Twelve Swords of the River of Stars are North River’s living items. North River had started to forge these swords when he was still in the Fourth Stage Realm, and when he reached the Fifth Stage Realm, he had managed to forge only two of them. During his battle with Copper Trigram at the Forbidden City, North River has completed all twelve.
This magical treasure was composed of twelve sword orbs, and the materials used to forge each sword orb were different. Since the materials used to forge each sword orb were different, their properties were also different. Some had cold properties, other fire properties, and others again were just very sharp or could conduct electricity.