A hundred cultivators flew north at dawn.
The formation was Mingxue's design: a diamond shape with the strongest fighters at the cardinal points, the Alliance warriors filling the interior, the formation masters and support personnel at the center. Rhen flew at the diamond's leading edge with Mingxue beside him, her Sovereign's Domain primed but not active, her armor catching the morning light. Fengli held the right point, Fengli's spatial-suggestion sword technique giving him an effective threat radius that extended well past his physical reach. Kangde held the left point with his Great Zhao warriors fanned behind him.
The rear point was Lingwei. She'd left the compound for the first time in months, her guqin case strapped across her back alongside a satchel of formation components. Rift Step gave her the ability to relocate anywhere in the formation instantly, making her both a rear guard and a rapid-response asset. Beside her, Yanmei flew barefoot, her Primordial Fire Dao Body radiating warmth that the cultivators in her slipstream could feel.
Liu Mei flew with the formation team. Liu Heng flew beside her. They'd spoken for the first time since her departure three months ago, a brief conversation in the compound courtyard that neither described to anyone else. Whatever passed between them was theirs.
The Arbiter joined the formation at the rendezvous point north of Three Rivers Pass. He appeared from the treeline alone, in his gray robes, his Saint Embryo Peak cultivation restored to its full presence. The diamond formation parted for him, and he took a position beside Rhen at the leading edge.
"The Sects know," he said, falling into formation flight.
"How much?"
"That a large Alliance force is moving north. Not the specific destination or purpose. Tiankui's intelligence network confirms that Taihua and Yuanyang are tracking the formation's movement but haven't deployed interceptors. They're watching."
"Will they attack?"
"Unknown. The Purification Corps' main force is still assembling after the advance team's destruction. But Taihua has independent assets outside the Corps structure. Saint Embryo elders who don't answer to the joint command."
"Like Hua Ying."
"There are others. Xiao Yuan, the Taihua Sect Master, has been consolidating his personal forces since the Void Declaration against your partner Lingwei. He considers the Alliance a personal insult."
Through the bond, Lingwei's reaction was measured. The political armor, the careful calculation. But underneath it, the specific tension of a woman who knew that the man who'd tried to force her into an incestuous marriage was still alive and still powerful and still angry.
They flew north. The landscape changed as they crossed from Great Yue's temperate farmland into the colder northern territories. Great Han's border passed beneath them without incident, the kingdom's meager patrol forces giving wide berth to a hundred-cultivator formation.
The contamination zone's boundary became visible at noon. A shimmer on the northern horizon, the dimensional distortion bending light in ways that made the distant mountains look like they were melting. The zone had expanded since Rhen's last crossing, the quarter-mile lurch from Yanmei's departure now a permanent addition to the zone's footprint.
Lingwei's formation monitoring arrays, portable versions of the compound's display, showed the seal's real-time status: fifty-eight percent deterioration. The Empress's gold pulse: flickering every seven minutes.
They landed on the plateau at mid-afternoon.
The site was a flat expanse of rock, a natural formation elevated above the surrounding badlands. Lingwei had identified it because the Celestial Altar's outermost formation layer surfaced here, the seal's infrastructure emerging from its pocket dimension just enough to interface with physical space. To a normal person, the plateau was unremarkable. To Lingwei's formation sense, it was the seal's doorstep.
"Set the perimeter," Mingxue ordered. Kangde's warriors spread in concentric rings around the plateau, establishing defensive positions at three distances: fifty yards, two hundred yards, and half a mile. Meilin's fighters took positions between the rings, their anti-suppression lattice active and calibrated.
Bowen established a field laboratory at the plateau's southern edge, unpacking his formation-enhanced construction tools and the precision components he'd manufactured at the compound. Yanmei began heating the rock surface with controlled fire qi, preparing the foundation for the mechanism's physical array.
Lingwei walked to the plateau's center. Knelt. Pressed her palms against the stone. Her Rift Step's spatial sense extended downward, through the rock, through the soil, through the dimensional boundary between the mortal world and the seal's exterior surface.
"I can feel the seal," she said. "The fourth ring gap is directly below us. The pressure vent alignment is correct. The mechanism can be built here."
"How long to construct?"
"The formation array requires thirty-six hours of continuous work. Liu Mei and Yanmei will assist. Liu Heng will handle the structural calibration. Bowen builds the physical components as we go."
"Thirty-six hours," Mingxue said. She looked north, toward the contamination zone's shimmer. "We hold for thirty-six hours and pray the Sects don't interrupt."
---
The construction began at sunset.
Lingwei inscribed the primary formation array directly into the plateau's rock surface, her Primordial Water qi carving channels in the stone with the precision of a laser etching glass. The array's design was the hybrid mechanism she'd spent months building: Liu Mei's Seven Stars structural blueprint overlaid with Primordial-era grammar, calibrated by Yanmei's Ember Sight, reinforced by the Arbiter's restricted archive data.
The array covered the entire plateau. Fifty yards in diameter, a mandala of concentric rings and radiating lines that mirrored the Celestial Altar seal's own architecture. Each ring corresponded to a seal layer. Each line corresponded to a formation pathway. At the center, a single point where the pressure vent would open through the fourth ring gap.
Yanmei worked beside Lingwei, her Ember Sight checking every inscription for calibration errors, her fire qi hardening the carved channels into permanent formation conduits. Liu Mei followed behind them both, applying the Seven Stars Array's operational protocols to each junction point, ensuring that the hybrid design's Primordial elements didn't conflict with the existing seal infrastructure.
Liu Heng managed the calibration from a mobile formation desk that Bowen had built. His encyclopedic memory cross-referenced every parameter against the division's operational database, catching errors that the formation masters' intuition missed and confirming calculations that their expertise produced.
Bowen manufactured components as requests came in, his Taiyi formation-enhanced tools producing crystalline nodes, metal conduits, and qi-circulation housings with the methodical speed of a man who'd been building things his whole life and had finally found something worth building.
The work was beautiful. Rhen watched from the array's edge as four formation traditions converged on a single design, each contributor's expertise filling gaps that the others couldn't. Lingwei's Primordial grammar, Liu Mei's structural knowledge, Yanmei's diagnostic precision, Liu Heng's operational memory, Bowen's manufacturing skill. Five people from five different backgrounds, united by the specific urgency of a seal that was failing and a woman who was dying inside it.
The Arbiter watched too. He stood at the plateau's northern edge, his Saint Embryo cultivation monitoring the contamination zone for Sovereign activity, his eight hundred years of seal knowledge running a continuous assessment of the mechanism's viability as it took shape.
He said nothing during the construction. His contribution was complete. The data was provided, the archive shared, the countermeasures mapped. What remained was the work of the formation masters and the choice of the Oath Forger.
---
The first twelve hours passed without interruption.
The second twelve hours brought the Sects.
Tiankui's intelligence warning arrived at the twenty-hour mark: a Taihua Saint Embryo elder, accompanied by six Heavenly Position cultivators, had been dispatched from the Taihua pocket dimension. Destination: the northern badlands. Arrival: within four hours.
Not the Purification Corps. A personal strike force, deployed by Xiao Yuan outside the joint command structure. The Sect Master had seen the Alliance's movement and decided to act independently.
"Four hours," Mingxue said. She stood at the strategy position Bowen had set up, the portable map showing the approaching enemy's trajectory. "The mechanism needs sixteen more hours to complete."
"We hold," Rhen said.
"Against a Saint Embryo elder? We barely survived Hua Ying at sixth level. A Saint Embryo is three tiers above that."
"We have the Arbiter."
Everyone looked at the old man standing at the plateau's northern edge. The Arbiter turned from the contamination zone. His deep-set eyes moved across the assembled force, the formation array, the mechanism taking shape on the stone.
"I'll handle the Saint Embryo," he said. Flat. Certain. The voice of a man who'd been fighting Sacred Sect elders for longer than their Sect had existed. "Keep the Heavenly Position cultivators off the formation team. The mechanism must be completed."
"You'll fight a Taihua Saint Embryo elder alone?"
"I've been preparing for exactly this for eight hundred years." His hands emerged from his sleeves. Formation tattoos covered his palms, the same design language as the dissipation formation that had saved Qinghe City. Countermeasures. Built over centuries. Designed for exactly this kind of enemy.
Mingxue looked at Rhen. Through the bond, the calculation was clear: they didn't have a choice. The mechanism had to be completed. The Arbiter was the only person present who could face a Saint Embryo opponent. Trust was a luxury they couldn't afford and couldn't avoid.
"Four hours," Mingxue said. "Fengli, Kangde, Meilin — reorganize the perimeter for combat. Leave the inner ring clear for the formation team. We fight at the two-hundred-yard line."
The compound mobilized. Soldiers who'd been resting took positions. Weapons that had been stowed were drawn. The quiet construction site became a fortified position in forty minutes, because Mingxue had planned for this possibility and her plans were always faster than the emergencies that triggered them.
The Yifan-Wuji pair took a position on the eastern flank, their opposing Dao Body signatures creating an interference field that would degrade Sect suppression techniques. Bowen loaded his crossbow. Suyin, connected through the bond from the compound four hundred miles away, began feeding foresight data on the approaching force's composition and tactical tendencies.
Lingwei didn't stop working. Neither did Yanmei or Liu Mei or Liu Heng. The formation array was sixteen hours from completion, and they would build while the world burned around them, because the alternative was an uncontrolled seal rupture and four million deaths.
The construction continued. The soldiers waited. The Arbiter stood at the plateau's edge, his gray robes stirring in the wind, his eight hundred years of preparation about to meet their purpose.
And from the northwest, six qi signatures and one massive, semi-divine presence approached through the afternoon sky, carrying the authority of the Sacred Sect that had dominated the cultivation world for ten thousand years.
The Taihua Golden Bell's resonance preceded its wielder, a low hum that traveled through the air like a vibration in the bones of the earth.
