pam_cardinal_vacancy_on_death_effect

pam_cardinal_vacancy_on_death_effect = {
	if = {
		limit = {
			has_pam_dlc_trigger = yes
			OR = {
				exists = clerical_elector_title
				has_character_flag = cardinal_flag
			}
			OR = {
				exists = faith.religious_head
				exists = title:k_papal_state.holder
			}
			faith = {
				has_doctrine_parameter = has_clerical_electors
				any_clerical_elector_title = { count < 10 }
			}
		}
		if = {
			limit = { exists = faith.religious_head }
			faith.religious_head = { save_scope_as = head_of_faith }
		}
		else = {
			title:k_papal_state.holder = { save_scope_as = head_of_faith }
		}
		if = {
			limit = {
				scope:head_of_faith = { is_ai = yes }
			}
			faith = {
				ordered_clerical_region_title = {
					limit = {
						holder ?= {
							is_alive = yes
							is_adult = yes
							is_incapable = no
							NOT = { has_trait = excommunicated }
							NOT = { exists = clerical_elector_title }
							this != scope:head_of_faith
							pam_can_hold_cardinalate_trigger = yes
							pam_pope_is_head_of_faith_or_rite_trigger = yes
							pam_ai_cardinal_candidate_is_immersive_trigger = yes
							pam_is_antipope_trigger = no
						}
					}
					order_by = holder.piety_level
					max = 1
					check_range_bounds = no
					holder = {
						save_scope_as = cardinal_candidate
						trigger_event = {
							id = pam_clergy_events.0040
							days = 3
						}
					}
				}
			}
		}
		else = {
			faith = {
				ordered_clerical_region_title = {
					limit = {
						holder ?= {
							is_ai = yes
							is_alive = yes
							is_adult = yes
							is_incapable = no
							NOT = { has_trait = excommunicated }
							NOT = { exists = clerical_elector_title }
							this != scope:head_of_faith
							pam_can_hold_cardinalate_trigger = yes
							pam_pope_is_head_of_faith_or_rite_trigger = yes
							pam_ai_cardinal_candidate_is_immersive_trigger = yes
							pam_is_antipope_trigger = no
						}
					}
					order_by = holder.piety_level
					max = 1
					check_range_bounds = no
					holder = {
						save_scope_as = cardinal_candidate
					}
				}
			}
			if = {
				limit = {
					exists = scope:cardinal_candidate
				}
				scope:head_of_faith = {
					trigger_event = {
						id = pam_clergy_events.0041
						days = 3
					}
				}
			}
		}
	}
}

As written in game/common/scripted_effects/pam_effects.txt.