The ruins changed character past the outer wall section.
The excavated areas gave way to something more intact — corridors that had survived whatever had collapsed the outer structures, stone work that was older and more deliberate than the foundation rubble outside. The torches they carried threw shadows that moved wrong here, catching on angles that didn't quite make geometric sense, the kind of architectural detail that suggested whoever had built this place understood things about space that current builders didn't.
The air was heavier. Not temperature. Not humidity. The specific weight of a place where mana had been accumulating and corrupting for a very long time without anyone to interrupt it — pressing against the skin like something that wanted to be noticed.
His Threshold Sight registered it immediately.
Everything in this section of the ruins was close to an ending. The corruption had been building toward a threshold and whatever waited on the other side of that threshold was significantly worse than four constructs in an outer courtyard. Six days, the system had said. He understood now what that meant.
He held up a fist.
Senna stopped behind him without being told.
Silence.
Then — from ahead, from somewhere beyond the corridor's bend — a sound that wasn't a sound so much as a vibration. Low. Structural. The kind of thing that bypassed the ears entirely and registered in the chest as pressure.
Something very large had moved.
He looked back at her. In the torchlight her expression was controlled — the specific stillness of someone who had already decided not to show what they were feeling.
"How fast can you move?" he said quietly.
"Fast enough." A pause. "What's ahead."
"Something larger than what was outside."
Her jaw set. The calculation moved behind her eyes — the same one he'd watched her run before, cost against necessity, the math always landing in the same place.
"I'm not leaving," she said.
He turned back toward the corridor.
"Stay to the walls. Don't engage directly." He kept his voice low. "If it focuses completely on you — run for the exit. Don't look back."
"And if it focuses on you?"
"Then it's not focused on you."
She didn't answer. He took it as acceptance.
They moved forward.
The corridor opened into the central chamber and Lysander stopped in the entrance and took one full second to understand what he was looking at.
The chamber was large — the ceiling high enough that the torchlight didn't reach it, the floor wide enough that the far wall was barely visible. Stone work more elaborate than anything in the outer sections. The architecture of something that had been built to matter.
And at the center of it — the construct.
It had been the building's central support pillar once. He could still see that in its base — the original column, ancient and deliberately crafted, the kind of structural element that held everything above it. But the corruption had been working on it for years. Decades possibly. It had pulled stone from the surrounding structure into itself the way a wound pulled in infection, accumulating mass in layers until what stood there now was less pillar and more something that had decided to be a different thing entirely.
Four meters tall. Width that filled a third of the chamber. The dark veining of corruption ran through it so densely it was almost more corruption than stone — and it pulsed. Slowly. Rhythmically. Like something breathing.
It turned toward them.
The sound it made was not a roar. It was structural — the deep groan of stone under compression, the crack of weight redistributing, something that came up through the floor into the soles of his feet before it reached his ears.
Lysander felt the scale of it settle into his assessment and made his decision in the half second before it moved.
The core is buried. I have to strip the outer mass first. That means staying in contact with something that can end me with a glancing hit.
Don't think about the odds. Think about the next two seconds.
He moved forward.
The first strike came faster than the size should have allowed.
A sweeping arm — stone that had accumulated into a limb the width of a tree trunk, moving with the corruption's acceleration behind it, covering the entire width of his approach in a single horizontal arc.
He activated Void Step.
The world compressed for half a heartbeat — the specific silent displacement of void movement, no sound, no flash, just the space between one position and another collapsing — and he emerged two meters to the right of where the arm passed through empty air.
The arm hit the wall.
The chamber shook. Dust fell from the ceiling. A section of the wall cracked from floor to ceiling in a single clean line.
That's what a glancing hit does to stone. Don't get hit.
He was already moving toward the construct's side. Kagekiri came free of its sheath — not a full draw technique, not yet, just clean deployment — and void energy bled into the blade as he closed distance. The black steel went darker than its usual light-absorbing quality, the edges taking on a consuming depth that made the air immediately around the blade look slightly wrong, like light was thinking about avoiding it.
He drove it into the construct's outer mass.
The void energy met the corruption and the corruption lost. A section of accumulated stone the size of his torso went dark and inert, the animation draining out of it, chunks of it falling away to the chamber floor with impacts that echoed.
Not enough. The core was still buried under meters of the stuff.
The construct turned toward him. Slow in the turn — the mass worked against it there — but he could already see the next strike forming, the arm pulling back, the weight redistributing.
He moved before it completed.
Kept moving. Circle the mass, drive Kagekiri in at a new angle, void energy stripping another section. The construct tracked him — slower than he was, faster than something that size had any right to be. Every few seconds it got a strike off and every few seconds he had to be somewhere else before it arrived.
It was working.
It was also unsustainable.
The fourth exchange was where it went wrong.
He read the strike correctly — saw the arm commit, chose his angle, moved to take the void energy strike at the construct's left side where the outer mass was thinnest. Clean execution. Exactly what he'd planned.
What he didn't account for was the second arm.
The construct had two.
The left arm drove at him from the angle he'd expected. He was already moving to avoid it, already extending Kagekiri toward the target point — and the right arm came from the opposite direction, lower, not a swing but a push, the construct putting its full mass behind a strike that wasn't trying to hit him precisely, just trying to hit him at all.
It clipped his left shoulder.
The word clipped was doing a lot of work.
The impact lifted him off the floor. He crossed two meters of air sideways and met the chamber wall with his left shoulder and the back of his head and the full momentum of being hit by something the weight of a structural pillar moving at acceleration.
The world went white.
Not unconscious. Just — white. For approximately one second everything was light and pressure and the very distant sensation of his body deciding whether it was going to keep functioning.
It decided yes.
He pushed off the wall before the construct could follow up. His left shoulder reported its condition immediately and at length — not broken, the joint had taken the impact and held, but the damage was significant and specific and it was going to matter more with every passing minute.
He landed in a crouch, Kagekiri still in his right hand, and took one breath to locate the construct and reassess.
It was turning toward him. Slower than before — two of the strikes he'd landed had stripped significant mass from its right side, throwing off the weight distribution. It was compensating but the compensation was creating a pattern.
Left side is thinner. Core is closer to the surface on the left. The weight imbalance makes the left arm slower to commit.
His shoulder was on fire.
Note it. File it. Move.
From the wall — Senna.
He caught her movement in his peripheral vision and processed it in the same half second he was tracking the construct's next motion. She'd left her position along the wall without being told, circling wide around the chamber's edge, her two short blades drawn. She wasn't moving toward the construct. She was moving to a position on its right side — the opposite side from where he was — and the angle she'd chosen was specific.
She was going to pull its attention.
She understood the fight. Without being briefed, without being told the plan, she'd watched the last four exchanges and worked out what he needed and was doing it. Not attacking — she knew her blades wouldn't do meaningful damage to four meters of animated stone. Just creating a second point of attention. Forcing the construct to track two targets simultaneously.
The specific angle she'd chosen would pull the right side's focus and leave the left side — the damaged side, the side where the core was closest — briefly exposed.
She looked at him once across the chamber.
He moved.
The construct committed to tracking Senna — the right arm beginning to orient toward her, the mass shifting, the weight redistributing toward that side.
The left side opened.
Lysander crossed the chamber in a straight line. His shoulder screamed. He filed it.
The core was visible — a slightly different shade of stone at the construct's center left, the original pillar material beneath years of accumulated corruption, exposed now by everything he'd stripped away in the previous exchanges.
He stopped two meters out.
Right hand on Kagekiri's hilt. Left arm hanging — the shoulder wouldn't support a two-handed draw. One hand would have to be enough.
A proper draw technique required both hands. One to draw, one to hold the sheath — the second hand's grip was what kept the draw angle clean, what gave the technique its precision, what made the motion a technique rather than just pulling a sword out fast. Without it the sheath moved with the draw, the angle shifted, the precision collapsed.
He knew this.
He drew anyway.
He breathed out.
Slowly. Completely silently. The void mana didn't rise with heat the way lightning did — it settled. The air around him went subtly still, a wrongness in the immediate space that had no visual explanation. Sound considered not traveling through it. The construct's slow turn toward the right side continued, committed, unaware of what the stillness meant.
His drawing hand rested on the hilt without gripping.
His weight centered — not forward, not back. Perfectly balanced. Every preparatory movement dissolved. His body became completely still in a way that living things almost never were.
The stillness was the warning.
The void energy concentrated along the line between him and the construct's core. The light in that specific path went slightly wrong — a consuming darkness that existed for a fraction of a second before the draw, like the space between blade and target was already being emptied of something in anticipation.
Void Draw — First Form: Abyssal Sever.
The draw was a single line.
Kagekiri left the sheath and crossed the distance in a motion that the eye almost couldn't track — not because it was fast, though it was fast, but because it was so clean that the mind had nothing to catch on. No wasted movement. No arc. Just the most direct path from here to there. The sheath moved with the draw — it should have thrown the angle, should have broken the technique's precision — but his body compensated without being told to. The bone forging. The technique inscribed deeper than conscious movement. His right arm adjusted for everything his left arm couldn't provide, finding the correct path through muscle memory that had been remade for exactly this motion.
The void energy at the blade's edge met the corruption anchor.
And consumed it completely.
Click.
The sheath accepted the blade.
Inside Kagekiri, Nythera was silent for exactly three seconds.
Then — quietly, with the specific quality of someone who had trained someone and watched them do something they hadn't been trained to do:
"One hand."
Not a question. Not praise. Just those two words, carrying something she didn't name. The acknowledgment of someone watching the technique she'd put into his bones find a solution she hadn't given it.
The silence that followed was absolute.
Then — the construct began to come apart.
Not quickly. Four meters of animated stone didn't fall quickly. The core lost cohesion first — the original pillar material splitting along the corruption's former channels, the structural integrity it had provided to everything around it ceasing. The outer mass followed, section by section, the animation draining out of each piece as the mana anchor failed.
The floor shook as it settled.
Then stillness.