pam_negotiate_land_piety_effect

pam_negotiate_land_piety_effect = {
	if = {
		limit = {
			pam_negotiate_land_forced_piety_level_trigger = yes
		}
		if = {
			limit = {
				scope:recipient.piety_level = 0
			}
			add_piety_experience = major_piety_loss
			scope:recipient = { add_piety_experience = massive_piety_loss }
		}
		else = {
			add_piety_experience = massive_piety_loss
			scope:recipient = { add_piety_level = -1 }
		}
	}
	else = {
		add_piety_level = -1
		scope:recipient = { add_piety_level = -2 }
	}
}

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