I regressed and became the Sword Ice King

There was a deep tremble to the ground as the demon forced its way out of it in a frantic rage. Its arm and torso pulled out, but its legs were still stuck as it struggled to set free. Its cries sent a shiver down the spines of those who stood to watch the sight. The people only panicked more at the sight, but that was the least of their worries.

Tiny demon creatures with bat wings, pig's bodies, and lion's heads surged out from the hole, their chirps of madness vibrating within the Arena as they flew into the Audience section, terrorizing the lives of the people who were left alive while feeding on the dead human bodies.

Their numbers were so large that they cast a dark shadow over the Arena, blocking the ambient rays of the sun from reaching the Colosseum, as crimson blood stained the walls. Their cries had diffused into the air and had spread throughout the Harbour Town, instilling fear within their hearts.

Michaelo's sword appeared, and he swung it across the air, causing a clean arch to follow. A radiant dark and blue glow was projected into the air, and sliced through it, causing a crack that spread vividly throughout the Patriarchs' stands.

"Take care of the Devo babies," he instructed his family as the crack spread wide and smashed into the fabric of space and time, destroying whatever bound them to their spots. "Yes, sir," they chorused as they charged towards the Audience section, their weapons ready, as they attacked the 1st-tier great demons known as the Devo Babies.

The rest of the Families did not hesitate to act the moment the invincible dome was broken by Michaelo, charging into the fray to annul the actions of the demons. Michaelo had diverted his attention to something else - the demon that contained nearly half of the Arena, the 7th-tier demon, Great Jackal.

He sighed, ready to slice through space yet again to get to his son, but something peculiar caught the corner of his eyes. His gaze locked on Raph, who was staring straight at him, unbothered by the situation in front of him.

Michaelo found this amusing, as much as he wanted to worry for his son, he almost made it seem like there was absolutely no need for such. Raph smiled.
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"You know there is someone responsible for this, father; take care of that with the other Patriarchs." He said with an even tone, devoid of any emotions. Michaelo could tell that his son, for starters, was not being controlled to say that at the moment. Michaelo was already aware, and he was sure the other Patriarchs would try and locate the villains, but he had prioritized his son first.

A 7th-tier demon was the strongest amongst their peers and rivaled devils of the 2nd and 3rd tier. This one, especially, the Great Jackal, was a beast that terrorized even Masters. How could his son be so confident? But nonetheless, he decided to trust his decision. With a nod, he turned away and headed towards the Stands, killing the Devo Babies that came his way.

Raph watched this event play out, an aura of coldness wrapped around his gaze. "This never occurred in my past life... was something like this even possible?" He muttered under his breath, confused with the rest of them at the situation that had occurred.

Somehow, a demon had made its way to the Arena, but that could only be the result of a demonic human infiltrating the Colosseum during the Tournament. Well, it was unfortunate that it occurred, but a major event like this would have made it into the history books.

He would have prevented such a tragedy that took place in his presence, but his mind was twirling with reasons why the demonic people would attack now.

'Was it me?' His thought had concluded to that single notion. All he had done so far was to grasp a future where he was stronger than the last, and his family was safe. Was that too much to ask for? The event with Gonzalo Jean and now, demonic humans. Things were escalating rather quickly.

The beastial cry of the Great Jackal shook him out of his thoughts, as its legs broke through the ground in a swift motion. At the same time, the jackal stretched its reddish, naked body forward, widening its mouth as it attempted to bite through Raph.

"What a pity." His voice was like the hollow call of a snowstorm, as a slice sound echoed, and the Jackal's mouth was slit into two parts that began to regenerate nearly instantaneously. Raph appeared at the other end of the Stadium, Jang's unconscious body on his shoulder.

"If it's just a demon..." He dropped Jang's body and held out his sword, pointing it towards the demon. The demon snarled viciously, charging at a speed too fast compared to its huge size, its limbs crashing into the ice, but Raph remained unperturbed.

"...then it's nothing to me." Raph was a member of the Demon Extermination Squad in his past life. Everything he needed to know about them was etched into his brain through theory and practice. Day after day on the battlefield, he would come across them, kill them masterfully. The Great Jackal was merely a 7th-tier to him, no matter how powerful it may seem to others.

A veteran on the battlefield filled with demons, day and night, will always be a veteran.

His legs caused a crater as his speed blew him forward towards the demon at the speed of sound. His aura stars, and mana circles vibrated and twirled with so much speed and precision that his body was literally oozing with power. The jackal roared, widening its mouth as it stretched its head towards Raph.

The boy parried the demon's head to the left with his sword and effortlessly maneuvered himself to the right. He stabbed his sword into the body of the demon, pulling it as he ran to the end of it in a swift motion, leaving a trail of ice on the demon's open wound. It stopped the wound from bleeding but most importantly, it stopped it from regenerating.

'The best way to kill a Great Jackal would always be….'

He slid down the icy ground of the Arena, slicing his sword through the air, causing arcs of energy to emit out of his sword and slash through the demon, freezing as the demon cried in pain.

Its tail suddenly whipped through the air and smashed into the ground as Raph jumped out of the way. Demons were the same, no matter how strong they were. They were always dumb and followed their instincts.

He backflipped in the air and landed at the other side of the Jackal, sliding underneath the shadow of the Demon as soon as he landed.

The Great Jackal turned its head to find him but nothing was in its sight. It's eyes burned red in rage as it raised its claw, smashing it through the ground. It cried again, its roars sending a vibration through the walls of the Arena, but it still couldn't find the human.

A slice sound echoed, and the jackal suddenly fell forward to its left, confusion etched on its body as it attempted to get back up only to fail. His eyes marked a movement that occurred below him, noticing a human who slid through the ground and sliced through the tendon of its right hind leg.

The jackal cried out, falling over its own weight, and its head smashed into the ground. Raph slid out from underneath just before it crashed and jumped over to the top of the demon. His sword glowed brightly, using the demon's body to propel itself into the air.

The rays of the sun bathed his image in the sight of the Jackal as Raph's sword was coated in an aura that increased in size and length, half the size of the Jackal. '...the head'. His body spun in the air as he swung his blade along with it, causing a crescent arc to follow in its wake.

"Chapter 3 of the Jun Swordsmanship: Fierce Surge". The aura erupted like an exhaust pump as it slammed against the demon's neck, causing Raph to halt in the air.

The Jackal cried out, attempting to stand once again, but its legs had been cut off, rendering it imbalanced. Raph bit the tip of his lip as he gripped the hilt of his sword tightly. "Absolute Zero". A cold aura emanated through the blade aura, and a light blue smoke emitted out, followed by the crackling of building ice.

The ice spread through the side of the Jackal's neck and froze it into crystalline ice. The Jackal yelped and gasped, attempting to suck in air, but its neck was long gone by now.

All that was left would be...

Raph, with a grunt, sliced through the ice with ease and cut off the neck of the Great Jackal in a single motion, causing ice and blood to spill out like a fountain.

"Demons are nothing to me".