Swing the Scales of Power

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	OR = {
		AND = {
			is_diarch = yes
			diarch_loyalty < diarch_loyalty_visibly_loyal_threshold
		}
		AND = {
			has_active_diarchy = yes
			OR = {
				can_leave_diarchy_trigger = yes
				has_diarchy_active_parameter = regency_cant_be_ended_above_this_point
			}
		}
	}
}
is_playable_character = yes
is_shown = OR = {
	scope:actor = {
		is_diarch_of_target = scope:recipient
	}
	scope:recipient = {
		is_diarch_of_target = scope:actor
	}
}

As written in game/common/character_interactions/00_diarch_interactions.txt.

trigger_if = {
	limit = {
		scope:actor = {
			is_diarch_of_target = scope:recipient
		}
	}
	custom_tooltip = {
		text = swing_scales_currency_interaction.tt.scales_max_swung
		scope:recipient.diarchy_swing < 100
	}
}
trigger_if = {
	limit = {
		NOT = {
			scope:actor = {
				has_diarchy_active_parameter = liege_may_voluntarily_cede_authority
			}
		}
		scope:recipient = {
			is_diarch_of_target = scope:actor
		}
	}
	custom_tooltip = {
		text = swing_scales_currency_interaction.tt.scales_max_swung
		scope:actor.diarchy_swing > 0
	}
}
scope:actor = {
	is_imprisoned = no
	age >= 8
}
trigger_if = {
	limit = {
		scope:actor = {
			is_ai = no
		}
	}
	custom_tooltip = {
		text = interactions_general.tt.must_select_one_option
		OR = {
			scope:swing_influence = yes
			scope:swing_cede_authority = yes
			scope:swing_prestige = yes
			scope:swing_piety = yes
			scope:swing_gold = yes
			scope:swing_hook = yes
			scope:swing_hof = yes
		}
	}
}
scope:actor = {
	trigger_if = {
		limit = {
			is_diarch_of_target = scope:recipient
			is_adult = no
		}
		age >= 8
	}
}
NOT = {
	scope:actor = {
		is_at_war_with = scope:recipient
	}
}

As written in game/common/character_interactions/00_diarch_interactions.txt.

on_accept = scope:recipient = {
	if = {
		limit = {
			scope:swing_cede_authority = yes
		}
		send_interface_message = {
			type = msg_mandate_results_neutral_effect
			title = swing_scales_interaction_by_liege.t
			right_icon = scope:actor
			scope:actor = {
				if = {
					limit = {
						has_diarchy_active_parameter = lieges_swing_more_against_diarchs
						has_perk = power_at_home_perk
						is_travelling = yes
					}
					update_diarchy_swing_with_perspective_effect = {
						SWING = monumental_sop_swing_diarch_gain
						LIEGE = scope:actor
					}
				}
				else_if = {
					limit = {
						OR = {
							has_diarchy_active_parameter = lieges_swing_more_against_diarchs
							AND = {
								has_perk = power_at_home_perk
								is_travelling = yes
							}
						}
					}
					update_diarchy_swing_with_perspective_effect = {
						SWING = massive_sop_swing_diarch_gain
						LIEGE = scope:actor
					}
				}
				else = {
					update_diarchy_swing_with_perspective_effect = {
						SWING = major_sop_swing_diarch_gain
						LIEGE = scope:actor
					}
				}
				diarch_swing_scales_guts_effect = yes
				change_influence = {
					value = 200
					multiply = legitimacy_regent_swing_scale_multipler_value
					round = yes
				}
				scope:recipient = {
					change_influence = {
						value = 200
						multiply = legitimacy_regent_swing_scale_multipler_value
						round = yes
					}
				}
			}
		}
	}
	else_if = {
		limit = {
			is_diarch_of_target = scope:actor
		}
		send_interface_message = {
			type = msg_mandate_results_bad_effect
			title = swing_scales_interaction_by_liege.t
			right_icon = scope:actor
			scope:actor = {
				if = {
					limit = {
						has_diarchy_active_parameter = lieges_swing_more_against_diarchs
						has_perk = power_at_home_perk
						is_travelling = yes
					}
					update_diarchy_swing_with_perspective_effect = {
						SWING = massive_sop_swing_liege_gain
						LIEGE = scope:actor
					}
				}
				else_if = {
					limit = {
						OR = {
							has_diarchy_active_parameter = lieges_swing_more_against_diarchs
							AND = {
								has_perk = power_at_home_perk
								is_travelling = yes
							}
						}
					}
					update_diarchy_swing_with_perspective_effect = {
						SWING = major_sop_swing_liege_gain
						LIEGE = scope:actor
					}
				}
				else = {
					update_diarchy_swing_with_perspective_effect = {
						SWING = medium_sop_swing_liege_gain
						LIEGE = scope:actor
					}
				}
				diarch_swing_scales_guts_effect = yes
			}
		}
	}
	else = {
		send_interface_message = {
			type = msg_mandate_results_bad_effect
			title = swing_scales_interaction_by_diarch.t
			right_icon = scope:actor
			if = {
				limit = {
					scope:actor = {
						has_perk = power_at_home_perk
						is_travelling = yes
					}
				}
				update_diarchy_swing_with_perspective_effect = {
					SWING = major_sop_swing_diarch_gain
					LIEGE = scope:recipient
				}
			}
			else = {
				update_diarchy_swing_with_perspective_effect = {
					SWING = medium_sop_swing_diarch_gain
					LIEGE = scope:recipient
				}
			}
			scope:actor = {
				diarch_swing_scales_guts_effect = yes
			}
		}
	}
}
scope:recipient = {
	if = {
		limit = {
			scope:swing_cede_authority = yes
		}
		if = {
			limit = {
				OR = {
					NOT = {
						has_variable = diarch_authority_ceded
					}
					var:diarch_authority_ceded < diarch_authority_ceded_opinion_value
				}
			}
			save_scope_value_as = {
				name = opinion_gain
				value = {
					value = diarch_authority_ceded_opinion_value
					if = {
						limit = {
							has_variable = diarch_authority_ceded
						}
						subtract = var:diarch_authority_ceded
					}
				}
			}
			add_opinion = {
				target = scope:actor
				modifier = pleased_opinion
				opinion = scope:opinion_gain
			}
			increment_variable_effect = {
				VAR = diarch_authority_ceded
				VAL = 5
			}
		}
		else = {
			add_opinion = {
				target = scope:actor
				modifier = pleased_opinion
				opinion = 1
			}
		}
	}
	else_if = {
		limit = {
			OR = {
				AND = {
					scope:actor = {
						is_diarch_of_target = scope:recipient
					}
					scope:recipient = {
						has_diarchy_active_parameter = diarchy_is_co_rulership
					}
				}
				AND = {
					scope:recipient = {
						is_diarch_of_target = scope:actor
					}
					scope:actor = {
						has_diarchy_active_parameter = diarchy_is_co_rulership
					}
				}
			}
		}
		add_opinion = {
			target = scope:actor
			modifier = frustrated_opinion
			opinion = -20
		}
	}
	else = {
		add_opinion = {
			target = scope:actor
			modifier = frustrated_opinion
			opinion = -10
		}
	}
}
ai_diarch_check_to_see_if_should_launch_coup_effect = yes
if = {
	limit = {
		exists = scope:recipient.diarch
		scope:actor = scope:recipient.diarch
	}
	debug_log = debug_log.swing_scales.diarch_swung
	scope:actor = {
		diarch_interaction_set_or_update_global_variable_effect = {
			VARIABLE = di_track_swung_diarch
		}
		diarch_interaction_add_to_global_list_effect = {
			VARIABLE_LIST = di_track_swung_diarch_list

# … (cut here; the rest is in the file)

As written in game/common/character_interactions/00_diarch_interactions.txt.