Introduction to the Alchemy Furnace: Legend has it that when Taishang Laojun came to the world, he saw that people were sick but could not fight against the disease. In order to treat people without violating the laws of nature, Taishang Laojun asked his disciples to Yulu Tongzi secretly moved the alchemy furnace to Yulian Cave in Yunqiu Mountain, and used the rich resources here to make alchemy and save people. One day, the Jade Emperor summoned the Supreme Master back. Before leaving, the Supreme Master asked the Jade Deer Boy to take good care of the elixirs he was making. In order to be optimistic about the elixir, Jade Deer Boy turned himself and the alchemy furnace into stone.