A Divine Emperor transmigrates into the body of a primitive savage. His cultivation is completely gone, and all he can do is enter people's dreams and weave new ones.
No problem. He teaches farming in dreams and passes on the art of war. After one good night's sleep, a tribe becomes a civilization.
He aids the Yellow Emperor, fights Chiyou, tames the floods, and establishes the Nine Provinces. For six thousand years of upheaval, he is the “god” hidden in people's dreams.
Until the age of declining magic arrives and spiritual energy runs dry, he discovers a secret:
This world may be his own dream.
And when he wakes, he finds himself sprawled at a street stall, someone tapping him on the shoulder
“Boss, how much for the insoles?”