By the time Aiden reached the avenue, the district no longer looked built for humans.
The lanes had become channels of wrecked metal and fleeing bodies. A bus lay half across the intersection with its rear wheels still spinning uselessly. One taxi had climbed the sidewalk and smashed through a convenience store shutter. Smoke pushed low between the buildings, carrying hot dust, fuel, and the animal reek of things that had never belonged in the city.
He kept moving.
The first monster saw him and dropped from the bus roof.
It landed hard enough to crack the pavement, forelimbs spread wide, head low. Up close it was worse than it had looked from the side street. Its hide was slick in some places, dry and split in others, as if two different corpses had been stitched together badly. One eye was milk-white. The other fixed on him with a wet, insect patience that made no sense on something that size.
Aiden veered left before it committed.
The thing lunged anyway.
Its claws punched through the hood of an abandoned sedan where his chest had been half a second earlier. Car alarms erupted. Glass sprayed across the lane. Aiden snatched a broken side mirror from the ground as he ran and flung it into the creature's face.
Not to hurt it.
To buy one breath.
The mirror burst against its jaw. The monster flinched just enough for him to cut behind the crushed sedan, plant one foot on the bumper, and throw himself over the divider into the opposite lane. It was clumsy and desperate, but desperate was enough. He landed badly, felt pain shoot up his leg, and kept going.
Behind him, the monster hit the car hard enough to shove it sideways.
"Emergency response convoy entering perimeter," one of the Association drones announced overhead. Its voice stayed calm in the exact way a machine could afford to be. "All civilians proceed to the nearest shelter corridor. Hunters below authorized rank are prohibited from engagement."
There were no hunters in sight.
Only panic.
Ahead, the lobby of Iris's building had become a choke point. Office workers were trying to get out while others, bloodied or glass-cut, were trying to get back inside because the avenue had become worse than the stairwell. A revolving door spun uselessly against a body jammed halfway through. One security guard stood beside the shattered main entrance with a radio in one hand and blood soaking one sleeve. He kept shouting for people to move in orderly lines.
No one listened.
Aiden cut through the edge of the crowd.
Someone grabbed his arm.
"Don't go in there," a woman said. She looked about thirty, maybe younger under the dust. Her mascara had run down one side of her face. "The floors are collapsing."
"My sister's inside."
She let go.
Not because she accepted it.
Because there was nothing to say to that.
The security guard saw him moving toward the doors and stepped in front of him. "You can't go up. East stairwell is blocked above five. West side lost pressure in the walls. We're waiting for Association clearance."
"How long?"
The guard looked past him at the street, where something large moved behind the smoke. His face changed by a fraction.
"Too long," he said.
Aiden slipped past him before he could decide whether to stop him physically.
The lobby lights were still on.
That made it worse.
The polished floor was streaked with blood, shoe prints, spilled coffee, shattered glass, and sprinkler water that had started leaking from somewhere above. A digital directory screen flickered uselessly beside a decorative wall of black stone. One elevator stood open and empty. The other had stopped between floors. Someone inside was still hitting the emergency button over and over.
"Iris," Aiden said into the phone.
Static.
Then, faintly, "Aiden?"
He stopped for exactly one second.
"I'm inside."
Her breath caught on the other end. "No."
"East stairwell. Are you near it?"
"I think so. The exit sign is broken. There's smoke." A crash sounded somewhere near her. People shouted over each other. "Something came through the ceiling two offices down."
That narrowed it.
Not enough.
He abandoned the elevators and hit the east corridor at a run.
The stairwell door had been forced open and was now jammed against a dent in the wall. People were still coming down, not in a line anymore but in bursts, stumbling into one another on the landings. A man in torn office clothes barreled into Aiden chest-first and almost threw both of them down the steps.
"Move!" the man shouted.
Aiden sidestepped, caught the rail, and kept climbing.
Every floor smelled different.
The third reeked of insulation and hot wiring. The fourth smelled like dust and burst pipes. On the fifth, he heard something heavy slam into concrete hard enough to shake the stair rail under his hand.
People were no longer coming down from above.
That was not a relief.
It meant the flow had stopped.
He reached the landing between five and six and found out why.
The stairwell wall had split from floor to ceiling. Not open, not fully, but enough for gray powder and cold air to stream through a crack wide as his hand. Through it he could see part of the city outside, skewed and wrong through fractured support beams. Far below, the avenue flashed with siren light and moving shadows.
Then something hit the far side of the sixth-floor door.
The metal bowed inward with a scream.
Aiden froze.
Another impact followed immediately.
The hinges tore loose.
The door slammed into the stairwell and skidded across the landing, trailing sparks. Behind it stood a creature the size of a large dog, but wrong in every proportion. Too long through the torso. Hind legs bent high and backward. Skin stretched taut over visible ribs. Its mouth opened sideways instead of down.
Rank did not matter.
Teeth did.
It launched at him.
Aiden did not try to fight it. He grabbed the fallen door with both hands and rammed it upward by instinct more than plan. The monster hit the metal slab mid-leap. The impact blasted pain through his shoulders, but the angle turned it sideways. It crashed into the bent rail instead of into him, legs scrabbling for purchase on already twisted metal.
He shoved the broken section with everything he had.
Rusted steel snapped.
The creature went through the gap. For a fraction of a second its body hung there, claws cutting sparks from the remaining rail.
Then it dropped.
The scream echoed down the hollow of the stairwell until it ended somewhere below with a wet crunch he did not let himself think about.
Aiden stood still for one breath, both hands locked on the bent fire door.
He was not shaking yet.
That would come later.
His phone crackled. "Aiden?"
He dropped the door.
"Still here."
Her exhale was so sharp it almost sounded like a sob, but Iris did not cry. Not like that. "I can hear something in the hallway."
"Which side?"
"Left. No, wait." Something scraped over tile. Too slow to be a person running. Too heavy to be office furniture falling over. "Aiden..."
"Lock yourself in if you can."
"I already did."
He started up again.
The sixth floor was dark beyond the ruined doorway. Ceiling panels had collapsed in a ragged line. Sprinkler water ran down one wall in thin streams. A printer lay overturned in the corridor like it had tried to flee with everyone else. A handprint in blood marked the glass of a meeting room door.
He kept to the stairwell side and moved fast.
At the next landing the building lurched so hard he hit the wall shoulder-first. Somewhere above, concrete cracked with a sound too deep to belong to office construction. He tasted dust immediately.
The concrete ceiling groaned again. Whatever had opened over the avenue had done more than bring monsters through. It had gone down into the bones of the building.
Seventh floor.
The corridor beyond the east stairwell had once tried to look expensive. Frosted partitions. Gray carpet. Recessed lights. Now half the ceiling was open, exposing broken ductwork and hanging wires. One side of the hall had caved inward toward the exterior windows. The other was lined with office doors, some hanging open, some blocked by desks shoved there in a panic.
"Iris."
No answer from the hall.
Then, through the phone, close enough now to locate, "Here."
He turned left.
Three doors down, a woman was trying uselessly to drag an unconscious coworker across the carpet. She looked up, saw him, and pointed with a trembling arm farther into the corridor. Beyond her, the glass wall at the far end had blown inward. Wind pushed papers through the hall in frantic white bursts.
"There was another one," she said. "It went that way."
Aiden did not answer. He was already moving past her.
The office with the broken exit sign stood near the corner. The door had been shoved shut from the inside with a wheeled filing cabinet and two chairs. He hit it once.
"Iris."
Something slammed into the wall on the other side of the corridor.
Not inside her office.
Across from it.
Plaster burst outward. A limb punched through first, narrow and slick with black fluid. Then a head followed, forcing its way through the broken partition with the stubborn violence of something that did not understand walls and therefore had no respect for them.
It was bigger than the one from the stairwell.
And faster.
The woman behind him screamed. The sound cut off when she clapped both hands over her own mouth.
"Aiden," Iris said from behind the barricaded door, voice thin with terror now. "Aiden, what is that?"
He looked at the creature.
It looked back.
For one suspended second, the corridor went perfectly still.
Then the floor gave way.