Year One of the Tianyuan Calendar: Dimensions merge, and countless worlds appear. Earth expands a hundredfold under the influence of an unknown force, and human civilization makes official contact with all kinds of mysteries. Vampires, gods, demons, and other races once thought to exist only in the imagination step onto the stage. This is a new beginning, and the start of a disaster.
Compared to the other races, humans are simply too weak. The power of technology seems like nothing more than a collection of toys to them. Even mid-level demons and vampire counts can ignore human nuclear technology, to say nothing of high-level demons, demon generals, demon kings, vampire marquises and dukes, or even true ancestors...
Then the appearance of a quantum device gives humanity a chance to turn things around.
"Bro, who were you in your past life? I'm telling you, I was Huang Chao!"
"Ahem. I was Guan Yunchang."
"Hey, what a coincidence, bro. I was Lu Meng."