What is the short version of the legend of Double Ninth Festival?

Folklore: Climbing to find nine calamus: According to legend, the custom of climbing on the Double Ninth Festival began when Qin Shihuang ordered Zheng An, a warlock, to go to Lingnan to find the elixir of life. When Zheng An found Jiucalamus in Baiyun Mountain, he unfortunately fell off a cliff and was hoisted by a crane.

Climbing the mountain brings back the fire of thunder and lightning: the ancients thought that the mountains were shrouded in clouds and lived with dragons calling for thunder and lightning. Moreover, lightning in the mountains can bring kindling, and you can make a fire to eat cooked food with foul smell.

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The Double Ninth Festival is born out of the change of seasonal climate, but the determination of solar terms only provides the necessary premise for the festival. As a festival, the Double Ninth Festival originated in the Han Dynasty. By the Northern and Southern Dynasties, various customs and activities had basically taken shape.

In the Han Dynasty, the Double Ninth Festival has become a fixed festival, and there are some customs, such as wearing dogwood, drinking chrysanthemum wine and climbing mountains. The prosperity of Tang and Song Dynasties pushed the Double Ninth Festival to its peak. In the mid-Tang Dynasty, the supreme ruler officially designated it as the Double Ninth Festival, which became the legal "Three Orders Festival" (in the fifth year of Zhenyuan, Tang Dezong issued a decree, taking the first day of February as the Zhonghe Festival, the third day of March as the Shangsi Festival, and the ninth day of September as the Double Ninth Festival, collectively known as the "Three Orders Festival"). During these three festivals, civil and military officials have a day off.