The Ring of Gyges is an artifact which was created by a long forgotten Immortal who was petitioning for godhood. It is a small iron ring with three sharp points. Placing the ring on one’s finger activates the ring, making the wearer invisible. The person wearing the ring vanishes from sight, even from darkvision. If the wearer is a creature carrying gear, that vanishes, too.
Items dropped or put down by an invisible wearer become visible; items picked up disappear if tucked into the clothing or pouches worn by the wearer of the ring. Light, however, never becomes invisible, although a source of light can become so (thus, the effect is that of a light with no visible source).