Where did Yang Guo's epee come from in Jin Yong's novel The Condor Heroes?

In Jin Yong's novel "The Condor Heroes", Yang Guo's epee was obtained from the sword grave of solitary seeking defeat.

In order to rescue the little dragon girl in the Valley of Love, Yang Guo combined with the little dragon girl's double swords to fight with Gong Sunzhi. But was framed by GongSunZhi. Both he and the little dragon girl were poisoned by love flowers. At this time, Li Mochou took away Guo Xiang, the child of Huang Rong. Yang went after Li Mochou. As a result, they were all trapped in the cave by King Jinlong. Yang Guo met Wu Santong when he was out looking for food. Wu Santong's two sons are fighting for Guo Fu. Wu Santong wants Yang Guo to help them settle the dispute.

Yang Guo then found Dawu and Xiaowu. He told them that Guo Jing had betrothed Guo Fu to him. He made Dawu and Xiao Wu give up completely. As a result, the Wu brothers went to find it. He told Guo Fu what Yang Guo said. Guo Fu was very angry after hearing these words. She went straight to Yang Guo's theory. And insulted Little Dragon Girl in front of Yang Guo. Yang Guo was very angry after hearing this. He slapped Guo Fu. Guo Fu cut Yang Guo with his sword. As a result, Yang Guo was too weak because of the poison in his body. He has no strength to dodge. His arm was suddenly cut off by Guo Fu.

Yang Guo was heartbroken. He covered his wound and ran out. He ran into a romantic desert. At this moment, a big eagle flew to his side. He took Yang Guo to the cave, where he searched for failure alone. The eagle takes care of Yang Guo every day. After Yang Guo recovered from his injury, the eagle took Yang to the grave where he was lonely and defeated. There are three swords, one sword, one epee and one wood blade in front of the tombstone. At this time, the eagle put the epee in Yang Guo's hand. Yang Guo feels very hard. But he was still embarrassed to refuse the kindness of the eagle. In order to increase Yang Guo's strength, the great carver gave him snake gall every day. Eagle also fights with Yang Guo every day. The eagle also drove Yang Guo into the water and let him practice his sword in the water. Yang Guo's swordsmanship advanced by leaps and bounds with the help of the great sculptor.