Here it comes (1)

However, there was a problem. If one wanted to use this kind of curse technique that was more advanced and less easily discovered, one would first have to get these dust-like bugs. Without these bugs, one would not be able to use this curse technique. Whether it was the five spirit world or the curse technique world that Zhao Hai had seen before, the research in this area was very backward. They had no way of getting these bugs. Naturally, there was no way to use this kind of high-level curse. Therefore, many of these curses were only at the theoretical stage and had not been put into practice.

However, this problem was not a problem for Zhao Hai. Bacteria, viruses, and all kinds of microorganisms were small life forms that had been discovered by scientists on earth. They were the perfect medium to use.