Enchanted equipment is reason #2 mages are kept around. Not that it is given to rookies, since they have a very big chance to accidentally burn off those enchantments with careless use of Luminosity. And naturally, ruins of the old world contain many forgotten secrets. As for sigils, Lumes do know it, but it's reserved for higher ranking ones who actually have the capability to learn and use them. Some mages also know it, and luckily, they are important NPCs for the mage side.