pam_challenge_hof_defeat_cleanup_effect

pam_challenge_hof_defeat_cleanup_effect = {
	if = {
		limit = { exists = scope:pam_ch_hof_challenger }
		scope:pam_ch_hof_challenger = { pam_strip_antipope_office_effect = yes }
	}
	else_if = {
		limit = {
			scope:attacker = { pam_is_antipope_trigger = yes }
		}
		scope:attacker = { pam_strip_antipope_office_effect = yes }
	}
	scope:attacker = { add_piety = major_piety_loss }
	scope:defender = {
		add_piety = major_piety_gain
		add_legitimacy_effect = { LEGITIMACY = medium_legitimacy_gain }
	}
	if = {
		limit = {
			exists = scope:pam_ch_hof_sponsor
			exists = scope:pam_ch_hof_challenger
			NOT = { scope:pam_ch_hof_sponsor = scope:pam_ch_hof_challenger }
			scope:pam_ch_hof_sponsor = { exists = house }
		}
		scope:pam_ch_hof_sponsor.house = {
			add_house_modifier = {
				modifier = pam_house_schismatic_sponsor_modifier
				years = 20
			}
		}
	}
	pam_antipope_removed_catalyst_effect = yes
}

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