Lu Yin felt completely helpless. No sourcebox array was easy to deal with. To record down these sourceboxes’ danger fields, he would first have to disassemble the sourcebox array and then record down each sourcebox separately while dealing with all three sourceboxes’ danger fields at the same time. Lu Yin’s current level might be enough to let him succeed, but it would take a long time, and time was not something that he had.

Right when he was about to leave, he glanced to the side and saw a man approaching a little ways behind him. The man looked quite old and had a solemn expression on his face. He stopped at a similar distance away from the sourcebox array as Lu Yin and simply stared at three Perceptive Intermediate sourceboxes.

"Might I ask who Senior is?" Lu Yin asked.

The man looked over at Lu Yin. "Xu Feng."

Lu Yin had never heard of this person. "This junior is Lu Yin."

"I know. I’ve been keeping track of your progress," Xu Feng replied. He then returned his attention to the three Perceptive Intermediate sourceboxes. "Even if it is complicated, it’s not that rare for sourceboxes to naturally form an array, though they do take a bit of time to study.”

"Then this junior won't disturb Senior," Lu Yin said before moving to leave.

Xu Feng stopped him. "Wait."

Lu Yin looked back.

"Are you recording sourceboxes?"

"Yes."

"How many have you recorded so far?"

"Seventy-six...