I Established the Medical Profession and Stirred up Troubles in the Wilderness

The middle prehistoric world. The two Lich clans were preparing to start a battle, when suddenly a figure appeared in the center of the battlefield. "Let me introduce myself. My name is Mu Fan. I come from the human race in the world under the rule of the Sea of Chaos Demon Slayer." "In order to join the Chaos Sea Demon Slayer Division, I came to the middle-end prehistoric world for a test." Mu Fan glanced at the two Liches around him, with a disdainful smile on his face, and said: "It's not that I look down on you, I just want to say that everyone here is scum!" Zhoutian Xingdou Formation and Dutian Shensha Formation pressed towards Mu Fan without saying a word. "Trash!" Mu Fan sneered and raised his sword finger. "I thought, three thousand swords." Three thousand sword intentions appeared out of thin air behind Mu Fan, and then formed a demon-slaying sword formation to kill Zhoutian Xingdou Formation and Dutian Shensha Formation... (This introduction is adapted from a certain plot in the book, please read the book for details)