Ring of Vengeance

This gold ring glows softly when worn by a good-aligned creature. If the wearer of the ring dies, an arc of divine energy leaps from the ring and deals 15d6 points of damage to the creature that dealt the killing blow. The damage is of divine origin and of a nonspecific energy type. The target of the attack can make a DC 19 Reflex save to reduce the damage by half. Once the ring unleashes its energy, it turns to dust.