The temperature dropped the moment I crossed the threshold.

  Outside, the Emberfall evening had been pleasantly cool. Inside the cave, the air carried a chill that had nothing to do with weather. Concentrated spiritual energy pooled in this space like cold water settling at the bottom of a well. I could feel it against my skin, dense and waiting.

  My breath misted in front of my face as I moved deeper. The fading daylight from the entrance provided enough illumination to navigate the first stretch. Cave walls rose smooth on either side, worn down by centuries of water flow before the river changed course and left this passage dry. Mineral deposits streaked the stone in pale green patterns that caught what little light reached this far.

  I'd gone maybe twenty paces when I noticed the glow.

  My pouch was emitting light. Faint at first, barely visible against the darkness ahead. But it grew stronger with each step I took. I stopped and pulled out the two spirit stones.

  They were glowing. Both of them pulsed with soft blue luminescence that lit up my hands and cast wavering shadows across the cave walls. The light wasn't static. It seemed to breathe, brightening and dimming in a rhythm I couldn't identify. Responding to something in the environment. Resonating with the concentrated spiritual energy that filled this space.

  Definitely a Qi Reservoir.

  I held the stones higher and used their glow as a light source. The blue illumination revealed more of the cave's interior. The passage continued deeper, sloping gradually downward into darkness. More mineral deposits covered every surface, and I could see now that they weren't random patterns. They formed interconnected lines and shapes across the stone. Channels carved by water over centuries, or maybe by something else entirely.

  The thought occurred to me that qi might flow through stone the same way water did. Given enough time, spiritual energy could carve its own pathways through rock. If that was true, these mineral channels might function like meridians for the cave itself. A natural Array formation created by geological processes aligning with spiritual ones over thousands of years.

  Scholar Wu's hallucination warnings made more sense now. If this cave contained an active Array, anyone who entered would be exposed to whatever effects it produced. The deeper you went, the stronger the formation, the more intense the effects.

  I continued walking. The spirit stones' glow intensified with each step, blue light growing brighter until it was almost uncomfortable to look at directly. I tucked them back into my pouch, but the light shone through the fabric and turned the whole thing into a makeshift lantern hanging at my hip.

  The air grew thicker. Not physically, but spiritually. Each breath felt like inhaling something more substantial than air. Pure energy entering my lungs with every inhale. I could feel my body responding in ways I hadn't expected.

  My skin tingled. The sensation started subtle, like the prickle of static electricity, then intensified and focused on specific points across my body. My pores were opening. I'd read about this in Elder Huang's book. When exposed to sufficiently concentrated spiritual energy, a cultivator's body would begin automatic processes to facilitate qi absorption. Pores opening to allow energy flow. Meridians expanding to handle increased circulation. The dantian preparing to store refined qi.

  Body Tempering cultivation was about refining the physical vessel to handle spiritual energy. Being in a Qi Reservoir this potent apparently jumpstarted that process whether you were ready or not.

  The passage opened into a larger chamber.

  My spirit stones' light revealed a roughly circular space about thirty paces across. The ceiling rose high enough that the blue glow couldn't quite reach it, leaving the upper portion of the chamber in shadow. Mineral deposits covered every visible surface of the walls, and here the patterns were unmistakable. Elaborate interconnected designs that spiraled inward toward the center of the chamber. Definitely an Array formation.

  The spiritual energy was almost overwhelming. I could feel it pressing against me from all directions, trying to force its way into my body through my opened pores. My breathing had grown heavier without me noticing. Each inhale brought more qi into my lungs than I'd ever experienced in normal cultivation practice.

  This is the perfect spot.

  I moved toward the center of the chamber. The plan was simple. Sit down, begin proper meditation, use the spirit stones to supplement the ambient energy, and attempt breakthrough to Stage Two. Everything I'd read suggested the process would take several hours of focused cultivation.

  But with each step toward the center, the pressure increased. The spirit stones in my pouch blazed brighter. Their blue light grew so intense it hurt to look at even through the fabric. The Array patterns on the walls seemed to pulse in response, the mineral channels glowing faintly with their own pale green luminescence.

  Then the pain started.

  It began in my chest. A sharp ache that had nothing to do with my healing injuries. This was deeper. Internal. Something happening to my organs that I couldn't see or control. The ache spread outward through my torso, radiating along pathways I recognized as my meridian channels.

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  I stumbled and went down on one knee. Stone scraped against my leg through my robes. The pain intensified. No longer just my chest but spreading through my entire body. My meridians burned as qi rushed through channels that weren't prepared for this volume of energy. My dantian felt like it was being compressed by forces I couldn't resist.

  Toxin expulsion.

  I'd read about this too. Body Tempering wasn't just about strengthening the physical form. It was about purifying it. Removing accumulated mundane toxins that prevented efficient qi circulation. Most cultivators experienced gradual toxin expulsion over months or years of careful practice. Small amounts pushed out through sweat and breath during regular cultivation sessions.

  This Qi Reservoir was forcing the process to happen all at once.

  Black sweat began pouring from my skin. Thick and foul-smelling, darker than any normal perspiration. The impurities in my body being expelled through my opened pores, pushed out by the overwhelming spiritual energy flooding in to replace them. I could see the dark liquid beading on my hands, running down my forearms, dripping onto the stone floor.

  My vision blurred. The chamber seemed to tilt and spin around me. The blue light from my spirit stones and the green glow from the Array patterns mixed together into dizzy swirling colors that made my stomach lurch.

  I tried to stand. Failed. Tried to crawl back toward the passage entrance where the spiritual energy had been less concentrated. My hands and knees scraped against stone as I dragged myself forward. Each movement sent fresh waves of agony through my body. Every muscle screamed. Every bone ached down to the marrow. My meridians felt like they were being scoured clean by qi that moved too fast and hit too hard.

  Too much. Too fast.

  I'd miscalculated badly. The inner sect disciples Scholar Wu mentioned had been at higher cultivation stages when they used this cave. Their bodies were already tempered, already purified, already capable of handling concentrated spiritual energy. They could withstand the pressure because they'd built up to it gradually over years of training.

  I was at Stage One. Barely started on the path. My body still contained all the accumulated toxins of a lifetime, and this Qi Reservoir was trying to purge them in minutes rather than months.

  The black sweat kept pouring. I could smell it now, acrid and wrong, like something rotting being pushed out through my skin. My robes were soaked through. The stone beneath me was slick with expelled impurities.

  My arms gave out and I collapsed fully onto the floor. My cheek pressed against cold rock. The mineral patterns carved into the stone pulsed with pale green light directly in front of my eyes. Or maybe that was just the hallucinations starting. Hard to tell the difference when your entire body was being forcibly purified.

  The pain reached a peak that whited out my vision entirely. For a moment there was nothing but agony, pure and absolute, filling every part of my awareness. My consciousness tried to flee from it, tried to retreat into some protected corner of my mind where the sensation couldn't reach.

  Then something shifted.

  The pain didn't stop, but it changed. The sharp burning sensation in my meridians began to ease, replaced by something that felt more like stretching than tearing. The pressure on my dantian lessened slightly. My breathing came easier, each inhale bringing energy that no longer felt like it was trying to destroy me.

  The toxins are clearing.

  I couldn't move yet. Could barely think through the residual pain. But I was aware enough to understand what was happening. The forced purification was completing. My body had expelled enough impurities that it could finally start processing the spiritual energy properly instead of just being overwhelmed by it.

  The black sweat slowed to a trickle. My pores were still open, still absorbing qi from the Reservoir around me, but now my meridians could handle the flow. The energy circulated through my channels with something approaching smoothness rather than the chaotic flooding of before.

  I lay on the stone floor and breathed. In and out. Each breath bringing spiritual energy into my lungs. Each exhale releasing the last traces of expelled toxins. The blue light from my spirit stones had dimmed to a gentle glow. The Array patterns on the walls pulsed slowly, rhythmically, like a heartbeat.

  I survived.

  The realization brought a wave of relief so strong it almost made me laugh. I'd made a stupid mistake coming here unprepared. Should have used the sect cultivation chambers. Should have asked for supervision. Should have researched more carefully before assuming I could handle anything this world threw at me.

  But I'd survived it. Barely. Through luck more than skill.

  My body felt different. Lighter somehow, despite the exhaustion weighing down every limb. Cleaner. Like something fundamental had changed in how I was put together. The toxin expulsion had done its work whether I'd wanted it to or not.

  I tried to move my fingers. They responded sluggishly but they responded. Tried to lift my head. The chamber swam around me for a moment before settling. My vision was coming back, the blurriness fading.

  The spirit stones still glowed softly in my pouch. I still had them. Still had the resources for a proper breakthrough attempt once I recovered enough to actually meditate.

  If I recover.

  That thought sobered me. I was lying in a pool of my own expelled toxins, barely conscious, in a cave three li from the sect with no one knowing where I'd gone. If something went wrong now, if my body couldn't handle the aftermath of forced purification, no one would find me until it was too late.

  I needed to move. Needed to at least get back to the passage entrance where the spiritual energy was less intense. Somewhere I could rest and recover without the constant pressure of the Qi Reservoir pushing more energy into my depleted body.

  I planted my palms against the stone and pushed. My arms trembled violently but they held. I got my knees under me. Then one foot. Then the other.

  Standing took everything I had. The chamber tilted dangerously and I nearly went down again. But I locked my knees and waited for the dizziness to pass.

  The passage entrance was maybe thirty paces away. I could see it from here, a darker shadow against the glowing Array patterns. Thirty paces. That was all. I'd walked further than that while bleeding from wolf claws.

  I took a step. Then another. My legs felt like they belonged to someone else, responding to commands with a delay that made each movement uncertain. But they moved.

  The spiritual energy lessened with each step away from the chamber's center. By the time I reached the passage, I could breathe without feeling like I was drowning in qi. The pressure on my skin eased. My meridians stopped burning.

  I made it maybe ten paces into the passage before my legs gave out completely. I slid down the wall and sat with my back against cool stone, too exhausted to go any further.

  The blue glow from my spirit stones provided enough light to see by. The darkness of the passage stretched ahead of me toward the distant entrance. Behind me, the chamber still pulsed with concentrated spiritual energy.

  I closed my eyes and everything went dark.