Looking for the protagonist of the novel, Master Dugu Kendo's use of purple soft sword seems to be Jin Yong's novel.

Is to seek failure alone. He is a mysterious master who has never appeared directly in Jin Yong's novels. Legend has it that you can't seek defeat, hence the name "seeking defeat". For details, please refer to the dark iron swordsmanship learned by Yang Guo, the condor hero. The legendary swordsman's Zhongfeng Qing Yang inherited Ling Huchong's nine swords. His second weapon is the sword tomb of soft sword, Wei Zi, and the words "Wei Zi soft sword, used before the age of 30, accidentally injured the righteous man ominously, but abandoned the deep valley"