“Those things are sourceboxes that an almighty Lockbreaker arranged to spread an invisible field of danger around the fort. They’ve allowed Seasons Fort to resist the astral beasts’ invasions many times.” A veteran sighed as he walked over next to Lu Yin. After explaining what Lu Yin was seeing in the sky, the soldier bent down and continued to clean up the battlefield. 

Tidying up the battlefield was this man’s job.

Lu Yin was amazed. “Formless danger from sourceboxes? What kind of Lockbreaker did that?”

The veteran shook his head. “Don’t know. It was too long ago.”

“Then why wasn’t it used in the last battle?” Lu Yin asked.

The veteran grudgingly explained, “There’re loopholes in every defensive system, and after so many years, the astral beasts have found gaps in the field of invisible danger zones formed by each sourcebox. They might have been put up there as a form of added protection, but they’re essentially useless. Actually, they’re more important in a symbolical sense than any practical one. Well, unless of course someone can patch up the holes that have formed.” 

Lu Yin thoughtfully looked up towards space. Patch it up? He wanted to try such a thing.

He recalled that the Trialmaster had once said that a Lockbreaker had to at least be a Boundless Advanced Lockbreaker to be able to arrange sourceboxes into an array that possessed any measure of danger. This was something that...