After carefully analyzing Chen Fuhan's infected blood, Ye Jiuge found that, in addition to Red-crowned Crane, it contained a poison called Icy Vigor Powder.
Strictly speaking, Icy Vigor Powder was an aphrodisiac, not a poison. Upon consumption, it allowed a person to feel as though he or she were in paradise and live as if in a dream. It made a man more powerful in bed and increased a woman's pleasure.
This aphrodisiac also had another use that was often neglected: It could be used to suppress different toxins. However, sexual intercourse caused suppressed poison to break out with amplified effects.
Su Yufeng had used the Icy Vigor Powder on Chen Fuhan to humiliate Fifth Concubine before she brought over her servants to catch them in the act. Chen Fuhan would have died from the poison in bed, and Fifth Concubine would have never been able to cure herself even if she had jumped into the Yellow River.
