Ring of spellbattle

A ring of spellbattle (also spelled ring of spell-battle) was a gold ring inset with silver spheres and communicated to its wearer any spellcasting that occured within 60 feet (20m). If the wearer knew spellcraft, it was possible that he or she could identify the spell, even if he or she could not see it at all, and once per day, the ring could be commanded to cast dispel magic as a counterspell or change the target of the spell, but only to new targets within 60 feet (20m). Otherwise the redirection failed. The ring was worth around 70,000 gold pieces.