Here is the English translation of Chapter 79, complete with the second half you added, keeping the atmospheric tone and strictly omitting all hyphens (-) throughout the text:
Chapter 79: Cowardice... Courage?
"AHHHHHHH!"
A girl charging forward to engage Lunas was killed almost instantly, her neck snapped before the gray haired youth's eyes could even track the motion.
Lunas's speed and physical power were utterly terrifying.
"Hah... hah..."
The gray haired youth gasped repeatedly, clutching his head as he watched the battle unfold before him, looking at Corin, looking at everyone.
He stared at the girl whose neck had just been snapped. Her eyes held a deep, complex whirlwind of emotions as life left her, and in his view, that swift transition from anxiety, horror, and fury to defiance, agony, and regret played out like two blurring photographs fading away in a flash.
Dropping to his knees, he buried his face in his hands, calculating his next move.
The gray haired youth assessed every single person. His eyes trembled violently before turning cold and razor sharp. In a split second, he shifted his gaze toward Corin.
'Run.'
Pouring all his remaining strength into his legs, he began creeping backward. Yet he dared not move too fast; speed was meaningless here, so he aimed to remain as silent as humanly possible.
Moreover, he regulated his breathing, his expression bone dry and unnaturally composed, resembling someone trying desperately to act unbothered while playing a horror game.
He let out a long sigh, though his breath quavered as he took painstaking steps backward.
The gray haired youth glanced at the person closest to him, Corin. They had known each other for barely a day, hardly long enough to be called close friends.
Yet at the thought of Corin dying, he instinctively paused, muttering a couple of words under his breath.
"Run..."
As if sensing something amiss, Corin spoke to the gray haired youth standing behind him.
Corin opened his eyes, allowing tears to stream down his face; he was terrified of death, utterly horror struck by its approach.
Yet Corin's response snapped the gray haired youth out of his trance.
"...Run? Where could I possibly run to... You should run, run quickly, do not be afraid..."
Corin trembled as he met the gray haired youth's gaze, yet within his eyes burned an indescribable madness...
It resembled the gaze of heroes about to charge into heavy artillery for the greater good, a bizarre blend of horror, heroism, and unhinged resolve belonging to someone who no longer understood himself.
BOOM!
Corin looked back at the battlefield. No one else had died yet, but one survivor was gravely wounded, mere moments away from becoming a corpse for crows to peck at.
Corin took a deep breath. Looking at this young man he had met just a day ago, his mind instinctively drifted to his two brothers, and then back to himself. A lump formed in his throat, yet that wild, crazed glint in his eyes remained locked on the distance.
"!"
The gray haired youth was suddenly lifted off the ground, pushed far away as the earth beneath him, controlled by Corin, swept him back like a mud wave driving a small pebble.
"Mm..."
The youth clawed at the mud smearing his lips, yet he could do nothing as...
BOOM!
The battle raged on, forcing Corin back into reality. He knew, he truly knew that he would not survive until tomorrow, nor reach a future where he could step through the doors of a university, yet somehow that no longer mattered.
'Among everyone here, he is the best at staying hidden... and that boy needs...'
Corin thought, pursing his lips tightly before biting down hard on his tongue. Adrenaline flooded his system so intensely that he barely registered the blood filling his mouth.
His eyes widened to their absolute limit, his pupils shrinking until two black dots remained surrounded by bloodshot veins.
His breathing grew ragged and fast, a faint white smoke like mist exhaling from his mouth.
Corin glared forward, locking his eyes on the three corpses left behind by Lunas, whose face he had long recognized.
Corin took a step forward, exhaling into the open air as though death itself were chasing close behind.
His death, or perhaps the end of this world, had been written long ago, but what did that even mean?
"Promet!! Everyone!!"
Corin roared, his field of vision gradually drowning in a sea of blood red as his raw magic output nearly consumed his own physical body.
'What on earth is this? Why am I...'
Corin let out a heavy breath, casting a final glance at the others before charging directly at Lunas.
'Do I even truly exist?' Corin wondered. After all, he could no longer feel any pain.
Staring at the imposing figure standing tall like a pillar, that dark silhouette drenched in blood, Lunas offered no words, collapsing forward like a puppet whose strings had been cut.
As for Lunas, he raised his leg, unleashing a spinning roundhouse kick directed straight at Corin's incoming body like a spear.
The essence of an orange is the juice extracted after it is crushed.
The essence of ice is the cooling chill born from its melting state.
The essence of the night sky lies in the stars burning away their material second by second.
One cannot obtain the true essence of anything without destroying the vessel itself. Humans are no different; knowledge, strength, and power must all be wrung out drop by drop by exhausting the body.
Including... Path.
Corin's eyes flashed with a sudden gleam, and his perception of the world gradually inverted...
His vision was slowly enveloped by two black chains crossing in an X shape.
Even his very pupils were bound by those two iron chains.
Lunas, who was mid battle, suddenly halted his hands, standing rooted to the spot, leaving everyone present in utter shock.
Then he turned his head, staring straight at Corin.
And then...
Gurgle!
Corin gritted his teeth, holding back the blood surging from his throat, his face crisscrossed with dense black chain like markings.
BOOM!
The earth shattered as dozens of chains burst from underground, coiling tightly around Lunas.
SWISH!
Lunas accelerated toward Corin, yet his stormy speed was no match for thousands of chains surging from every direction.
Like a rising tide, tens of thousands of chains completely overwhelmed Lunas.
Yet did that mean it was over?
"HURRY UP, KILL HIM!"
Promet roared; this was their final chance.
Three seconds, that was the absolute limit.
Inside that cage of iron chains, Lunas, that absolute madman, was using his bare hands to strike violently.
He hesitated at nothing to break free.
Including... his own life.
Lunas used his tongue to hook around his own tooth, snapping it loose.
Through the narrow gaps between the chains, Lunas and Corin locked eyes.
One gaze was filled with defiance and unwilling regret; the other, pure indifference.
CRACKLE!
The chains anchored to the earth began to fracture, and Corin, straining with every fiber of his being, slowly began to fade.
PLUNGE!
Corin's eye was blown apart, leaving behind a cold, desolate silence amidst the roaring screams that raged like fire.