decision_restore_carantania_effect

decision_restore_carantania_effect = {
	title:d_krain = { add_to_list = carantania_de_jure_list }
	title:d_carinthia = { add_to_list = carantania_de_jure_list }
	title:d_steyermark = { add_to_list = carantania_de_jure_list }
	title:d_carinthia.de_jure_liege = { save_scope_as = previous_kingdom }

	dynasty = { add_dynasty_prestige = monumental_dynasty_prestige_gain }
	create_title_and_vassal_change = {
		type = created
		save_scope_as = title_change
		add_claim_on_loss = no
	}
	title:k_carantania = {
		change_title_holder = {
			holder = root
			change = scope:title_change
		}
	}
	resolve_title_and_vassal_change = scope:title_change
	hidden_effect = {
		if = {
			limit = { exists = scope:previous_kingdom.de_jure_liege }
			title:k_carantania = {
				set_de_jure_liege_title = scope:previous_kingdom.de_jure_liege
			}
		}
	}

	if = {
		limit = {
			NOT = {
				any_in_list = {
					list = carantania_de_jure_list
					is_titular = yes
				}
			}
		}
		custom_tooltip = decision_restore_carantania_de_jure_regular_tooltip
		hidden_effect = {
			title:d_krain = { set_de_jure_liege_title = title:k_carantania }
			title:d_carinthia = { set_de_jure_liege_title = title:k_carantania }
			title:d_steyermark = { set_de_jure_liege_title = title:k_carantania }
		}
	}
	else = {
		every_in_list = {
			list = carantania_de_jure_list
			limit = {
				is_titular = no
			}
			set_de_jure_liege_title = title:k_carantania
		}
	}
	every_sub_realm_duchy = {
		limit = {
			NOR = {
				is_in_list = carantania_de_jure_list
			}
			any_title_to_title_neighboring_duchy = {
				is_in_list = carantania_de_jure_list
			}	
		}
		custom_tooltip = decision_restore_carantania_de_jure_tooltip
		hidden_effect = { set_de_jure_liege_title = title:k_carantania }
	}
	if = {
		limit = {
			capital_province.duchy = { is_in_list = carantania_de_jure_list }
			NOT = { title:k_carantania = root.capital_county }
		}
		root = { custom_tooltip = decision_restore_carantania_change_capital_tooltip }
		title:k_carantania = {
			set_capital_county = root.capital_county
		}
	}
	root.capital_county = {
		if = {
			limit = {
				NOT = {	culture = root.culture }
			}
			set_county_culture = root.culture 
		}
		add_county_modifier = {
			modifier = restore_carantania_modifier
			years = 100
		}
	}
}

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