Kanshou and Bakuya are "married" twin swords representing yin and yang encountered by Archer at some point during his lifetime and added to the numerous weapons recorded and stored in Unlimited Blade Works. They are his favored weapons to project, having become his symbols after wielding them all his life. He and Shirou Emiya find the craftsmanship of the blades, rather than what they represent, to be extremely captivating and beautiful, and the swords suit their natural style of fighting. Despite not having a wielder in the legends, they are still Noble Phantasms crafted by the blacksmith Gān Jiàng, Kanshou, of Wu during the Spring and Autumn Period of China. They were crafted more for the sake of crafting, as if questioning the meaning of the swordsmith, than for any real idea behind their creation. They were created without vanity, and lack a sense of purpose found in other swords. They contain no fighting spirit to defeat others or competitive spirit to beat other weapons, and they contain neither the desire to be famous nor the faith to accomplish great deeds.