The Door Back from the Void

"This is a log Captain Roger wrote himself," Rayleigh said, carefully opening the notebook. "It records the truth we discovered on Laugh Tale."

Lin Ye held his breath as he studied the book that carried so much history. Roger's handwriting was strong and clear, unfaded even after all these years.

"Most people think the Void is some evil force invading our world, but the truth is far more complicated." Rayleigh pointed to a detailed drawing of two overlapping spheres. "The Void is another dimension that exists parallel to our reality, with its own rules and forms of life."

Lin Ye stared at the diagram in surprise. "You mean it isn't trying to destroy us, but..."

"Yes." Rayleigh nodded. "According to ancient records, our universe goes through a recurring phenomenon. Every few thousand years, the two dimensions enter an 'Overlap Period,' and the boundary between them blurs. In itself, it's as natural as the rise and fall of the tides."

He turned to the next page, which showed a Star Chart formed by seven keys. "During the last Overlap Period, the Ancient Civilization discovered these seven keys. Each represents a particular element or concept. Together, they can create an energy field that strengthens the Dimensional Barrier, preventing the two worlds from merging completely and destroying each other."

"But if it's a natural phenomenon, why are the Void's forces acting so aggressively now?" Lin Ye asked.

Rayleigh's expression darkened. "Because this time is different. Some entity is trying to accelerate and distort the process, tearing open the Dimensional Barrier by force instead of letting the natural Overlap Period run its course. That's why the Void forces we've seen are so chaotic and dangerous. They're being forced into our world in an unnatural way."

Lin Ye considered this, then a thought struck him.