save_unique_holy_site_and_update_count_variable_for_tally_effect

save_unique_holy_site_and_update_count_variable_for_tally_effect = {
	#If this is our first holy site, set up the variable
	if = {
		limit = {
			#These two really shouldn't exist without each other, but safe-checking
			NOT = { exists = var:visited_unique_holy_sites_list }
			NOT = { exists = var:visited_unique_holy_sites_count }
		}
		#Create variables
		add_to_variable_list = {
			name = visited_unique_holy_sites_list
			target = $HOLY_SITE$
		}
		set_variable = {
	 		name = visited_unique_holy_sites_count
	 		value = 1
	 	}
	 	add_character_flag = added_new_holy_site
	}
	#Otherwise add the holy site if we don't already have it
	else_if = {
		limit = {
			#These two really shouldn't exist without each other, but safe-checking
			exists = var:visited_unique_holy_sites_count
			#Does this holy site exist in the list?
			any_in_list = {
				variable = visited_unique_holy_sites_list
				NOT = { this = $HOLY_SITE$ }
			}
		}
		#Add the holy site to the list
		add_to_variable_list = {
			name = visited_unique_holy_sites_list
			target = $HOLY_SITE$
		}
		#Count up the variable
		change_variable = {
			name = visited_unique_holy_sites_count
			add = 1
		}
		add_character_flag = added_new_holy_site
	}
}

As written in game/common/scripted_effects/00_pilgrimage_effects.txt.