You touch a nonflammable object, such as an iron or plowshare, which begins to glow red-hot. The object can be safely touched and handled, but any creature who knowingly tells a lie while in contact with the object must make a Charisma saving throw or else be burned by it, taking 3d6 fire damage immediately and again any time it starts its turn in contact with the object or touches the object on its turn before the spell ends.