The original novel had Joanna die to Leo's toxic mist during her very first appearance.
Her sole value to the plot was to enrage Adrian, causing him to seek revenge. Which ultimately led to him being killed by Knox as well.
Alex felt a deep sense of injustice regarding this.
That was why he specifically called her out to bring her to the Five Poisons Valley. On this trip, Alex wasn't just going to crush Knox's hopes of finding a helper. He was going to snatch Knox's fortuitous encounter and give it entirely to Joanna.
…
The Five Poisons Valley was located on the northern border of the Heavenly Flame Dynasty.
Spanning an area of eight hundred miles, the entire region was covered in miasma and toxic gas. The living creatures that survived here were almost exclusively venomous beasts harboring lethal toxins.
