The Sealed Domain was visible from fifty miles out.
A dome. Not like a barrier dome — those were translucent, fragile, temporary. This was a wall. Solid white-blue, opaque, stretching from horizon to horizon, rising so high that its upper surface disappeared into the overcast arctic sky. It looked less like a containment field and more like a piece of the sky had been folded down and pressed against the earth.
The Divine Legion's transport fleet approached from the south, a column of military aircraft flying in formation. Two hundred and twelve personnel. Seven squads. Commander Yara in the lead aircraft.
Voss sat in the rear of transport six with Squad 7. The dark armor hummed beneath his skin. The echo was awake — had been since they'd entered the arctic airspace, its presence growing stronger as they approached the Domain.
"I built this," the echo said. "Or helped build it. The Attuned of my time — three thousand of us — wove this barrier from our combined mana. It took seventeen days. By the end, two hundred were dead from mana exhaustion."
"It's holding."
"It's degrading. Can you see it?"
Voss activated Thread Sight and looked at the Domain wall through the transport window. At maximum range, he could see the barrier's thread structure — and it was extraordinary. Not the simple lattice of a standard barrier dome. This was a tapestry. Millions of threads, woven in patterns so complex they approached fractal geometry, each one anchored to a specific function: containment, dampening, isolation, starvation.
But the tapestry had holes. Threadbare patches where the weave had thinned. Gaps where entire sections had degraded beyond structural function. Repairs — cruder, less sophisticated than the original design — had been layered over the weak points like bandages over wounds. The repairs looked recent. Centuries recent, not decades.
"The trial teams made those repairs," the echo said. "They saw the degradation and tried to fix it. But they didn't understand the original architecture. Their repairs sealed the surface holes while leaving the deep structure compromised."
"Like patching a leaking pipe without fixing the crack."
"Exactly. The surface holds. The foundation crumbles."
The transport descended. Landing pads had been established on a plateau two miles from the Domain wall — a temporary military installation that went up every year for the trial and came down after. Barracks, medical facilities, communications equipment, supply depots. The infrastructure of a military operation that the institution treated with the gravity of a religious pilgrimage.
The air outside was arctic cold. Voss's enhanced physiology handled it — the defense threads and the dark armor's passive protection made the sub-zero temperature uncomfortable rather than dangerous. Dex emerged from the transport in a thermal field jacket that made his already substantial frame look like a walking wardrobe.
"Hate the cold," Dex muttered. "Hate the cold, hate the cold."
"Volume down, berserker," Ryn said. But the corner of her mouth twitched.
---
The pre-trial briefing was held in the operations tent at sixteen-hundred hours. Commander Yara addressed the full Divine Legion from a raised platform, the Domain wall visible through the tent's transparent rear panel.
"The annual Sealed Domain trial commences tomorrow at oh-six-hundred," Yara said. "Twelve days of operations inside the Domain. Seven squads deployed in two phases."
She outlined the plan. Phase one: three squads enter through the main gate and establish a forward operating base at the first defensible position inside the Domain. Phase two: the remaining four squads advance deeper, engaging the Domain's demon population in systematic clearance operations.
"Our objective is twofold," Yara continued. "Primary: standard trial operations — demon clearance, resource extraction, operational training. Secondary: intelligence collection. Squad 7 has been assigned a special intelligence mandate."
She didn't look at Voss. She didn't need to. Everyone in the tent knew who the intelligence mandate belonged to.
After the general briefing, Yara held Squad 7 for a private session. The operations tent emptied. The transparent panel showed the Domain wall in the arctic twilight.
"The public objective is clearance. Your real objective is investigation." Yara pulled up a tactical display. The Domain's internal geography — what was known of it — appeared as a three-dimensional map. "I need three things from the Domain's interior."
She held up one finger. "Verification of the feeding mechanism. Memory threads from the Domain's oldest demons, confirming or denying that the annual trials have been strengthening the Sovereign."
Second finger. "Assessment of the Sovereign's current strength. The classified briefing says twice the original level. The echo says ten times. I need ground truth."
Third finger. "The intelligence leak. The Demon King in the capital had detailed information about our personnel. If the Sovereign's human assets extend to the Pillar level, the Domain trial is the one environment where those assets might be exposed — the Pillars coordinate directly during trial operations, and any anomalous behavior in their orders will be amplified by the Domain's isolation."
"You suspect a Pillar," Ryn said.
"I suspect someone with Pillar-level access. That's not the same thing. It could be a staff officer, an aide, a communications specialist. But the leak has consistently shown access to information that only the Pillars and their direct staff handle."
"Which Pillars are present for the trial?"
"All four. Rehav, Korvane, Lara Vex, Thane Orr. They coordinate the trial from outside the Domain, managing troop movements and extraction via the gate."
Voss felt the echo react. A pulse of attention. Interest. Something specific about one of those names had triggered a response.
"Rehav," the echo said. Quietly. Just the name.
Voss didn't react outwardly. But the echo's attention was noted.
---
Oh-six-hundred. The gate.
The main gate of the Sealed Domain was a controlled breach point — a section of the barrier where the original seal had been modified to allow entry and exit. The modification was younger than the seal by six hundred years. It had been built by the same generation that had instituted the trials.
The gate was forty meters wide and thirty meters tall. A rectangle of controlled absence in the Domain wall — not a hole but a thinning, the barrier's threads pulled aside like curtains to create a passage. The threads were visible to Voss's enhanced Sight: a dense frame of woven mana, each strand anchored to the next, holding the opening stable against the immense pressure of the Domain's interior.
Beyond the gate: darkness. Not natural darkness — the absence of exterior light, replaced by the Domain's own illumination. A faint, sickly green-white glow from bioluminescent flora that had evolved in eight hundred years of isolation. The air through the gate was warm. Not arctic warm — tropical warm. The Domain had its own climate.
Phase one squads entered first. Forty-eight personnel, moving in formation through the gate and into the Domain's entry corridor. The corridor was ninety-two meters wide — the echo had been exactly right — and extended into the Domain for three hundred meters before opening into the first chamber.
Squad 7 entered with phase two. Voss stepped through the gate and felt the Domain close around him.
The mana density was staggering. Like stepping from thin mountain air into a deep-sea pressure chamber. His Thread Sight blazed — every surface, every wall, every patch of bioluminescent moss was saturated with thread-visible energy. The ambient mana was so dense that threads were visible in the air itself, floating like dust motes in sunlight.
"Mana regeneration drop," Ryn reported. "Fifty percent. Confirmed."
Everyone felt it. The Domain's environment actively suppressed human mana recovery. Whatever energy they spent inside would take twice as long to recover. In a sustained engagement, that was the difference between survival and exhaustion.
The entry corridor was ancient. The walls were not natural rock but something grown — organic, ribbed, pulsing faintly with mana in a rhythm that Voss recognized from the memory threads.
A heartbeat. The Domain itself had a pulse.
"The Abyssal Core," the echo said. "You can feel it. The heartbeat is the Core's respiration — it pulses mana outward through the Domain's structure, maintaining the ecosystem, sustaining the demons, feeding the corruption."
"How far to the Core?"
"From the gate? Several hundred miles. The Domain is large and growing. The Core is at the geographic center."
Squad 7 moved through the entry corridor in combat formation. Dex on point. Kael ranging ahead. Tam anchoring. Lena and Ryn mid-line. Voss at the center, Thread Sight scanning the corridor walls, floor, and ceiling in a continuous sweep.
The first chamber was a cavern the size of a stadium. The ceiling was lost in darkness. The floor was uneven, covered in the same bioluminescent growth that lined the corridor. At the far end, three tunnel mouths opened like wounds — deeper passages, each one leading further into the Domain.
And in the cavern, waiting: demons.
Not the convergence-zone scouts or the barrier-grade monsters. Domain demons. Ancient, twisted, shaped by centuries of exposure to the Abyssal Core's radiation. Their bodies were wrong in ways that surface demons weren't — extra limbs, asymmetric growth, faces that merged human and animal features into something that bypassed uncanny and went straight to alien.
Thread Sight showed their structures. Dense. Complex. Layered with eight hundred years of accumulated power and memory.
The oldest ones had memory threads that glowed not gray but white. Pure white. Memories so old they'd crystallized in the organisms' neural tissue, preserved by the Domain's mana density like insects in amber.
Ancient memories. From before the echo's war. From before the Sovereign learned about Thread Sight. From before the lies began.
The truth was in those threads. All Voss had to do was reach the bodies.
"Contact," Kael reported. "Twelve hostiles. Three tunnel mouths. Defensive formation."
Ryn's voice was ice. "Engage."
Squad 7 moved into the Domain's first chamber like a blade into a body. Precise. Deliberate.
And the carving began.
