Five Stone Powder, also known as Cold Food Powder, was widely circulated during the Weijin Period. In fact, it is an ancient type of narcotic; after consumption, it's very addictive, causing people to feel an intense heat, which is why many Weijin scholars wore loose clothing—it was due to the medicinal effects of the Five Stone Powder causing body heat.
Not only that, but Five Stone Powder also has aphrodisiac properties, enhancing energy. After consumption, it makes one feel euphoric and the skin highly sensitive, requiring cold food, warm wine, disrobing, and exercise to sweat to disperse its effects. In essence, Five Stone Powder acts as an aphrodisiac.
This is why Princess Fu'an said it would bring Tang Feng more joy and prowess; initially, she secretly drugged him for their nightly pleasures.
Poor Tang Feng thought he was madly in love with this woman and believed that his craziness was only a normal male physiological reaction due to the intense heat.
