After returning to the palace, Emperor Jianwu pondered how to cause the Empress Dowager to miscarry.
He didn't understand the matters of women becoming pregnant and giving birth. When he asked Mr. Liu, Mr. Liu knew even less.
Emperor Jianwu was also afraid that the Imperial Physicians in the palace were the Empress Dowager's people, and thus he dared not ask them.
Eventually, having no other recourse, he let Yun Que help gather some information.
After all, Yun Que had extensive connections and knew all sorts of people; she was certainly able to find something out.
And indeed, Yun Que knew.
After all, she had stayed in a brothel before, where there were plenty of secret medicines, including many that could cause sterility.
A few days later, Yun Que brought the medicine to Emperor Jianwu and told him how to use it.
With the medicine obtained, the difficult part was how to get the Empress Dowager to drink it.