The Seven Arcs are the famous 7 Enhanced Armaments, each representing a star of the Ursa Major/Big Dipper. Some of it are currently in possession of some of the Kings. They are all known to be originated from the Unlimited Neutral Field. Their name are taken from Eastern Asia star names in "Seven Stars of the Northern Ladle", or in English, "Big Dipper". First four of them are originally placed in the deepest part of four underground dungeon located to the N/S/E/W of the forbidden city, with the remaining more powerful three stored inside it.