Demon Lord's Reincarnation

While Reginald and the other nobles were conducting their strategy meeting which was basically them already celebrating their upcoming victory with a party, they heard the announcement made by Arthur. 

"So the fake king sent some people to rattle us. Let's see what kind of army he sent." Reginal scoffed as he and the other nobles took a look outside. 

Outside the gates of the mansion stood twenty men and women wearing subpar equipment, and in front of them was a child that looks no older than ten. He then checked on what level their mana was. He took out the glasses that could see through one's mana. He saw that the twenty had average level mana that most commoners had, but the child was different. The child was emitting mana that was the same level as a high mage. It was surprising but it wasn't that weird since there were some geniuses like the former Grand Mage that had that kind of talent. Still, a child was a child, and no matter how strong his mana was his skills and combat experience wouldn't be able to match his mana supply. When Reginald saw the lineup of not only women but even a child he gritted his teeth in anger. 

'Is that Ren mocking me?! Sending women and children, and even men that have mana so little I could squash them with a finger. He wants me to surrender with that force?' While Reginald was getting enraged, some of the other nobles started laughing. 

"As expected from a commoner, to have weak people serving under him. Still, the child does have potential, but it's a pity he serves a worthless master." 

"Some of those women are actually pretty good looking. Should I take some, no maybe I will take all of them?" 

While the other nobles were waiting for the show that's about to happen, the royal guard commander stood in front of Reginald.

"My lord, what is your command?" 

"I don't care if they're women or children, those filthy commoners that get in my way should all disappear. Just kill them and bring their dead bodies back to the fake king." The royal guard commander simply saluted before leaving. 

Even though the job was not a good one, and he didn't really agree with the order, he was a soldier and he was trained to follow orders. 

...

The knight commander ordered a few of his men to deal with Arthur and his companions. A couple of royal guards surrounded Arthur and the twenty. 

"Are you here to surrender?" Arthur asked, which made the royal guards frown. 

"I'm sorry child, but you should not have come here. Do not blame me for this. I simply hope you reincarnate to a better family next time." 

"So you guys aren't here to surrender, is that correct?" 

"..." Silence was the response of the royal guards as they drew their weapons. Seeing their reaction Arthur signaled the twenty. Everyone watching thought that this would end with Arthur and his group dying without being able to do anything. Yet the opposite happened the twenty men and women standing behind Arthur moved in unison, the moment they drew their swords was the moment the royal guards started dying one by one.

The royal guards who were wearing superior equipment and had used mana barriers were unable to withstand a single manaless sword strike. The commander of the royal guards was shocked by the scene he had witnessed, but he quickly gave out the order to retreat and get into formation.

...

The nobles watching the show through the windows were shocked speechless, some of them wanted to flee, while the others were trying to contact the armies they stationed outside the city. On the other hand, Reginald looked at the scene with wide eyes.

Reginald was not only a Sword Saint but his mana was classified to be as powerful as High Mages. He also studied a ton of spellcraft. So he knew a thing or two about mana flow and he was sure that those twenty had little mana, in fact, some of them barely even have any. The way they moved could not be achieved without the usage of several spells, yet Reginald felt no fluctuation of mana. Not only that but the way the twenty used the sword was unique. 

The sword way the twenty used was not from a known school, in fact, it doesn't look like they know any proper forms at all. Their way of the sword seems to be born from battle. The way they easily sliced through the waves of the royal guard with precision and perfectly timed coordination. Reginald could already guess that the royal guard will be annihilated if they continued. 

"Commander back away now!" Reginald barked an order as he took his sword and jumped down from the third floor of his mansion. The royal guards followed the order and swiftly backed away. The twenty of the Shadow Clan stopped attacking and also retreated back to stand behind Arthur. 

"Who might you be?" Arthur asked. 

"Brat, you dare come here without even knowing who I am? Then listen carefully, I am none other than the great Duke Reginald, the true heir to the throne!" Reginald unleashed the full might of his mana and bloodlust to scare Arthur and the twenty. Yet despite that display Arthur and the twenty were not affected in the slightest. In fact, they were wondering why Reginald was doing that.

Noticing the reactions of Arthur and the others, Reginald was dumbfounded since that wasn't the reaction he was expecting. Where was the fear in their eyes, the awe in their expressions? 

'Why are they looking at me like I'm some kind of idiot?' Reginald was infuriated by Arthur and the other's expression.

"Oh, so that's you. Hmm, I see you do indeed look more powerful than any of the people present here. As expected of a Sword Saint" Arthur nodded his head. Hearing what Arthur said Reginald felt relieved finally a normal reaction. 

"So now brat, do you understand what kind of predicament you are in?" 

"Yes, I do understand the situation. Did you come here to surrender personally?" 

Everyone was dumbfounded by what Arthur said. Reginald almost stumbled when he heard what Arthur said. 'Brat you didn't understand a thing!' Reginald screamed in his mind while gritting his teeth.