pam_antipope_challenge_hof_victory_effect

pam_antipope_challenge_hof_victory_effect = {
	pam_challenge_hof_war_save_participants_effect = yes
	scope:defender = {
		pam_challenge_hof_war_persist_scopes_effect = {
			OUTCOME = flag:attacker_victory
		}
	}
	# Set before he takes office: that title change is what fires the succession reaction
	if = {
		limit = {
			exists = scope:pam_ch_hof_challenger
			exists = scope:pam_ch_hof_sponsor
		}
		scope:pam_ch_hof_challenger = {
			set_variable = {
				name = challenger_sponsor
				value = scope:pam_ch_hof_sponsor
				days = 7
			}
		}
	}
	if = {
		limit = {
			scope:attacker = { pam_is_antipope_trigger = yes }
		}
		scope:attacker.faith = {
			every_religious_head_challenger = {
				limit = { holder ?= scope:attacker }
				challenger_sponsor ?= {
					holder ?= { save_scope_as = challenger_sponsor }
				}
			}
		}
		scope:attacker = {
			pam_antipope_become_hof_effect = { WINNER = scope:attacker }
		}
	}
	else_if = {
		limit = {
			scope:attacker = { pam_is_antipope_sponsor_trigger = yes }
		}
		scope:attacker = { save_scope_as = challenger_sponsor }
		scope:attacker.faith = {
			every_religious_head_challenger = {
				limit = {
					challenger_sponsor ?= { holder ?= scope:attacker }
				}
				holder ?= { save_scope_as = antipope_winner }
			}
		}
		if = {
			limit = { exists = scope:antipope_winner }
			pam_antipope_become_hof_effect = { WINNER = scope:antipope_winner }
			pam_antipope_sponsor_vassalize_hof_effect = { SPONSOR = scope:challenger_sponsor }
		}
	}
	# Only hold a judgment if the old Head of Faith actually lost the seat.
	if = {
		limit = {
			NOT = { scope:attacker.faith.religious_head ?= scope:defender }
		}
		pam_challenge_hof_war_on_attacker_victory_events_effect = yes
	}
}

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