The Extra is a Genius!?-Chapter 519: Behind You

Marcus had lost track of how long they had been on the island.

Not because he hadn’t tried to count the days—but because the days refused to stay separate. One blurred into the next, broken only by combat, short rests, and the constant feeling of moving forward without ever truly arriving anywhere. Morning light felt the same as dusk here. Even sleep didn’t reset anything. He would wake up tired, fight, move, and repeat.

That was the only certainty that stuck.

The island fought back constantly, but never the same way twice. Monsters crawled out of cracked stone as if the land itself had grown teeth. Others emerged from pools of corrupted mana, half-formed things that screamed when they died and left nothing behind. Some beasts charged them openly; others vanished the moment they were struck, dissolving like smoke before Marcus could even register the kill.

They adapted.

Marcus fought on instinct now, movements sharp but heavy, his body responding faster than his thoughts. Roberto matched him step for step. Not effortlessly—never effortlessly—but with the same grind, the same strain. His breathing hitched after longer fights. His shoulders sagged when they stopped. He wiped blood from his weapons with the same tired irritation Marcus felt in his own chest.

That, at least, felt normal.

What didn’t was everything else.

No people. Not one.

They had crossed ruined roads, shattered watchtowers, collapsed buildings that had once been homes. Marcus had found remnants of daily life—broken tools, rotted furniture, scraps of cloth—but no bodies. No recent signs of flight. No evidence of evacuation or massacre. Just absence.

Silence.

It sat heavier than the monsters ever did.

Marcus noticed it most when they stopped moving. When the fighting paused and there was nothing left but wind scraping over stone and the distant hum of mana in the ground. In those moments, his skin prickled, and his eyes kept drifting to empty spaces, half-expecting something to step out and prove he wasn’t imagining it.

’Something’s watching us,’ he thought more than once.

He never said it out loud.

Roberto would glance around during those same pauses, jaw tight, expression focused in the same way Marcus knew his own probably looked. He wasn’t relaxed. He wasn’t careless. If anything, he looked just as worn down—just as alert.

He never hesitated. Whenever Marcus slowed, scanning the terrain, Roberto would already be moving, already choosing a direction with quiet certainty. Not recklessly. Not blindly. Just... sure. Like the island followed rules only he could see.

That should have bothered Marcus more than it did.

He told himself it was experience. Trust. The same reason he’d followed Roberto into worse situations before without questioning every step. They’d fought together long enough for that kind of reliance to feel earned.

Still, as they pressed deeper into the island, Marcus couldn’t shake the thought gnawing at the back of his mind.

Marcus felt her before he saw her.

The air shifted—not with sound or pressure, but with something heavier, like the island itself had drawn a slow, deliberate breath. His hand tightened around his weapon on instinct, muscles coiling before his thoughts caught up. Roberto slowed beside him at the same time, boots grinding softly against broken stone.

She stood ahead of them, where there had been nothing a moment before.

A woman. Around thirty-five, maybe older—it was hard to tell. Her skin was pale in a way that looked wrong, not sickly exactly, but drained, as if warmth had never truly settled in her body. A mask covered the lower half of her face, dark metal shaped smoothly around her mouth, hiding any hint of expression there.

Chains wrapped around her from neck to ankle.

Some were embedded directly into her flesh, vanishing beneath skin and reemerging elsewhere. Others floated freely, suspended as if gravity had decided she was exempt from its rules. They shifted and clinked softly despite the lack of wind, a sound that crawled under Marcus’s skin.

The air around her warped, bending subtly, like heat haze without heat.

Marcus opened his mouth to speak.

The words died before they formed.

His body locked up, every instinct screaming the same message at once. Danger. Not the sharp, immediate kind that came with charging beasts or incoming attacks—but something deeper. Older. An aura that didn’t need to threaten because it already was the threat.

She tilted her head slightly, as if amused by his hesitation.

"So," she said calmly, voice clear and measured, "you finally made it to this island."

Marcus forced his breath to steady. "Who are you?" he demanded, even as his pulse hammered. "What did you do to this place?"

Her shoulders lifted a fraction. "You’re late," she replied instead. "The others already came. The ones you were looking for." The chains shifted, tightening almost imperceptibly. "They didn’t last."

Marcus’s jaw clenched. "You’re lying."

Her head turned just enough for the mask to catch the light. "Am I?"

"Noel’s with them," Marcus said firmly. "All of them. They’ll be here soon. We’re not alone."

For a brief moment, nothing changed.

Then her eyes moved.

They settled on Roberto.

The effect was immediate.

Her posture snapped rigid, like a string pulled too tight. A sharp inhale cut through her controlled calm, and the chains around her body reacted violently—vibrating, drawing taut, some of them rattling as if struck by an unseen force.

Marcus felt a chill run straight down his spine.

The woman took a single step back.

"—No," she whispered, the word barely audible, stripped of its composure.

Marcus turned, confusion spiking. "Roberto?" he said, breath uneven. "What the hell is going on?"

He didn’t understand what had just shifted.

The woman began to tremble.

There was no fury in it, no surge of power spilling outward. It was restrained, almost subtle—but unmistakable. Her shoulders tightened, breath turning shallow behind the mask, chains quivering around her as if responding to something she couldn’t fully suppress.

Fear.

Marcus felt it before he accepted it.

His breathing sped up despite his effort to control it, chest tightening as his thoughts scattered. This wasn’t how things were supposed to go. He searched her posture, her aura, the tension in the air, trying to force logic into place.

Why her? Why now? What the hell did she just see?

Nothing added up.

The woman lowered her head slightly.

She didn’t kneel. She didn’t prostrate herself. But something in her stance gave way, like a structure losing one of its supports. The chains slackened just a fraction, no longer aggressive—hesitant.

When she spoke again, her voice was different.

"...So you’re still walking," she murmured.

Just a statement—one that carried weight far heavier than the words themselves. Something only someone who knew would say.

Marcus swallowed hard.

Each second stretched unnaturally long, his heartbeat pounding so loud it drowned out everything else. His instincts screamed at him to move, to act, to do something—but his body refused to obey.

Roberto was standing exactly where he’d been before.

Looking at them.

Smiling.

Not the familiar, tired smirk Marcus had seen a hundred times after fights. Not relief. Not reassurance.

This smile was wrong.

Twisted at the edges. Empty. Devoid of warmth or recognition. Like something wearing a memory of a human expression without understanding why it existed.

A chill crawled up Marcus’s spine, settling deep in his gut.

Rejection hit him all at once—raw and visceral. Something ancient inside him recoiled, screaming a single, wordless command.

Run.

And in that moment, before anything else happened, Marcus understood one terrifying truth:

Whatever stood beside him now—

—it wasn’t the Roberto he trusted anymore.

Marcus tried to speak.

"Roberto...?"

The name barely left his throat.

FWOSH.

Light tore through him from behind.

It was worse than that—clean, precise, absolute. A lance of condensed radiance punched straight through his back and burst from his chest in a flash of white-gold brilliance.

For half a heartbeat, there was no pain.

Just impact.

Just the sensation of something wrong occupying space where it shouldn’t exist. His breath vanished from his lungs, stolen in an instant, and the world lurched violently forward.

Then the pain arrived.

White-hot. Crushing. All-consuming.

Marcus’s legs gave out beneath him, strength evaporating as blood sprayed across the ruined stone in front of him. He fell forward hard, palms scraping uselessly against the ground as his body refused to respond the way it always had.

No—

This doesn’t—

Roberto—

His thoughts fractured, slipping over one another as his vision blurred. The island tilted, sky and ground swapping places for a dizzying second before settling again, colder this time.

Behind him, there was no struggle.

No hesitation.

Roberto was still standing.

Still smiling.

The light lance hadn’t dissipated yet. It extended from his hand with effortless stability, humming softly as if this were the most natural thing in the world. Like he’d done this before. Like he’d always been capable of it.

Marcus coughed, red spilling from his lips as his body hit the ground fully. His fingers twitched once, uselessly, before slackening against the stone.

Time stretched thin.

Sounds dulled. The wind. The chains. His own heartbeat, slowing, uneven.

He couldn’t turn his head anymore—but he didn’t need to.

He could feel it.

Behind him, Roberto’s presence hadn’t changed. No spike of power. No dramatic release. Just calm certainty.

The woman of chains stood frozen.

Her entire body was locked in place, chains hanging limp and silent, her head still bowed slightly—like a witness who knew better than to interfere.

Marcus’s vision dimmed at the edges.

’So this is it,’ a distant part of him realized. ’This is how—’

The thought never finished.

The last thing he saw—

the last thing burned into his fading awareness—

was the smile behind him.

The smile of the First Pillar.