I Started with the Centurion, Drew His Sword and Slashed

[Traditional fantasy + Kendo + no system + no harem] In the vast universe, on top of the Great Wall, one sword cuts down hundreds of levels; The leader of a hundred men, holding a sword in his hand, cuts off all injustice in the world... A bridge dominates the change of eras in the universe. There was a voice asking from the other side of the bridge: "What is Tao?" Mu Xuan replied: "Tao is the sword in the hand." (I'm not very good at writing introductions. If you like reading fantasy novels, please move to the main text!)