"Biography of the Immortals·Guankou Erlang" records that there are three original problems in Chengdu, namely drought, floods and the ancient evil black dragon. "(Li Bing) The second son Erlang led several brothers to subdue the evil dragon and put it under Li Dui. He also carved a bronze figure to make the evil dragon roll up rocks and sand according to the degree, so that there was no risk of blockage of the water diversion mouth. Later, he helped his father to open the Tiger Rock, determine the water level, and set the water level. In Zhenghe Road, medicine was also introduced to ward off the evil caused by poisonous dragons... After a month, Erlang said to Bing: "I am grateful for your kindness and help you. Now that your magical power has been revealed, it is no longer convenient for you to live in the world." After saying this, he and his brothers left in the clouds. The people of Shu worshiped him in statues, but they didn't know his name, so they called him "Guankou Erlang (god)".
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