When Three Generations Meet, the World Collides into Two

The era of cultivation is a prosperous era of independent spiritual energy recovery. They are willing to die for the sake of the world and future generations. The era of redemption is an era of life and death that was forced to open up the wall. The spiritual energy suddenly slowly dissipated, and they managed to survive. So why is the spiritual energy of this era resurrected? What will happen when people from three eras meet? What kind of sparks will there be when the two worlds collide? How will the two worlds cope with powerful foreign enemies?