They stood at the boundary on day forty-seven.

  The ward was invisible in the conventional sense — no wall, no gate, no physical marker.

  But to cultivator senses, it burned.

  A flat plane of energy stretching across the landscape, anchored to nodes buried deep underground, powered by something Chen Xi estimated had been generating consistent output for at least five hundred years.

  The engineering was impressive. The mathematics, now that he could read it, was not.

  "The ward operates on a pulse-detection system," he told Wu Zheng, who was standing very still and looking at the shimmer with the expression of a man who had excellent reasons to be terrified of it.

  "Every 2.3 seconds, it performs a sweep. The sweep measures ambient Qi density within a three-metre radius of the boundary.

  If the density exceeds mortal baseline — which is effectively zero in the Silt — it triggers.

  The trigger activates a disruption field that attacks the source of the excess Qi. In a cultivator, that means your dantian. In someone with a damaged dantian, it means whatever's left."

  "And in you?"

  "In me, it means the vortex. Which is why I need to collapse the vortex entirely, cross the boundary during a sweep interval, and re-establish it on the other side.

  I'll have 2.3 seconds of zero cultivation. If the ward sweeps during that window and detects nothing, we're through."

  "We."

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  "Your energy signature has been restructured. You'll read as mortal for approximately six minutes — long enough to cross, not long enough to loiter.

  Once we're through, the modification will decay and your natural circulation will reassert itself."

  Wu Zheng looked at his hands. He had felt the restructuring when Chen Xi performed it — a strange, disorienting sensation, like hearing a familiar song played in the wrong key.

  His Qi was still flowing, but the flow had been... twisted. Redirected into a pattern that felt fundamentally wrong, like walking on the wrong foot.

  "Six minutes," he said.

  "Five minutes and forty-eight seconds, to be precise. We should go."

  Chen Xi collapsed the vortex.

  The silence that followed was absolute — not the absence of sound but the absence of something deeper, the constant hum of processed energy that had become as natural as breathing over the past six weeks.

  Without it, he felt hollow. Diminished. Like a house with the electricity cut.

  He stepped forward.

  One step, two, three — into the shimmer. The ward pulsed.

  He felt it wash over him: a probing wave of energy that touched his body, his meridians, the shattered dantian, and found nothing.

  No stored energy. No active cultivation. A mortal. The wave passed.

  He was through.

  Wu Zheng followed. The old man walked with the rigid, controlled steps of someone crossing a frozen lake, each footfall measured, his breathing shallow.

  The ward pulsed. It touched him.

  The restructured energy signature held — barely, a margin so thin that Chen Xi, watching from the other side with every analytical faculty he possessed, noted a fluctuation of 0.07% above mortal baseline that the ward's detection threshold, mercifully, did not catch.

  Wu Zheng crossed. He stood on the other side, on soil that was not composed of the dead, and his legs gave out.

  He sat in the dirt and breathed in air that was clean and warm and free of the copper smell he had been inhaling for twenty-six thousand, six hundred and forty-five days, and he put his face in his hands and did not speak for a while.

  Chen Xi sat beside him and re-established the vortex.

  The hum returned. The world sharpened. He waited.

  "I thought I would die in there," Wu Zheng said, eventually. His voice was steady, which seemed to cost him considerable effort.

  "I had made my peace with it. I had named the corpses and chosen my favourite and decided where I wanted to be buried, which was next to Lao Meng, because he was the best listener."

  He lowered his hands. His eyes were dry but his face had the stripped, raw look of someone who had been crying on the inside.

  "Thank you."

  "You're welcome," Chen Xi said.

  "The residual energy data from the Silted Bones was invaluable. I would not have developed the vortex core without it.

  Our arrangement has been mutually beneficial."

  Wu Zheng looked at him. Then he laughed again — the second time in seventy-three years.

  "You are," he said, "the worst person I have ever liked."