Li Wei arrived in Clearwater Crossing on the sixty-first day.

  He came alone. The Dustfall Blade across his back. No sect insignia. Three weeks of Torrent wilderness on his face.

  The journey had tried to kill him.

  A spirit beast — a creature of living stone, three metres tall, with a body that resonated at a frequency Li Wei recognised from Chen Xi's tournament demonstrations — had attacked him on the seventh day.

  He had fought it for forty minutes.

  Traditional sword techniques did nothing. The stone reformed. The beast absorbed kinetic energy. Every strike made it stronger.

  On the forty-first minute, Li Wei stopped fighting like a swordsman and started thinking like a physicist.

  He found the resonance frequency.

  Not through calculation — he didn't have the mathematics. Through intuition, refined by weeks of replaying Chen Xi's tournament fights in his memory. The frequency that made stone sing itself apart.

  He struck the beast at 4.3 hertz. A single, precisely calibrated blow.

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  The creature detonated from the inside out.

  Li Wei stood in the crater of a monster he'd killed with a borrowed idea and felt something he had never felt in his entire cultivation career.

  Gratitude. For a man he'd spent weeks hating.

  He found them at the Falling Leaf by asking locals where to find the physicist who'd destabilised the Technique Exchange.

  Chen Xi was at a corner table. Their eyes met.

  "You look terrible," Li Wei said.

  "I formed a quantum superposition cultivation core. You?"

  "I walked through the Torrent for three weeks and killed a spirit beast with resonance physics."

  "You used resonance?"

  "I used what you taught me. Without your permission. And without understanding the mathematics."

  "Did it work?"

  "I'm here."

  Li Wei sat. Two metres away. The Probability Core held.

  "Your method isn't stealing from me," Li Wei said.

  "I fixed it. Probabilistic intake filter."

  "How accurate?"

  "Ninety-four percent."

  "And the other six?"

  "I'm learning to live with uncertainty."

  Li Wei studied him. Saw something in Chen Xi's face that hadn't been there in Jianzhou.

  Something broken. Something rebuilt.

  "I'm staying," Li Wei said. "Not as your student. Not as your rival. As someone who knows things you need to understand."

  "Such as?"

  "The sects. The politics. The power structures your equations can't model.

  You're brilliant, Chen Xi. You're also a foreigner who treats social systems as physics problems, and someone more politically sophisticated will eat you alive."

  "That's a long speech."

  "Three-week walk. Had time to rehearse."

  Chen Xi almost smiled. The expression felt unfamiliar.

  Something was building in Clearwater Crossing — a tension he could measure in the city's energy patterns but couldn't yet name.

  Li Wei's arrival felt less like coincidence and more like preparation.

  For what, he didn't know.

  But the data was accumulating.