Anti-Magic Ring

A mysterious ring engraved with bizarre shapes and the heads of wizards, a gray gem is in the center of it... For some reason, you feel it cringing at you...

Roll a d6 if a spellcasting class is nearby, if the result is a 1, 3, or 5, the ring will hurl an insult at the closest spellcaster (including the wearer if they are a spellcaster) that will hit to home, they must roll a charisma save of 13 + the spell mod of the wearer. If the target of the insult fails the save, they will attack indiscriminately anyone nearby and gain an extra d6 to any damaging spell or attack.