Nobody moved for a long time after Voss finished talking.
Then Leon did.
"The four who died," he said. "How long did they have?"
Voss regarded him. If she was surprised that his first question was operational rather than emotional, she didn't show it.
"The fastest destabilization was eleven days. The slowest was seven months. The difference was management—how well the carrier learned to balance the integrated energy against their Origin Force." She spoke like someone delivering a field report. No softening. No comfort. "The two who survived did so because they found equilibrium. The unnamed energy and Origin Force can coexist, but only if neither dominates. If the unnamed energy expands faster than the Origin Force can stabilize it—"
"Core collapse," Serath finished. Her voice had steadied. The analytical mind was back online, processing data instead of feeling it. "The unnamed energy cannibalizes the Origin Force. The core loses structural integrity. Cascade failure."
"Correct."
"And you have a method to prevent this," Serath said. Not hoping. Demanding.
"I have a framework. It's imperfect. The two survivors adapted it to their own physiology—what worked for one didn't work identically for the other." Voss looked at the three of them. "You are three different races with three different energy architectures. The integration will behave differently in each of you. What I can teach you are principles. Application is yours."
Asha stood from her knee. Full height. Seven feet of Oni looking down at an instructor who barely reached her chest. "When do we start?"
"Now." Voss turned toward the passage she'd entered from. "Follow me. Not to the surface—there's a training space on this level that's shielded from the Academy's sensor grid. We'll use it until you're stable enough to mask the integrated signature."
She walked. They followed.
Leon fell into step beside Serath. Kept his voice low.
"You okay?"
She glanced at him. Something flickered across her expression—surprise, maybe, that he'd asked. "I'm functional. The integration disrupted my cycling rhythm. I'll need to rebuild my meditation framework around the new energy architecture." Clinical. Precise. But her hands were still trembling, and she tucked them into her sleeves when she noticed him noticing.
"Serath."
"What?"
"You don't have to be functional right now."
She looked at him for a long moment. The silver eyes, always so controlled, held something raw underneath. Fear, maybe. Or the effort of not showing it.
"Yes," she said quietly. "I do."
She walked ahead.
The shielded space was smaller than the chamber—a rectangular room with walls lined in the same black stone, veins dormant. No windows. No sensors. A sealed box buried in the earth.
Voss stood at the center.
"Sit."
They sat. Cross-legged. Triangle formation, facing inward. It felt ritualistic, which Leon didn't love, but he'd stopped arguing with situations that were bigger than him about three sub-levels ago.
"The integrated energy has no official name," Voss began. "The institutional term is Remnant-class, but that's a bureaucratic label, not a description. What it actually is—where it comes from—is a question that predates the Academy, the city, and the current age."
She held up a hand before Serath could speak. "I'm not withholding information. I genuinely don't know. What I know is what it does."
She paced. Even here, her gravitational presence filled the room.
"Origin Force is stable. It cycles, it reinforces, it grows predictably. The unnamed energy is not stable. It doesn't cycle—it flows. It doesn't reinforce—it transforms. And it doesn't grow predictably. It grows in response to stimulus. Pressure. Danger. Emotional extremity." She stopped. "That's why the four died. They encountered pressure—fights, breakthroughs, crises—and the unnamed energy surged in response. Surged faster than their Origin Force could compensate. The imbalance destroyed them."
Leon felt the dual currents inside him. She was right—the Origin Force moved in its familiar circuit, loop after loop, steady and measured. The unnamed energy didn't loop. It pooled and shifted, congregating where his attention went, responding to his emotional state with a sensitivity that his Origin Force had never shown.
Right now, he was tense. And the unnamed energy had gathered in his chest and fists like it was preparing for a fight he hadn't started.
"So we need to keep them balanced," Leon said. "Origin Force grows through cycling. The unnamed energy grows through stimulus. If we cycle enough to match the unnamed energy's growth—"
"You'll exhaust yourselves. The unnamed energy grows faster than Origin Force can be cultivated through normal means." Voss cut him off without apology. "The answer isn't matching growth. It's integration control. You need to learn to cycle them together—as a unified current, not two competing streams."
"Dual cycling," Asha said.
"Yes. And it will feel wrong. Your body knows how to cycle Origin Force. It does not know how to cycle the unnamed energy. Forcing them into the same circuit will create friction. That friction generates heat. Too much heat—"
"Pathway damage," Leon said. He thought of Syl. Dark veins. Dead channels. A different cause, the same result.
"Yes." Voss looked at him. Held his gaze a beat longer than necessary. "Begin with your core. Find both currents. Don't try to merge them yet—just hold them simultaneously. Get used to the weight."
Leon closed his eyes.
Finding his Origin Force was routine. It sat in his core—denser now, the compressed walnut expanded into something closer to a small fist. The integration had added mass. Or maybe released mass that had always been there, locked behind the suppression.
Finding the unnamed energy was different.
It wasn't in his core. It was around it. Threaded through the spaces between his meridians, occupying gaps in his energy architecture that he'd never known existed. Not parasitic—complementary. Like discovering his house had rooms he'd never opened.
He held both in his awareness. Origin Force: steady, cool, structured. Unnamed energy: warm, fluid, reactive. Two currents in the same body, running parallel, occasionally brushing against each other at the boundaries.
Where they touched, he felt friction. Voss was right—it was heat. Not painful yet. But present. A low-grade burn at every intersection point.
"I feel it," Asha said. Her voice was distant. Deep in concentration. "It's like holding two conversations at once."
"Don't try to merge them," Voss repeated. "Just hold. Build tolerance for the dual state. Your body needs to accept that both currents are permanent before you attempt integration cycling."
Leon held. Minutes passed. The heat at the intersection points grew. Slowly. Steadily. His instinct was to suppress one or the other—to clamp down on the unnamed energy the way he'd been doing for years. But suppression wasn't an option anymore. The integration had woven it too deeply into his system. Suppressing it now would be like trying to remove thread from fabric without unraveling the cloth.
So he held. And burned. And kept holding.
After what felt like an hour, Voss called a stop.
Leon opened his eyes. His shirt was soaked through. His core ached in a way he'd never felt before—not the grinding pain of compression, but a stretched, raw feeling. Like a muscle worked past its limit for the first time.
Serath looked composed. Pale, but composed. Her cycling discipline gave her an advantage here—she was used to sustained internal focus.
Asha looked like she'd been meditating in a sauna. Sweat ran down her grey-blue skin in rivulets. But her expression was calm. Almost peaceful.
"Again tomorrow night," Voss said. "Same time. Same place. Don't attempt dual cycling on your own until I clear you. The friction will damage your pathways if you push without guidance."
"The assessment is in five days," Leon said.
"I'm aware."
"My suppression is gone. My energy signature has changed. If I walk into a combat assessment with an unclassified energy running through my meridians—"
"You'll need to learn to mask it." Voss said it like she was telling him to tie his shoes. "The unnamed energy responds to intent. If you don't want it seen, it can learn to hide. But you have to teach it."
"Teach it."
"It's not inert, Leon. It's not a tool. It responds, it adapts, it learns. Treat it like a living thing that shares your body, because that's the closest analogy that's accurate."
A living thing. Sharing his body. That wasn't unsettling at all.
"And if I can't mask it in five days?"
Voss looked at him with an expression he couldn't read. Not pity. Not concern. Something older.
"Then the assessment will be the least of your problems."
They climbed back in silence. Asha peeled off at sub-level seven—her dormitory was on a different corridor, and she moved through the dark like she'd been born in it. Serath continued to sub-level four without a word. Whatever she was processing, she was doing it behind walls that Leon couldn't see over and wasn't invited to try.
Leon reached the Iron-rank level alone.
His room was dark. Cold. The cot was exactly as uncomfortable as it had been that morning, but everything else had changed. His core hummed with two frequencies. His meridians carried two currents. His body was a house with new rooms that he didn't have keys to yet.
He lay down. Closed his eyes.
The unnamed energy settled as his breathing slowed. Not dormant—present. Attentive. Like a cat curling up at the foot of a bed, aware of every sound but choosing stillness.
A living thing that shares your body.
Leon addressed it for the first time. Not out loud. Internally. A thought aimed inward, toward the warm current that had lived inside him for as long as he could remember.
I don't know what you are. I don't know what you want. But if we're doing this—if there's no going back—then I need you to work with me. Five days. Hide when I need you to hide. Move when I need you to move. And don't kill me.
Silence.
Then—not a word, not a thought, not anything as coherent as communication—a feeling. Brief. Unmistakable.
Agreement.
The warmth in his chest shifted. Settled. Grew quiet in a way that felt deliberate. Chosen.
Leon exhaled.
Okay then.
He was almost asleep when the knock came.
Soft this time. Knuckles, not palm. Three taps.
He opened the door.
Ren stood in the hallway. Face tight. Eyes sharp. He didn't speak until Leon stepped back to let him in. Then he closed the door behind him and kept his voice at a whisper.
"Something happened tonight."
Leon said nothing.
"Your presence changed. I felt it from my room—a shift, like the air pressure dropped and came back different. You went somewhere." Ren's ember eyes searched his face. "And you came back carrying something you didn't have before."
Leon considered lying. Considered deflection, misdirection, the tools that had kept him alive in places worse than this.
Ren had warned him about the pulse. Had trained beside him without asking for anything. Had sat with him in silence when silence was what he needed.
"Yeah," Leon said. "I did."
"Is it going to be a problem?"
Leon thought about four dead carriers. About core collapse. About an assessment in five days with an energy system he'd had for six hours.
"Probably."
Ren leaned against the wall. Crossed his arms over his scarred forearms. Looked at Leon the way he had that first day in the mess hall—steady, evaluating, deciding whether to stay or go.
He stayed.
"Then we deal with it." He said it simply. Like it was obvious. Like problems were just things that happened to people who stood near each other long enough, and leaving wasn't part of his vocabulary anymore.
Leon felt something loosen in his chest that had nothing to do with energy and everything to do with the specific, unfamiliar weight of someone choosing to stay.
"Ren."
"Yeah?"
"The assessment. I'm going to be seeded last. Worst bracket. I'll fight Serath first round, and my energy system is five days old. I need a sparring partner who won't ask questions about what they see."
Ren smiled. It was the first time Leon had seen him do it. The scars on his arms caught the dim light.
"I thought you'd never ask."