Disaster Invasion

The end of the world, which I thought would never happen, turns out to have already begun. Humanity has been invaded by four evil tribes for 10 years without even realizing it The arrival of the system reveals the cruelty and ruthlessness of the end of the world Last parallel world Human beings are late every step and every step wrong. The four evil tribes will eventually destroy mankind This time, at the prompt of the system Uncover the apocalypse in advance, prepare for and save the world in advance Let mankind counterattack the four evil races Complex human nature, alien villains, and the identity of the system Everything seems not to be as simple as the end of the world I am new to the book and want to write my own story. I hope you can give me some advice. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.