Skymender answered, "Humanoid sourceboxes are extremely difficult to unlock, as they are not true sourceboxes. Rather, they are people who have transformed themselves into sourceboxes with the Stone Origin technique, which means that they cannot be unlocked in a traditional manner. Instead, they need to be unlocked by inverting the technique with the necessary sourcebox array. Unfortunately, it is far from easy to invert the necessary sourcebox array, as everything needs to be adjusted according to the exact time of day, location, blood of the transformed human, and many more minute details. Over the years, I obtained two opportunities to use the sourcebox array, but I was delayed due to various reasons."

Skymender's explanation sounded quite reasonable, but Lu Yin still pulled out a wireless jincan. Then, he sent Lu Buzheng a message in front of Skymender, asking if the man had ever heard of the Stone Origin technique. He soon received confirmation, as well as a description of the technique that very closely resembled what Lu Yin had already heard from Skymender. However, Lu Buzheng also reported that the inverted sourcebox array had long since gone missing.

"Only a few Progenitors even knew about the existence of the inverted sourcebox array, and that was because a Progenitor created the Stone Origin technique. He was naturally killed by other Progenitors. I happened to learn it by chance, but people only know...