Demon Lord's Reincarnation

"You really do have talent, if you continue to train then you'll become a top warrior in just a few years. Still, that won't be fun. Following the straight and narrow path isn't really my style, and since you're my disciple I don't want you to follow such a boring path." Ren spoke as he shrugged his shoulders.

"So let's go beyond that path. You see I noticed that there's something deep within you, that you can use as a source of power. On the surface, you might seem like a kid who's calm with pure determination, but hidden deep within you is a beast waiting to come out. A beast that would tear apart his enemies until nothing is left. Knowing your true nature, the technique I'm about to teach you is something I came up with when I first met you. I specifically made this technique just for you, so be grateful." Ren happily explained to his disciple.

"Master, what kind of technique is it?"

"It's a technique that could triple your strength, and use all of your mana in full capacity. Yet in exchange for using such a technique compensation is needed. Once the technique is used you will feel enraged and your mind will dull. This technique will turn you into something wild and ferocious. It will make you start killing everything in sight. You will not stop until everyone in sight is dead or your mana supply depletes. I call it the technique [The Berserkers Will]. It's a technique that only someone with talent and an unending rage will be able to use." Ren noticed that look of worry in Arthur's expression.

"Don't look at me like that. I understand your concerns but as of now, I don't have a way to deal with the drawbacks. Well if you keep on using this technique you might find a way to stop yourself from being overwhelmed with rage. So for now only use it when you're surrounded by enemies and you have no way out."

After teaching Arthur the technique, Ren unleashed him in a B rank dungeon, and within a few days, the whole dungeon collapsed and every monster in the vicinity was killed.

...

Arthur remembered what his master said and looked all around. 'It would seem that now is the right time to use this technique. There's nothing but enemies on all sides.'

Reginald who saw the approaching army was delighted. He quickly shouted and gave a command to the approaching army.

"KILL THE BRAT!"

When the commander of the approaching army heard the command he did not immediately respond since it wasn't from his lord. Still, he noticed that there was something wrong with the child that was releasing a horrifying amount of bloodlust. He no longer hesitated and gave out the command to attack the child.

...

As the Royal Guards surrounded him at the front and the armies of the different lords were coming from behind, Arthur's pupils turned red, it was as if a dam was broken inside of him and his mana started flowing like a raging river. The sudden burst of mana caught everyone by surprise, it was then Arthur roared.

The roar mixed with an intense bloodlust made the weaker nobles fall down and tremble in fear. Some of them even started to cry. Reginald was also somehow frightened as he retreated to the back.

It was then Arthur moved, he appeared before one of the Royal Guards. The Royal Guard was surprised but he still quickly lifted his shield to block, yet despite doing that Arthur punched the shield and knocked the royal guard away shield and all.

Arthur then jumped upward and slammed down in the middle of the army from behind. Arthur landed on the body of one of the vanguards which exploded making his innards splatter. Arthur then began killing everything within his arms reach. The speed and ferocity of his attacks unnerved some of the soldiers.

Unable to unleash a barrage of spells since Arthur was too close to their comrades the army was forced to handle Arthur in close quarters. This choice proved to be a mistake, as Arthur decimated everything in sight.

Arthur used his hands to tear their flesh, he used his teeth to take chunks of their bodies. His fighting style was so brutal that it made those watching puke. The others wanted to flee but their legs weren't moving.

The battlefield was now littered with dead bodies. There were bodies that looked horrible and one could only describe them as meat paste. There were some that had their ears and fingers bitten off, and some that had their very skin torn from their body. It was a horrifying sight to behold.

Reginald who was watching from behind could not help himself as he started shivering in fear. When he noticed what he was doing it only made him even more enraged. 'How could I a great and powerful noble fear such a savage beast?! Damn this! Damn it all! I won't allow such a beast to make me feel fear!'

"WHAT ARE YOU PEOPLE DOING?! GO, GO, AND KILL THAT MONSTER!" Reginald screamed at the top of his lungs. That was when the berserk Arthur looked at him. When those red pupils stared directly at him, all the courage, all the dignity Reginald had as a Sword Saint dispersed. Still, with his high pride, Reginald would not admit to it, and he glared back at the beast. He would not cower, he would not back down.

Arthur shifted his attention to Reginald and dashed towards him. Reginald who had his body healed a bit, tightly gripped at his sword. Yet before Arthur could reach a lot of Royal Guards blocked his path.

The current commander of the Royal Guard approached Reginald and spoke to him. "My lord you and the other nobles need to retreat from here."

"Are you telling me and the other nobles to flee from this beast!?" Reginald gritted his teeth as he spoke each word. The commander hearing the death screams of his soldiers clenched his fist.

"My lord, you are the only remaining person from the royal family. If you were to die then it is the end of the royal line of the Serbek Kingdom. You have a noble mission, my lord, to remove the fake king from the throne. So please leave this place and come back to-" The Royal Guard Commander wasn't able to finish what he was saying as he felt Arthur's approaching presence. Without any hesitation, the commander pushed Reginald to the side. The Royal Guard Commander then saw a hand had pierced right through his armor and chest. The commander grabbed the arm tightly.

"My lord leave now!" The commander shouted as Arthur tried to remove his arm from the commander's chest but could not. Arthur then started pounding at the commander with his free arm and swung him at the nearby Royal Guards.

"I'm not going to let go you monster!" The commander of the Royal Guard shouted, but it was then he felt Arthur's hand holding his head. Arthur then detached the head of the commander from his body. A burst of mana coming from Arthur destroyed the commander's body until only ashes remain.

Arthur once again roared, his body painted with the blood of his enemies. No one who saw him could see a human child, all they saw was the monster of Destruction.