The transport came to a stop at coordinates that did not exist on any Elysion survey grid, which was precisely the point. Delta was already out of the vehicle before the ramp fully lowered, reading the terrain with the focused efficiency of someone cataloguing variables rather than scenery. Signal moved past her without instruction, taking the north approach by instinct, and between the two of them they had the entrance covered in under a minute.
The entrance itself was a crack in the substrate wall, ancient and deliberate—a sealed service corridor whose pressure seals had failed decades ago, the metal around the edges showing the pale, preserved quality of something that had been shielded from the surface's slow biological contamination. Neon stood beside it with the proprietary ease of someone who had found a thing and quietly decided it belonged to her.
"Same configuration as the last approach," she said, as Arthur came to stand beside her. "You'll want to stay low until the first interior corridor opens up."
Arthur looked at Delta.
"We hold here," Delta said. "If you're not back in four hours—"
"Three," Signal said, from the north approach, without looking up from her scope.
"Three hours," Delta amended, "then we escalate." She met Arthur's eyes. "Come back with something useful."
Arthur turned toward the crack in the wall. The Blood Dragon's T-visor caught the dim transport light and threw it back in a thin red line, and for a moment the armor did what Harper had designed it to do—it made him look like something other than a man who had fractured two ribs and lost an arm two weeks ago.
The team filed in behind him.
The Lost Sector opened into the same dissonance Arthur had encountered before, in that earlier sealed place months ago when Gayle had been waiting in the dark with her borrowed Rapture anatomy and her hundred years of silence. White prefab buildings, perfectly symmetrical, arranged along corridors that implied a city block without committing to one. The surfaces were clean in the way that only pressurized atmosphere seals could maintain over decades—not sterile, exactly, but preserved. The kind of clean that felt wrong because nothing in the living world stayed this way.
"It's like a film set," Flower said, touching the corner of a building as they moved past it. "Like someone built the outside and didn't bother with the inside."
"Prefab deployment shells," Miranda said, from Arthur's left. "Central Government used them in the early consolidation period. You fill them with whatever function you need. Research, housing, logistics." She was scanning the upper levels of the structures as she walked, her eyes moving in the methodical pattern of someone who had done threat assessment for long enough that it had become automatic. "The real infrastructure is underground."
"Sub-four," Neon confirmed, from the front. She was moving with the same port-arms carry from before, the shotgun easy in her grip, head tracking left-right in a rhythm that was either training or habit—Arthur suspected both. "Heavy weapons down there. I really did put most of them back."
"I believe you," Ocean said, with the serene delivery she brought to statements that could have been sincere or gently devastating. Flower pressed her lips together and looked at the ceiling.
Behind Arthur, V walked beside Neon with the patient expression of someone who had decided to experience something rather than resist it. Neon had been explaining, in considerable detail and with evident enthusiasm, the relative stopping power of three different shotgun configurations against armored Rapture variants. V had not interrupted her once, which was either courtesy or fascination, and Arthur suspected the latter.
Further back, Voltia and Cora walked together in the way of people who have been placed in proximity by circumstance and found, to their mild surprise, that the proximity was not uncomfortable. Cora was watching the architecture with the careful attention she brought to everything unfamiliar. Voltia's bunny-eared helmet tilted slightly as she read the structural angles—the helmet's lower edge stopped just above her jaw, leaving her mouth visible, the dark blue of her bodysuit moving in the clean white light of the corridor with an effect that Arthur became aware of and then was aware that he had become aware of, which he filed under *later* and kept moving.
The screech came without warning.
It arrived as a sound first—not the sustained shriek of an ambush trigger but the shorter, higher, hunting call of something coordinating—and then the buildings disgorged them.
They came through the prefab walls in the way Raptures used sealed spaces, not through doors but through the material itself, the weaker composites shearing like foil under the force of things that had been waiting with the particular patience of machinery. Ant-types first, small and fast, swarming the corridor floor in numbers that made individual targeting irrelevant. Behind them, wallers with their curved shields up, optical sensors low, advancing in the stepped rhythm of a formation that had processed the terrain before entering it. From the upper levels of the prefabs, moon-eye variants dropped into elevated positions, the electric whips coiling out from their forearm mounts with a crackling sound like splitting wood. And overhead, the drones—small, fast, angled, taking their first ranging shots before the team had fully processed the shape of the engagement.
And then the Tyrant landed.
It came down from somewhere above the prefab rooflines with enough velocity that the impact shook the corridor floor through Arthur's boots, and it stood three meters tall in black armor that had the look of something grown rather than built—segments overlapping like beetle carapace, no visible joint where you'd expect one, two hands ending in curved blades that were each the length of Arthur's forearm. Its eyes were red and furious and arranged in a way that suggested more than two but resolved to two when you looked directly at them. The wings—black, raven-vast, folding against its back as it landed—threw a shadow across the corridor that stretched the full width of the space.
Neon said, with absolute conviction, "*Taste my firepower,*" and walked directly toward the ant-types with her shotgun at her hip.
The first blast took seven of them in a spread pattern. She pumped and fired again before the echo finished and the second shot cleared a lane through to the wallers. She was moving forward the entire time, which meant the Raptures behind her problem were becoming the Raptures between her and the problem, and Arthur marked her position on the HUD and kept it there.
Voltia *moved.*
It was the most accurate verb Arthur had available. She didn't advance, she translated—from standing to engaged so quickly that the first three ant-types that targeted her processed empty space while she was already at their flank, the assault rifle cycling in bursts with the cracking rhythm of someone who had learned the exact intervals that mattered. The dark blue of her armor blurred against the white corridors and Arthur could see it beginning—the faint corona at her shoulders and hands where the kinetic energy of her movement was becoming something else. Something that built. One of the moon-eyes turned its whip toward her and she was simply not where the whip arrived, and the electricity that should have caught her instead discharged into a waller's shield and blew the shield apart.
She hit the Tyrant at full charge.
The electricity that had been accumulating through sixty seconds of impossible speed discharged on contact in a column of blue-white that lit the corridor like a flash photograph, and the Tyrant went back two steps. Two steps. From Voltia.
Cora was already moving to cover her, the Cerberus shotgun firing at the Tyrant's armored kneeline while one hand described a short arc and a biotic pulse hit the Tyrant's right shoulder and staggered it left. Not enough. Enough to matter.
V, for the first time in a long time, had the sniper rifle up rather than the katana. She was using the prefab roofline as her position, three stories up via a running wall-climb that had been quieter than it had any right to be, and the rifle was speaking in the measured cadence of someone working a precision problem. Each shot hit the Tyrant's optical cluster—not destroying it, the armor was too dense, but forcing the tracking recalibration that burned processing cycles.
Flower and Ocean moved the way they always moved, which was to say in the coordinated pattern of two people who had been in proximity long enough that one's reaction had become part of the other's intention. Flower's suppressive fire kept the waller formation from closing on Arthur's left; Ocean's launcher spoke twice and reduced the drone formation overhead from six to two.
Miranda was a step to Arthur's right, the compact SMG firing in tight bursts at the ant-types breaking through Neon's advancing corridor while her free hand gestured in the short, precise motions of biotic deployment. A barrier bloomed between Arthur and the moon-eye formation's second whip volley and the electricity hit it and spread harmlessly across the field surface.
"Left," she said.
Arthur was already turning.
The Tyrant came from the air—wings spread, pulling a full drop trajectory, the two blades angled for a split guard that would have been very difficult to survive if you hadn't spent six months learning to read the geometry of Tyrant-class approaches. Arthur read it and brought the Omni-blade up in a crossed guard, both arms locking, the prosthetic's enhanced feedback transmitting the full force of the impact up through his shoulder and into his healing ribs with a sensation he chose not to categorize.
The blades met the Omni-blade's edge and stopped.
The Blood Dragon's shielding flared along the chest plate, the silver-red composite absorbing the force that the guard hadn't and Arthur dug one goddesium foot into the corridor floor and *held.*
Then Voltia hit the Tyrant from the left, and Neon hit it from the right, and Cora's biotic pulse caught its spine from behind, and it was no longer a question of whether but of when.
The when took eleven more minutes.
Arthur bled from a shallow cut along his left shoulder where a blade tip had found the gap between armor. He had pulled Cora out of a wing-sweep that would have taken her off her feet. He had physically stepped in front of Voltia during the Tyrant's second charge and let the Blood Dragon's shielding do the work his ribs would have regretted doing alone. He had watched Neon take a blade impact on her left pauldron—the same stress fracture shoulder from before—and keep moving forward, jaw set, shotgun still firing.
When it fell, it fell in pieces.
The black armor cracked along the chest seam first, then the shoulder segments, then the plate along the anterior torso, each fragment dropping away with the sound of cooling metal until what remained beneath was not machinery at all.
She stood among the fallen armor in a light blue bodysuit the color of shallow water, black hair loose and moving in the corridor's disturbed air, the long katana in her grip so naturally that it seemed less a weapon than an extension of her posture. Her eyes were red—not the red of Rapture sensors, but the red of something that had once been otherwise and was not anymore. She was looking at Arthur with an expression that was not empty and not afraid and not anything he had a clean word for.
Everyone in the corridor had stopped.
V, from the roofline, said nothing. The sniper rifle did not move.
Arthur stood in front of the Heretic with the Omni-blade still lit and his bleeding shoulder and the Blood Dragon's visor between his eyes and hers, and the thought that arrived and refused to leave was not tactical.
The thought was: *she was someone, once.*
The Heretic the Raptures had been housing in that armor like a blade in a scabbard tilted her head, and the red eyes found his through the T-visor's narrow gap, and she said nothing. But the katana came up into a guard that was unmistakably deliberate. Unmistakably a choice.
Miranda's voice came from Arthur's right, quiet and precise: "Arthur. That's a Heretic."
"I know," he said.
"We need to know if that's all she is."