Adopt Mandala Government

is_landed = yes
highest_held_title_tier > tier_barony
has_mandala_culture_trigger = yes
NOT = {
	government_has_flag = government_is_mandala
}
trigger_if = {
	limit = {
		is_tributary = yes
	}
	NOT = {
		overlord = {
			government_has_flag = government_is_mandala
		}
	}
}
trigger_if = {
	limit = {
		government_has_flag = government_is_celestial
	}
	NOT = {
		has_title = title:h_china
	}
}
has_tgp_dlc_trigger = yes

As written in game/common/decisions/dlc_decisions/tgp/tgp_east_asia_decisions.txt.

trigger_if = {
	limit = {
		has_legitimacy = yes
		dynasty ?= {
			NOT = {
				has_dynasty_perk = tgp_sea_legacy_3
			}
		}
	}
	legitimacy_level >= 4
}
has_mandala_faith_trigger = yes
is_independent_ruler = yes
OR = {
	any_realm_province = {
		OR = {
			custom_tooltip = {
				text = convert_to_mandala_government_decision_is_temple_citadel_holding_tt
				has_holding_type = temple_citadel_holding
			}
			custom_tooltip = {
				text = convert_to_mandala_government_decision_has_no_holding_tt
				has_holding = no
			}
		}
	}
	any_directly_owned_province = {
		custom_tooltip = {
			text = convert_to_mandala_government_decision_is_tribal_holding_tt
			has_holding_type = tribal_holding
		}
	}
}
custom_tooltip = {
	text = not_changed_government_recently_tt
	NOT = {
		has_variable = changed_government_recently
	}
}
government_is_japanese_trigger = no

As written in game/common/decisions/dlc_decisions/tgp/tgp_east_asia_decisions.txt.

gok_government_change_story_end_effect = yes
change_to_mandala_government_decree_effect = yes
set_variable = {
	name = not_subject_to_succession_trials
	value = flag:adopted_mandala_government
}
if = {
	limit = {
		var:not_subject_to_succession_trials ?= flag:adopted_mandala_government
	}
}
show_as_tooltip = {
	change_government = mandala_government
}
if = {
	limit = {
		has_variable = vying_for_mandala_divinity
	}
	custom_description_no_bullet = {
		text = because_of_your_divine_happenstance_tt
	}
	show_as_tooltip = {
		divine_happenstance_adopt_mandala_effect = yes
	}
}
if = {
	limit = {
		culture = {
			has_cultural_parameter = mandala_tributaries
		}
		exists = confederation
	}
	custom_tooltip = confederates_to_tributaries_tt
}
trigger_event = tgp_east_asia_decision_events.0010
hidden_effect = {
	every_vassal = {
		trigger_event = {
			id = tgp_east_asia_decision_events.0015
			days = 3
		}
	}
}

As written in game/common/decisions/dlc_decisions/tgp/tgp_east_asia_decisions.txt.