Invincible: My System Will Be Upgraded

Traveling through the world of immortality, Hong Yuan obtained the system and spent three hundred years to become a Mahayana monk, invincible in the world. I thought I could finally lie down, but I found that a hundred years later, in the ancient continent, the world had changed drastically, the spiritual energy disappeared, and the monks withered. The declining human race was no longer able to resist foreign invasions and was gradually being enslaved and eaten away. [An abnormality in the host environment has been detected. Do you want to upgrade the system? [Congratulations to the host, the system has been successfully upgraded to version 2.0: The killing version! [After identification, the host is in the Qi refining stage...] "I'll go, I'm in the Mahayana stage!!!" And he is the only powerful venerable person left in the human race. Gods and demons dare to enslave hundreds of millions of my people, and I will trample you under my feet; Dark royal family, if you dare to feed on humans, I will put you on the barbecue grill; The prehistoric monster clan dares to keep humans as pets. Haha, I just need a few Mahayana monsters as pets... Everything that prevents me from lying down and enjoying life is my life and death enemy!