Demon Lord's Reincarnation

Kithra decided that she needed to take this risk since the whole situation was falling apart. Without any financial backing, once Ren returns from his trip, he might find that his whole plan failed from the getgo. That guy seems like he would be okay with failure, but one cannot be too sure so Kithra decided that this was for the best, if anything goes wrong the worse that could happen is death, which will happen either way if she fails to implement Ren's plan

...

It took Ren and Silika fourteen days to reach the lands the Resteti family call home. It was very hard to find since their true residence was hidden inside a cave. The first place they went to was the one that most people knew about, but that turned out to be nothing more than a false residence made to trick their enemies.

Ren and Silika started to search for other places they could be hiding in. As they searched for the true residence they were able to hear various rumors about the current Marquis of the Restetis. It seems that in some rural villages like Ren's home, the rumor is that the Marquis was a b*stard that steals wives, but that rumor changes depending on the village or town. 

Now as you approach a village near the fake estate, a different rumor which sounds more realistic was going around. It was said that the Marquis used to act like a timid little boy, but then one day he suddenly changed. The Marquis that used to be kind and understanding suddenly turned fierce. He started to hole up in his residence and do all sorts of experiments. 

One time he went out and challenged all the swordsmen near his residence. He then showed swordsmanship that was like no other. Seeing their once kind lord suddenly show such profound swordsmanship just made the citizens confused. 

Everyone knew that once upon a time the Resteti family were a group of powerful mercenaries, but after the king dealt with them, they lost all of their former glory. Nowadays the strongest of their children are taken away and the weaker ones were the ones who inherit the title of Marquis. That hasn't changed even with the current Marquis' generation, but what happened now, it turns out the current Marquis was a strong swordsman. 

Those were most of the rumors Ren heard throughout his journey in finding the real home of the Marquis. The change in personality and the sudden increase in combat ability was something he had witnessed before. 

'Heh, so he's a transmigrator. Those guys usually use swords as their main weapon, and now that I think about it, I guess they were using Spirit Aura at the time. I always thought transmigrators were weird beings that used a different kind of mana, it turns out it was just Spirit Aura.'

While walking inside the well-lit cave Ren couldn't help but smile as he couldn't help but feel excited at the prospect of fighting a transmigrator. Especially after that disappointing, thing that happened with Nezzard. 

...

After a few more minutes of walking, Ren and Silika finally found what they were looking for. It was an amazing sight to behold even for Ren, a fortress was actually hidden inside a cave. As the two got closer Ren saw, the men who were at the fortress battlement were pointing their arrows at him and Silika. 

"Who are you?" The leader of the archers shouted at Ren. As an answer, Ren simply picked a pebble and threw it at the archer beside the leader which made his head explode. When the leader saw this he was stunned for a second before he suddenly started shouting. 

"FIRE!" A rain of arrows inside a pretty large hollow cave descended upon Ren and Silika. Seeing this just made Ren chuckle as he casually swiped his hand and made the arrows scatter like fallen leaves. 

Attacks that had no mana in them were as threatening as ant bite to Ren. Even when they saw how easily Ren dealt with their rain of arrows, the archers just kept on firing at Ren and Silika. While that was happening the leader of the archers sprinted away to report to the Marquis. 

...

While dealing with the rain of arrows, Ren would casually flick an arrow back to its sender. Slowly but surely the archers were slowly diminishing. It was then the gates of the fortress opened and a platoon of full plated armor men appeared. These men also had the same amount of mana as a normal person, meaning they don't know how to use mana to attack, nor do they know how to infuse mana into their weapons. So all in all they weren't any threat to Ren. 

The full plated armor men started to charge at Ren and Silika, and in response, Ren merely coated himself with a bit of his mana, and Silika did the same. The man then swung their swords at Ren, but to their surprise, Ren's body was not sliced in half. Instead, it was their swords that broke in half. 

The man who was first to charge in was surprised, but then he saw Ren's finger was nearing his forehead and with that Ren poked the man's forehead piercing his helmet and his skull. When Ren was about to kill the other full plater armored men in the same fashion he sensed something coming his way and he evaded. 

An attack that looked like [wind blade] sliced at the ground he was standing on a few seconds ago. Ren seeing that move that was not created with mana but instead, created with Spirit Aura made him smile his familiar vicious smile. 

From beyond the gate, Ren saw a man holding a sword that was around three feet long with a double edge blade. The sword had a mystical green glow to it, it felt like the sword was a part of nature itself. 

The man who was holding this blade was looking at Ren in an arrogant manner. This only confirmed even more that this man was a transmigrator since most of those guys had almost the same temperament.