Due to his augury and reverse-engineering methods, Bai Xiaochun was very confident regarding the formula for fifteen-colored flame. However, it was still a very difficult thing that would require a lot of work.
Thankfully, he had plenty of vengeful souls to work with. He made one attempt after another, and failed at every one, but at the same time, learned from every one. After identifying the reasons for failure and then resolving them, he made constant progress. Time passed, and he became more and more proficient in flame conjuring.
"Ten more times! That's all I need to succeed!" Even as he pulled out more vengeful souls to work with, the blooming of the Ghost King Orchid was causing a huge stir in Arch-Emperor City.