Living Weapons!
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The link is also in the synopsis
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"We can't have them right away?" The two excited brothers suddenly had disappointed looks on their faces. They even felt that their dear teacher was messing with them and playing around with their feelings by showing them these two great swords but not giving them right away...
However, Bakorio's intentions were far beyond what they were expecting as he said "The sun sword can naturally absorb the energy from the sun and use it to increase the power of all fire-based techniques. As for the moon sword, it can do the same with the energy from the moon and you will be able to use it to increase the power of all water-related Jutsu. The two of them also have a unique technique that can be unleashed called Sun slash and Moon slash, I will leave it for you to discover their powers later"
Hearing Bakorio's explanation, the faces of both Sogetsu and Kazuki lit up once more, but Kazuki's face soon dimmed and he asked angrily "Teacher, these swords are already so amazing, why can't you give them to us right away? Please give me a proper answer!"
Bakorio could see that fire was about to erupt from Kazuki's eyes if he keeps dragging this matter so he smiled slightly and said "You two have two troublesome entities inside of you that keep refusing to help you with the power they have, and I'm planning to bind them to these swords so that you can use their power in the future much more effectively"
Hearing this, Kazuki's and Sogetsu's eyes widened in surprise… Throughout the years, they tried everything they can to convince the two demons Suija and Enja to allow them to use their power so that they enter a state similar to a Jinchuriki where the two sides synchronize their power to create a stronger form of the two.
However, the two demons' pride stopped them from growing closer to the two kids, in fact, they kept using every possible opportunity to tempt the kids of getting them out of their seals, especially when they are desperate and needed their help out of a dangerous situation.
But Kazuki and Sogetsu weren't idiots, and they never allowed the temptation of becoming stronger get to them no matter how matter they desired this power, so hearing that their teacher found a way for them to use it, how can they not be both happy and surprised by such news?
Meanwhile, the two demons were feeling the complete opposite as unease started growing in their hearts, but there was no turning back anymore…
"Teacher are you serious?" Sogetsu asked curiously and seeing that Bakorio was clearly not messing around with them, he started feeling excited and he couldn't help but shoot a look at his brother and Kazuki did the same…. They can still grow much stronger!
"My mastery in seals has increased and I found a way to perfect my living seals creation…. Now I can make living weapons, the quality of the weapon, seals, and the soul imbued in them must all be carefully chosen, but I believe It will be successful" Bakorio explained calmly.
The two swords were some of the spoils that dropped from the beast he's constantly hunting, and over the years, his primordial seal mastery kept increasing until it reached level 15, and he received a reward for it reaching level 10 as usual.
[Quest Primordial Seals 1: Reach level 10 in your Primordial Seals mastery. Reward: 30000 points, Weapon enchanting Manual]
From this Weapon enchanting manual, he learned how to enhance the powers of weapons by imbuing them with seals, and it also strengthened his knowledge regarding living seals which is why he was confident in enchanting the two swords!
"When are you going to start?" Sogetsu asked curiously and Bakorio simply smirked at him and said "Now of course"
"Enja is screaming like crazy, he wants to talk to you" Kazuki suddenly said after feeling the demon inside him going berserk and Sogetsu was feeling the same but he simply ignored Suija and didn't even feel that voicing his worries was worth it after he declined from helping against Akami and Mimibe! As calm as he always appears, he was also vengeful to the bones!
"It doesn't matter, the time for talking is long past us, who wants to start first?" Bakorio calmly said and surprisingly both brothers raised their hands at the same time…
'They are both willing to take the risk for the other huh? it's good to see their relationship's going well despite them fighting all the time' Bakorio thought with a slight smile on his face before he said
"Let's start with Suija, he's much more troublesome and I'd rather deal with him quickly first" After saying this, Bakorio picked up the moon sword and slowly unsheathed it showing its crystal clear surface and extremely sharp edge! but both Kazuki and Sogetsu noticed that it had many symbols engraved on it. However, Bakorio's next action made them freeze, he aimed the sword at Sogetsu's stomach and said "Don't move no matter what"
"T-Teacher, what are you doing?" Kazuki asked hesitantly but Sogetsu calmly shook his head and said "Just trust in teacher" Before he nodded at Bakorio with a calm look on his face.
"Good kid" Bakorio said with a slight smile before mercilessly stabbing him in the stomach to the shock of Kazuki who couldn't help but yell in distress "BROTHER!" However, when he was about to take out the sword, he noticed that no blood was leaking from the wound. Instead, a dark substance was slowly traveling through the edge of the sword and an eerie yell was echoing from it
"Bakorio you damned devil, How can your mastery of souls and demonic energy be this strong! You can't be human! YOU CAN'T BE!" This was of course Suija who was yelling, and the two brothers felt shocked by his words as they understood that they hid a deeper meaning…
'Teacher can control demonic energy? I guess it's necessary to make sure that Suija's gift is imbued in the sword, but when did he gain such mastery? Even the two of us can't control demon energy that well despite our origins…' Sogetsu was truly confused, and so was Kazuki, but they simply watched silently.
The demonic energy extracted from Sogetsu was immense, in fact, it was comparable to Kurama's chakra if not more! That's just how strong this ancient demon is, but now it was all seeping in the symbols engraved into the blade, and not long after, its crystal-clear surface started releasing a chilly aura around it signifying that the operation was successful!
Then, Bakorio calmly took the sword out of Sogetsu and quickly healed his wound before he said "Here you go, Let's call this sword Peaceful Moon from now on… Although I'm sure it will be anything but peaceful in your hands"
Sogetsu nodded slightly to his teacher before he bowed deeply… Just by holding the sword, he understood that he's grown much much stronger, but more importantly, he can feel that he could also use the gift of this demon through this sword "Thank you teacher… This favor, I don't know how I can repay it…"
"What favor, this is a gift, what a stupid brat" Bakorio simply shook his head at Sogetsu but it brought a smile to the latter's face.
Meanwhile, sensing the strong aura coming from his brother's body when he held his sword, Kazuki quickly said "My turn My turn!"
"Sure…" Bakorio replied with a smile before he started doing the same thing to Kazuki and enjoying the angry cries of Enja… It was like music to his ears…