The first edict was that the gods were guilty, and they had to announce it to the world.
It was simple. Emperor Xin listed all the incidents of gods eating humans in Great Shang and let the people of Great Shang make their own judgments.
"In the first year of Emperor Xin, the Mountain God of the Green Lotus Mountain in the North Sea failed his duty. In the same year, the Mountain God of West Qi's Five Transformations Mountain kidnapped 1,000 women. Ten years later, a mass grave with 1,000 corpses was discovered!
"In the 2nd year of Emperor Xin, the River God of Wei River held a birthday banquet. Hundreds of miles of land around were turned into a swamp, and countless people were killed or injured!
"In the 3rd year of Emperor Xin, the River God of Qi River married a woman and ate her! It ate countless people!"
…
Each and every one of them was based on reason and evidence, and there was no room for the gods to refute them.