The morning after the surge, Jin sat alone in his room, the Brilliance Tree's yellow glow casting long shadows across the walls. The others were training, testing their new abilities, pushing their Summons to understand the limits of what the second wave had given them.
Jin had his own experiment to run.
He sat cross-legged on the floor, a small piece of copper pipe resting in his palm. It was a fragment from the plumbing he had stripped weeks ago, back when he was feeding Fidex everything he could find. Common metal. Low compatibility, but enough to test with.
He closed his eyes and reached for the Crimson Book. It appeared in his mind as it always did—cold, vast, waiting. But something was different now. The connection felt deeper, more intimate. And when he focused on Fidex's page, he felt something new pulsing beneath the surface.
His Fusion ability. The unique power that had first awakened when he bound Fidex, the power that let his Summon absorb materials and grow stronger. It was still there, still thrumming through the Contract. But now it felt... larger. As if the boundaries that had contained it had expanded.
Jin focused on the copper pipe in his hand, on the familiar sensation of Fusion. He could feel the metal's composition, its density, its weight. He could feel how it would flow if directed into Fidex, how it would settle into the Summon's flesh and become part of it.
And he could feel something else now. A branching path. The same Fusion energy, but directed inward. Toward himself.
The knowledge came not from the Crimson Book's prompts, but from the deep well of his own power. The ability had grown. It was still his—still tied to Fidex, still part of the Contract that bound them—but now it offered a new channel. A new possibility.
Jin's heart beat faster. He focused on that inward path, testing its edges, feeling its shape. The copper in his hand seemed to warm, responding to the call. He could almost see it: the metal dissolving, flowing into his skin, becoming part of him.
He pulled back.
The sensation faded. The copper cooled. Jin opened his eyes, breathing hard.
It was real. The Fusion ability had evolved. He could fuse materials into himself now. Not through a new page in the Crimson Book, not through a different system—but through the same power that had let him strengthen Fidex from the beginning. It was his ability. It had grown with him.
And he wasn't sure he wanted to use it.
He stared at the copper pipe in his palm. All he had to do was reach for that inward path again, let the Fusion take hold. The metal would dissolve into his flesh, just as it had with Fidex. He would become stronger, harder, more resilient. The same process that had given his Summon metallic skin, claws, the ability to tear through concrete—it could do the same for him.
He thought about the Spider Monster, about the way Fidex had screamed when the flesh began to fuse. The sound had been inhuman, but the pain was real. Jin had felt it through the Contract, a dull echo of his Summon's agony. The metal had been worse—not the same sharp, tearing pain of flesh, but a slow, grinding pressure, like being compressed from all sides.
And Fidex had recovered. The Four-Armed Corpse had absorbed the materials and grown stronger. The pain had faded, replaced by new capabilities, new strength.
But Fidex wasn't human. Not anymore. It had been Jin's roommate once, a person with a name and a face and a life. That person was gone, transformed by the red light into something else. Something that could absorb metal and flesh and keep going, keep evolving, keep becoming more monster than man.
Jin looked at his own hands. They were human hands. They still bled when cut, still ached when overworked. The synchronized Metal Body had changed that somewhat—his skin was tougher now, resistant to cuts and impacts—but underneath, he was still flesh and bone. Still human.
For now.
He looked at the copper pipe again, turning it over in his fingers. The ability pulsed at the edge of his awareness, waiting. Patient. He could feel it—the metal's potential, the way it would flow into him, the strength it would grant. But he also felt the weight of what that strength might cost.
He had seen what the fusion process did to Fidex. The Four-Armed Corpse was powerful—terrifyingly so—but it was also undeniably a monster. Its form had twisted, its humanity stripped away piece by piece with each fusion. Four arms where two had been. Metal skin where flesh had once covered bone. Claws where fingers should have been.
Was that what waited for him? A gradual erosion of everything that made him human, until he was just another creature wearing a familiar face?
He thought about the survivors in the building, the way they looked at him now. Fear and respect, yes, but also something else—a wariness, an uncertainty. They didn't see him as one of them anymore. He was something else, something powerful and dangerous. Something that had killed six people and thrown their bodies into the courtyard without hesitation.
If he started fusing materials into his own body, what would they see then? What would he see in the mirror?
Jin set the copper pipe down beside him. The ability receded, folding back into the depths of his connection to Fidex, waiting for another time.
Not yet.
He needed to understand what self-fusion would do to him before he committed to it. Fidex was already lost. The thing that had been his roommate was gone. What remained was a weapon, a tool, a Summon. It could be shaped and molded without consequence beyond the physical. The pain it felt during fusion was real, but the thing that felt it wasn't human anymore. It didn't have humanity to lose.
Jin still did.
He was human. Altered, yes—the synchronized Metal Body had changed him, given him strength and durability that no normal person possessed. But that was different. Synchronization was a gift from the Contract, a reflection of Fidex's power that had been filtered through the Crimson Book. It hadn't required him to absorb foreign matter into his flesh. It hadn't demanded that he become something other than what he was.
Self-fusion was different. It was his power, his choice, his body. And once he started down that path, there was no going back. Every fusion would change him. Every material he absorbed would become part of him, reshaping him in ways he couldn't predict.
He thought about the different materials he had fused into Fidex. Common metal had given the Summon claws, then metallic skin. The Zombie Flesh had granted Rapid Healing and transformed Fidex's form, giving it four arms instead of two. The Spider Monster's essence had woven something new into its instincts, a warning sense that flickered at the edge of perception.
What would those things do to a human body? To a human mind?
The metal would harden him, yes. But would it also make him heavier? Slower? Would it spread through his organs, his blood, turning him into something that only looked human? The Zombie Flesh came from corpses, from things that had once been people. If he fused that into himself, would he start to lose pieces of who he was? Would he forget his own name, his own life, his own reasons for fighting?
And the Spider Monster's essence—that was something older, stranger. It had given Fidex a kind of precognition, a ghostly warning against incoming attacks. But it had also changed the way Fidex moved, the way it held itself. Something had been added to its nature that wasn't there before.
Jin wasn't ready to add anything to his own nature. Not yet.
He needed to study it first. Watch how Fidex continued to change with each fusion. Learn what the limits were, what the costs were, what parts of a being survived the process and what parts were erased. Fidex was the perfect test subject—already transformed, already beyond humanity. Every fusion that Jin performed on his Summon would teach him something about what self-fusion might do to him.
And when he knew enough—when he understood the risks, the consequences, the shape of the path ahead—then he would decide.
---
A soft knock came at the door. Mark's voice followed: "Jin? Lisa and Simon are here too. We need to talk."
Jin rose, crossing to the door and opening it. The three of them stood in the hallway, their faces carrying the same expression—curiosity mixed with something deeper. They had all felt the surge. They had all changed.
"Come in," Jin said, stepping aside.
They filed into the room, taking seats around the desk where the Brilliance Tree glowed softly. Mark's eyes caught the copper pipe on the floor, then moved to Jin.
"We've been talking," Mark said. "About what happened. The surge. The new abilities. We all got something. Lisa can see through her Rat's eyes now. Simon found out he gets harder to kill the longer he fights. And me—I can sense what my Summon is going to do before it does it. Like we're thinking the same thoughts."
He paused, his expression serious. "We were wondering about you. Your ability—the Fusion thing. Did it change too?"
Jin looked at them. Mark, who had grown from an out-of-shape programmer into someone who could face down monsters without flinching. Lisa, whose sharp mind had saved them more times than he could count. Simon, who carried the weight of a son he couldn't save and still stood strong.
They had earned the truth.
"It changed," Jin said quietly. "Before, I could only fuse materials into my Summon. Now... I can fuse them into myself."
The room went silent. Simon's eyes widened. Mark leaned forward, his expression intense. Lisa was the one who spoke first.
"You can fuse things into your own body?"
"Yes." Jin picked up the copper pipe, turning it over in his hands. "Metal. Flesh. Whatever the system considers fusible. The same process that gave Fidex its claws, its armor, its healing—I could give it to myself."
Mark let out a low whistle. "That's... that's huge. Why aren't you doing it? With that kind of power, you'd be unstoppable."
"Because I don't know what it does to a person." Jin set the pipe down. "I've fused metal into Fidex. I've fused Zombie Flesh. I've fused monster essence. And every time, Fidex changed. It got stronger, but it also got less... human. Its form twisted. Its body became something else. If I start fusing things into myself, what happens to me? Do I stay the same person? Or do I become something that only looks human on the outside?"
Simon's jaw tightened. He understood better than the others. He had seen what the red light did to people. He had locked his own son in a room because the thing wearing Marcus's face wasn't his son anymore.
"You're afraid of becoming a monster," Simon said. It wasn't a question.
Jin met his eyes. "I've already done monstrous things. I killed six people three nights ago. I ordered it. I watched it happen. I didn't feel anything." His voice was flat, clinical. "If I start changing my body—if I start fusing metal into my skin, corpse flesh into my bones—what's left? What part of me is still human after that?"
Lisa reached out, touching his arm. "You're not a monster, Jin. You did what you had to do to keep us alive."
"Maybe. But the line is thinner than I thought." He looked down at his hands. "The synchronized Metal Body already changed me. My skin is tougher. I'm stronger than any normal person. But that was a gift from the Contract—a reflection of what Fidex already was. Self-fusion is different. It's me choosing to change myself. Choosing to become something else."
He picked up the copper pipe one more time, then set it aside with finality.
"I'm not ready for that. Not yet. Fidex can be my test subject. I'll keep fusing things into it, see how the process works, see what changes and what stays the same. And when I understand it well enough—when I know I'm not going to lose myself in the process—then I'll decide."
Mark nodded slowly. "That's smart. Rushing into something like that... we've seen what happens to people who grab power without understanding it."
"You could have kept this secret," Lisa said quietly. "You didn't have to tell us."
Jin looked at her, then at Simon, then at Mark. "We're in this together. If I'm going to lead, I need you to trust me. And trust works both ways." He paused. "Besides, if something goes wrong—if I do decide to try it and it doesn't work the way I think—I need people around me who know what's happening. Who can pull me back if I start to... slip."
Simon's expression softened. "We've got your back, Jin. Whatever you decide."
"Always," Mark added.
Lisa squeezed his arm before letting go. "Just don't turn into something ugly, okay? I've gotten used to looking at you."
Jin let out a short laugh—the first genuine one he'd felt in days. "I'll try."
---
A knock came at the door. A voice from the hallway: "Jin, you need to see this. The fog is clearing. I mean really clearing."
Jin exchanged a glance with the others, then moved to the door. When he opened it, one of Nathan's security men was standing there with a look of disbelief on his face.
"Come on. Nathan is already downstairs. Everyone's gathering."
They moved through the hallway to the stairwell, descending quickly. The first floor lobby was crowded when they arrived—Nathan, Frank, Zack, George, and a dozen other survivors who had come to see the impossible.
The lobby doors were open.
Beyond them, the fog that had pressed against the building for two weeks was retreating. Not thinning—retreating. It rolled back like a tide pulling away from shore, revealing the parking lot, the security booth, the street beyond. Visibility stretched for fifty meters, then a hundred. Jin could see cars rusting in their spaces, trees with leaves turned gray, a billboard advertising a restaurant he'd never visited.
And in the distance, the vague shapes of other buildings, emerging from the mist like ghosts made solid.
"What the hell is happening?" Nathan breathed.
Jin didn't answer. He was watching the fog retreat, feeling something cold settle in his chest. The second surge had changed things. Changed the fog. Changed everything.
Beside him, Mark stepped forward. "We're going out there. Tomorrow. We need water, supplies, answers."
Nathan turned to look at him, then at Jin. "Is that the plan?"
Jin nodded slowly. "The fog is clearing. Whatever caused it, whatever the surge did—we can't hide in this building forever. We go out. We see what's left. And we figure out how to survive it."
He looked at his team—Mark, Lisa, Simon—and saw the same resolve in their faces. The same understanding that the world had changed again, and they had to change with it.
Tomorrow, they would step outside. And Jin would still be human when he did.
For now, that was enough.