Promote … Culture

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	highest_held_title_tier >= tier_duchy
	government_has_flag = government_is_nomadic
}
is_shown = scope:actor.domicile ?= {
	domicile_culture ?= scope:actor.culture
	domicile_uses_culture_and_faith = yes
}
scope:actor.culture ?= {
	OR = {
		is_divergent_culture = yes
		is_hybrid_culture = yes
	}
}
scope:recipient = {
	trigger_if = {
		limit = {
			domicile ?= {
				domicile_uses_culture_and_faith = yes
			}
		}
		domicile.domicile_culture != scope:actor.culture
	}
	trigger_else = {
		culture != scope:actor.culture
	}
	OR = {
		is_tributary_of_suzerain_or_above = scope:actor
		is_vassal_or_below_of = scope:actor
	}
}

As written in game/common/character_interactions/09_mpo_interactions.txt.

scope:recipient = {
	NOR = {
		is_imprisoned_by = scope:actor
		has_strong_hook = scope:actor
		is_at_war_with = scope:actor
	}
}
NOT = {
	custom_tooltip = {
		text = not_a_nomad_or_herder_tt
		scope:recipient = {
			NOT = {
				government_has_flag = government_is_in_steppe
			}
		}
	}
}
trigger_if = {
	limit = {
		exists = scope:recipient.domicile
	}
	custom_tooltip = {
		text = not_a_parent_culture_of_domicile_tt
		scope:actor.culture = {
			any_parent_culture_or_above = {
				this = scope:recipient.domicile.domicile_culture
			}
		}
	}
}
trigger_else = {
	custom_tooltip = {
		text = not_a_parent_culture_tt
		scope:actor.culture = {
			any_parent_culture_or_above = {
				this = scope:recipient.culture
			}
		}
	}
}

As written in game/common/character_interactions/09_mpo_interactions.txt.

on_accept = scope:actor = {
	send_interface_toast = {
		type = event_toast_effect_good
		title = promote_culture_accepted_tt
		left_icon = scope:recipient
		scope:recipient = {
			if = {
				limit = {
					domicile ?= {
						domicile_uses_culture_and_faith = yes
					}
				}
				custom_tooltip = {
					text = family_and_lands_convert_domicile_tt
					every_held_title = {
						limit = {
							tier = tier_county
							is_landless_type_title = no
							culture = scope:recipient.domicile.domicile_culture
						}
						add_to_list = counties_to_convert
					}
					every_close_or_extended_family_member = {
						limit = {
							is_courtier_of = scope:recipient
							culture = scope:recipient.domicile.domicile_culture
						}
						add_to_list = spouses_and_family_to_convert
					}
					domicile = {
						set_domicile_culture = scope:actor.culture
					}
				}
			}
			else = {
				custom_tooltip = {
					text = family_and_lands_convert_tt
					every_held_title = {
						limit = {
							tier = tier_county
							is_landless_type_title = no
							culture = scope:recipient.culture
						}
						add_to_list = counties_to_convert
					}
					every_close_or_extended_family_member = {
						limit = {
							is_courtier_of = scope:recipient
							culture = scope:recipient.culture
						}
						add_to_list = spouses_and_family_to_convert
					}
				}
			}
			if = {
				limit = {
					culture != scope:actor.culture
				}
				set_culture = scope:actor.culture
			}
			hidden_effect = {
				every_in_list = {
					list = counties_to_convert
					set_county_culture = scope:actor.culture
				}
				every_in_list = {
					list = spouses_and_family_to_convert
					set_culture = scope:actor.culture
				}
			}
			add_opinion = {
				modifier = respect_opinion
				opinion = 10
				target = scope:actor
			}
		}
	}
	if = {
		limit = {
			scope:prestige_send_option = yes
		}
		scope:actor = {
			add_prestige = scope:actor.minor_prestige_loss
		}
		scope:recipient = {
			add_prestige = scope:actor.minor_prestige_value
		}
	}
	if = {
		limit = {
			scope:herd_send_option = yes
		}
		scope:actor = {
			pay_herd = {
				target = scope:recipient
				value = domicile.minor_herd_value
			}
		}
	}
	if = {
		limit = {
			scope:hook = yes
		}
		use_hook = scope:recipient
	}
}
on_decline = scope:actor = { }

As written in game/common/character_interactions/09_mpo_interactions.txt.