A great disaster later known as the Great Dark Age fell upon the world a hundred years ago. Cities collapsed, and a large number of humans perished. The few surviving humans gathered in large human bases, the only safe refuge against the invading Otherworlders. When everyone was about to lose hope of survival, ancient martial arts were uncovered and proved effective against the Otherworlders.
Xu Renli was a genius Martial Cultivator who fought on the frontlines against the Otherworlders. One day, he was ambushed and severely injured by a group of high-level Otherworlders, which caused his cultivation realm to drop by three major realms. This caused him to live a simple life in the mountains, far away from the war.
All hope was not lost for him regaining his cultivation because he awakened the Grandmaster System when he settled down on the mountain a year ago. This miraculous system will help him cultivate when he recruits and trains disciples. This will be the key to his return to the battlefield and help him investigate the real mastermind behind his ambush.