The Experimental Archite Xenogerm had finished integrating four hours ago, and Magnus still hadn't moved off the balcony.
The system had been unusually talkative about that one. Normally the metabolic efficiency is so bad that this Xenogerm would kill any person that uses it almost instantly. Then a long, faintly proud paragraph explaining that he'd be fine, on account of being a plane lord existence with Self-Sustaining Physiology, and that his metabolism would simply evolve to carry the load.
It had read like a warranty card written by somebody who very much did not want to be sued.
Ageless. Perfect Immunity. Tox Immunity. Never Sleep.
Kinda useless, all four. He'd been ageless since the second week. Immune to essentially everything since Aurelion's biolabs came online. Hadn't slept in months — a fact Shizuka refused to accept and kept trying to fix with tea.
But Deathless. And Superfast Wound Healing. Strong Melee Damage, Robust, Unstoppable.
Deathless was the one worth reading twice.
Because the system didn't hand out insurance for missions it expected him to walk. Deathless meant something out there was going to kill him, and the system had looked at that, and filed it under manageable.
That wasn't a gift. That was an actuary filling out a form.
"Right," he said, to nobody. "Great. Very reassuring."
He'd accepted it eleven minutes ago. He knew it was eleven because he'd checked. He'd checked because he was stalling. And he was self-aware enough to know that too, which was the annoying part.
Behind him, through the open balcony doors, the apartment made its evening noises. The flat knock of Saeko's bokken finding the tenth rep — she always breathed out on the tenth. Saya arguing with someone on a call, that particular pitch she got when she'd already won and was just enjoying it. Water running. Rika saying something too low to catch, and Shizuka laughing at it.
Magnus stood at the railing with his hands on cold metal and did not turn around.
Aurelion spread out below him, all of it lit. The Japanese district held its lanterns like it was proving a point. Further out the American blocks sprawled wider and rougher, and somebody down there had a barbecue going that he could smell from forty floors up, which struck him as both a fire code violation and the single best evidence that this place had actually worked.
People were living. Not surviving. Living. It had taken him two years to learn the difference.
And now he had to leave it, because somewhere out there a world was dying in a way the system didn't have a word for.
Saeko will notice first.
Not dramatically. Not with some psychic pang. She'd walk past the balcony tomorrow, register that the air was wrong, and file it. She'd say nothing for three days. Then she'd say something devastating over breakfast.
Saya would build a theory. Shizuka would worry and not mention it, which was worse. And Rika —
Rika would know tonight. Rika always knew.
Which was exactly why he wasn't going to go back in there and say goodbye. Because if he did, Rika would look at him with those flat sniper's eyes and ask how long, and he'd have to say I don't know, and then he'd be standing in his own kitchen negotiating with four women who had each personally survived the end of the world and did not rate his odds as highly as he did.
He'd lose that argument. He'd lose it in under a minute.
"Pause."
He said it quietly, almost conversationally.
The city stopped.
Not violently. It never was. The barbecue smoke held its shape mid-curl. The lanterns kept burning without flickering. Behind him the bokken hung at the top of its arc and Shizuka's laugh stayed exactly where it was, half out of her, waiting.
Magnus listened to the silence for three seconds.
Not regret. He didn't do regret.
Just the acknowledgment that this was the fourth time he'd left without telling them, and that one of these days that was going to cost him something he couldn't buy back with a planetary system and a research database.
He stepped away from the railing.
The world he arrived in was wrong before he finished arriving.
The sky did it first. It wasn't dark — dark would have been fine, dark had a cause, dark meant a sun somewhere else. This was thinner. Like someone had taken the light and stretched it until it went transparent in places. The horizon was there and he couldn't tell how far away it was, and after two years of building terrain from scratch, Magnus knew exactly how much work it took to break a horizon.
He stood still and let his senses go out.
Air: breathable. Stable. Nothing in it trying to kill him.
He breathed anyway. Breathless made it pointless — he'd stopped needing to years ago — but he'd kept the habit deliberately. Breathing gave him a clock. Without it he'd caught himself standing in one place for forty minutes once, thinking. Habits were load-bearing.
Then he noticed what the air wasn't doing.
No wind through anything. No insects. No birds, no distant animal, none of the low structural hum a living biosphere makes without ever asking permission. Not silence, exactly. Silence was empty. This felt pressed down. Like sound was being allowed out on a case-by-case basis.
Magnus crouched and put two fingers in the dirt.
It looked like soil. It came apart like soil. And it was wrong in a way that took him a second to name, because it wasn't rot — rot was fine, rot was a process, rot went somewhere. This stuff had started decomposing and then simply stopped, mid-sentence, and held. Grey patches where organic matter had gone soft and then just… waited. Decay without completion.
He rubbed his fingers together and didn't like the way it felt.
"Okay," he said. "So it's not a plague."
Plagues finished things. This world had been interrupted.
He stood, wiping his hand on his coat, and looked toward the smudge on the middle distance that was probably a settlement.
Then he heard it.
Not far off. Close. Close enough that he'd missed it, which meant either it hadn't been making noise until now or he'd been standing here with his fingers in the dirt playing soil scientist while something walked up on him.
He didn't turn. He listened first.
A drag. Wet. Uneven — one foot working, one not. And underneath it, an exhale. Regular. Patient. Coming from something that had no business exhaling.
Fine.
He pivoted.
It had been a person once, in the sense that a chair that's been through a fire was once a chair. The outline was right. Nothing else was. The spine had gone wrong somewhere below the shoulders — not broken, not injured, just assembled incorrectly, like whatever was operating it had been handed the parts without the diagram. Grey skin pulled tight over a face that wasn't using any of its muscles. It came at him with direction but no intent.
His brain supplied a word: shambler.
He didn't know where from. That was going to bother him later.
It reached for him and it was slow — genuinely slow, not tactically slow, its own body failing to deliver on what it wanted. Magnus stepped inside the reach and hit it once, at the base of the skull, at the angle that meant it didn't matter what was holding it together.
It dropped like the string got cut.
He stepped back before it landed. Not caution. He just didn't want it on his boots.
Then he stood over it and watched, for a full thirty seconds, to see if it would do anything.
It didn't get up. It didn't twitch. It lay there and started coming apart — and that was the part that made the back of his neck go cold, because it wasn't decomposing either. It was doing the same thing the soil was doing. Going soft, and stopping, and holding.
Whatever was in this world hadn't killed it. It had edited it. And then left it running.
Magnus looked back toward the settlement.
The world hadn't fallen. Falling was something worlds did on their own. This one had been altered, deliberately, by something that had a method — and something with a method had a source.
He started walking. Unhurried. His mind already laying out the shape of it: what he'd seen, what he hadn't, what he'd need to be wrong about before he'd trust any of it.
Behind him the shambler lay in the not-quite-rotting dirt, going nowhere.
There'd be more. He was sure of that.
Next time he'd let one get closer before he killed it.
Not hesitation. He was past that.
But in a world where everything he could see was lying to him about how it worked, understanding was the only thing he had that the enemy didn't.
And Deathless was starting to look less like an insult.