mpo_war_vassal_tributary_effect

mpo_war_vassal_tributary_effect = {
	create_title_and_vassal_change = {
		type = conquest
		save_scope_as = change
		add_claim_on_loss = yes
	}

	every_in_list = {
		list = target_titles
		if = {
			limit = {
				tier >= tier_county
			}
			every_de_jure_county = {
				limit = {
					holder = {
						OR = {
							this = scope:defender
							top_liege = scope:defender
							top_suzerain ?= scope:defender
						}
					}
				}
				holder ?= {
					add_to_list = target_holder
				}
				add_to_list = titles_taken
			}
		}

		holder ?= {
			add_to_list = target_holder
			save_scope_as = temp_de_jure_liege
		}
		add_hook_from_temp_de_jure_liege_to_attacker = yes
	}

	every_in_list = {
		list = titles_taken
		add_to_list = prestige_gain_list
	}

	ordered_in_list = {
		list = titles_taken
		order_by = tier
		max = 1
		save_scope_as = war_goal_title
	}

	every_in_list = {
		list = target_holder
		save_scope_as = current_target_holder
		if = {
			limit = {
				NOT = {
					any_held_county = {
						is_landless_type_title = no
						NOT = { is_in_list = titles_taken }
					}
				}
				NOR = {
					this = scope:attacker
					top_liege = scope:attacker
					top_suzerain ?= scope:attacker
				}
				highest_held_title_tier <= scope:war_goal_title.tier
			}
			if = {
				limit = {
					scope:attacker.vassal_count >= vassal_limit
				}
				start_tributary_from_war_effect = {
					TRIBUTARY = scope:defender
					SUZERAIN = scope:attacker
					WAR = $WAR$
				}
				#If you tributarize a confederate, they leave their confederation
				if = {
					limit = {
						scope:defender = {
							is_confederation_member = yes
						}
					}
					scope:defender.confederation = {
						remove_confederation_member = scope:defender
					}
				}
			}
			else = {
				change_liege = {
					liege = scope:attacker
					change = scope:change
				}
			}
			every_in_list = {
				list = titles_taken
				limit = {
					holder ?= scope:current_target_holder
				}
				remove_from_list = titles_taken
			}
		}
	}

	every_in_list = {
		list = titles_taken
		limit = {
			holder ?= {
				NOR = {
					this = scope:attacker
					any_liege_or_above = { this = scope:attacker }
					top_suzerain ?= scope:attacker
				}
			}
		}
		change_title_holder = {
			holder = scope:attacker
			change = scope:change
		}
		remove_from_list = target_titles

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