I Sent You to Guard the Border, but You Challenge Three Thousand Worlds Alone?

Highly recommended by the editor-in-chief, the system is refreshing and passionately upgraded. Traveling through the fantasy world, activating the system, and guarding the world can be upgraded infinitely. There are all kinds of cultivation techniques and magical treasures! I just want to practice and upgrade, I have no interest in anything else. However, the system is too stupid, and the task assigned to me is to challenge three thousand worlds alone? There is no problem in single combat, but these three thousand worlds are so bad, I can kill them all with one move. The ancestor of the Immortal Sect was shocked: "You melon boy, I asked you to defend the boundary, and you crushed the three thousand worlds, this..." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.