Longevity Powder, a term Qing Yu had just thought of, but its predecessor, "Five Stone Powder," was famously known in Qing Yu's previous life.
Five Stone Powder, also known as Cold Food Powder, was a medicine developed by Zhang Zhongjing, a famous doctor during the Eastern Han Dynasty, to treat typhoid fever. Later, it was modified by Cao Cao's adopted son, He Yan, completing the transformation from medicine to poison, arguably the earliest form of poison. During the Wei and Jin Dynasties, many of the elite ingested Five Stone Powder, among whom the most well-known was the "Calligraphy Saint," Wang Xizhi.
On the basis of the Five Stone Powder modified by He Yan, Qing Yu added several hallucinogenic drugs. Those who consumed Longevity Powder would feel full of spirit, as if on the verge of heaven, casting all troubles away from their minds.
