While Azaroth was on his way to the battlefield between the Black Lake Sect and the Night Mountain Sect, he narrated the recipe for the poison to Bianca.
Bianca quickly wrote down all the instructions and made notes.
She decided that it was time to act against Liam Parker and kidnap him. The plan to kidnap Liam Parker was rather simple.
She planned to have her personal maid kidnap this man from his house. Liam's house had quite a bit of security, but Bianca was confident that her subordinate could take care of them all and kidnap Liam without revealing her true identity.
This was actually the most important part of this mission. If she revealed her true identity, and it was leaked somehow, then Bianca would begin to be suspected as well.
Azaroth would lose another piece within the Sinyalian Kingdom. With just Josephine, it would be quite difficult to manipulate the events within the Sinyalian Kingdom.