tgp_save_bloc_leaving_reason_effect

tgp_save_bloc_leaving_reason_effect = {
	$LEAVING_HOUSE$ = { save_temporary_scope_as = leaver_temp }
	$INVITING_HOUSE$ = { save_temporary_scope_as = inviter_temp }
	scope:leaver_temp = {
		if = {
			limit = { NOT = { has_variable = bloc_leaving_reason } }
			if = {
				limit = {
					house_head ?= { is_ai = no }
				}
				set_variable = {
					name = bloc_leaving_reason
					value = flag:reason_player
					days = 4
				}
			}
			else_if = {
				limit = { exists = house_confederation.leading_house.house_head }
				house_confederation.leading_house.house_head = { save_scope_as = prev_bloc_leader }
				if = { # PRESTIGE LEVEL
					limit = { 
						OR = {
							house_head.prestige_level > scope:prev_bloc_leader.prestige_level
							scope:inviter_temp.house_head.prestige_level > scope:prev_bloc_leader.prestige_level
						}
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_prestige
						days = 4
					}
				}
				else_if = { # INFLUENCE LEVEL
					limit = {
						OR = {
							house_head.influence_level > scope:prev_bloc_leader.influence_level
							scope:inviter_temp.house_head.influence_level > scope:prev_bloc_leader.influence_level
						}
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_influence
						days = 4
					}
				}
				else_if = { # MILITARY POWER
					limit = {
						OR = {
							house_head.military_power > scope:prev_bloc_leader.military_power
							scope:inviter_temp.house_head.military_power > scope:prev_bloc_leader.military_power
						}
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_military_strength
						days = 4
					}
				}
				else_if = { # INVITER OPINION
					limit = {
						this != scope:inviter_temp
						house_head = {
							opinion = {
								target = scope:inviter_temp.house_head
								value >= 40
							}
						}
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_inviter_bloc_opinion
						days = 4
					}
				}
				else_if = { # PREV LEADER OPINION
					limit = {
						house_head = {
							opinion = {
								target = scope:prev_bloc_leader
								value < 0
							}
						}
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_current_bloc_opinion
						days = 4
					}
				}
				else_if = { # DYNASTY
					limit = {
						this != scope:inviter_temp
						house_head.dynasty = scope:inviter_temp.house_head.dynasty
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_dynasty
						days = 4
					}
				}
				else_if = { # ASPIRATIONS
					limit = {
						NOT = { has_same_house_aspiration_as = scope:prev_bloc_leader.house }
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_aspirations
						days = 4
					}
				}
				else_if = { # COHESION
					limit = {
						house_confederation ?= { cohesion <= 25 }
					}
					set_variable = {
						name = bloc_leaving_reason
						value = flag:reason_cohesion
						days = 4
					}
				}

As written in game/common/scripted_effects/10_dlc_tgp_house_bloc_scripted_effects.txt.