_norse_vassal
		limit = {
			culture = scope:old_culture
			NOT = { is_in_list = notified_of_culture_change }
		}

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