Chapter 15: The end of Red Dragon
Over the years, countless societies have raised the notions of something called elements. Alchemists in Greece, Egypt, India, the Islamic world, Asia, Europe, and more. Their methods sometimes differed in a big or small way, but they all arrived at the same conclusion eventually that the universe is made up of an esoteric concept connected to the elements such as fire, water, etc.
Tsuna who had never been engrossed in those more obscure sides of History as they weren't taught, just barely passed over in school, wouldn't have known about this without looking for it on his own.
Now, why would that even matter? Because he realized that his energy is still an elemental one, just that... it wasn't the same thing as chakra.
First of all, this energy inside him wasn't supposed to be there all the time, it was his misconceptions and the way he treated it that allowed something like this to happen.
This was why he couldn't feel nor see Reborn's chakra before because that wasn't how he used it, he only summoned his strength when it was due.
Although he can't say for sure, through his private studies, he came to the conclusion that this world's energy won't allow him to perform things that stray from either the characteristics or the element of the flame.
With his flames, fire jutsus are easily performable, for ninjutsu seals are simply a method of shaping energy in the desired way and something that he didn't know if others were capable of.
Other than those kinds of jutsus, he discovered that those fundamental jutsus that don't rely on nature transformation mostly worked, things like body flicker, transformation, chakra threads, and so on.
Overall, this energy he first considered to be the same Chakra from his world had many limits as well as capabilities that escaped his scope of reality. First of all, if this energy usually shouldn't reside inside of him all the time, where could it be at the moments he wasn't using it?
His first guess was that it was somehow inside the soul. He knew that the spirit existed here one way or another because his System had already proven its existence.
But he couldn't tell how it affected or interacted with the body.
The curious thing though is that he wasn't sure how Yin and Yang behaved in this world. He had a feeling that those were also part of the elements that a flame could have, and if that was the case, just like in his previous world, this one had 7 nature transformations at least in terms of the individual characteristics of a flame.
For now, he could tell that his flame probably had 2 characteristics, the first is that it was indeed fire, and the second was something that he couldn't possibly comprehend right now. He would either have to study it himself or ask Reborn.
But even with those things he discovered, he decided to not stop using 'Energy' the way he had been doing before, his rate of improvement was outstanding and he believed that by making it run through his vessels pathway system the 'Energy' was refining every corner of his body.
[Physical level: Elite Jonin]
[Chakra level: Elite Jonin]
A month. In this period of time, he successfully reached the same level of power that he had before coming over to this world. However...
Tsuna pushed away his sword from the head that he had split with a single cut and narrowed his eyes as the members of the Red Dragon in front of him raised their iron bats and pipes in a threatening way. "How to overcome my limits..."
Even now that he had found the hideout of the Red Dragon, he didn't feel like paying attention to them, he was, after all, locked in a dilemma, how could he go further and attain the level of a Kage, or the level of someone like Reborn?
"Fuck you, Demon! Do you think the Red Dragon is something you can mess with? Do you want to die that badly!?" Someone cried in anger as he looked to his former comrade whose soul was, hopefully, being tortured in hell.
Tsuna frowned hearing this voice and licked his lips without minding the blood of his enemies that had covered half of his face and suit.
"If there's something I hate the most, are dogs that bark and don't bite, if you won't make a move, I shall do it in your place." Tsuna was angered, no matter how much money he was making recently thanks to those fools, he had been unable to think of a way to continue growing strong! The frustration seemed to have trigger something within him and his eyes started to change.
Under the watchful eyes of Red Dragon members, Tsuna's iris became red and three black tomoe had appeared surrounding his pupils.
At that moment a boy about eighteen years old stepped forward and stood in front of the others. "Bastard! How dare you mess around inside Japanese borders!"
Hm? Tsuna's curiosity was picked by this statement, what made him say something like that? "Did you have an aneurysm or something? What the fuck are you talking about?"
"Puft!" He spat on the ground and took a handgun that he had been hiding on his back. "Humph! I thought trash like you was behind bars, I don't know how you escaped, but this is Yakuza territory!"
"Dragon-senpai!" The people from the Red Dragon looked at the boy whose face was covered by a mask of a red demon with shining eyes.
"Is that so?" Tsuna nodded slightly, he got some interesting info today, he was only going to kill them all, but now? It seems that something about him was recognized by that guy, and he wanted to know what, and why. "Gokudera, let this Dragon for me."
Huh? The people from Red Dragon frowned, did he had backup somewhere?
Before they could react a rain of dynamites appeared above them, and explosions resounded within the old warehouse.
Dragon was surprisingly unscathed by the explosion, and this made Tsuna frown, it wasn't like Gokudera avoided hurting him, he just used less force as to not kill him, and yet.
"Humph! It will take more than that to deal with me." Dragon aimed at Tsuna and pushed the trigger.
Tsuna who was about to use his sword to cut through the bullet frowned as he felt a dangerous feeling and jumped to the side.
At that moment a beam of pure dark red energy hit the wall and created a big hole the size of a truck on it.
Fast! Way too fast!
A single motion was all it took and this Dragon shot something with the power of a B-rank Ninjutsu!
"Juudaime!" Gokudera cried in fear, revealing his position to Dragon accidentally.
"Gokudera, run!" Tsuna was about to cast body flicker, but Dragon was still a step ahead. Only after he had pulled the trigger that he arrived in front of him.
An explosion resounded together with the painful cry of Gokudera falling from the upper floors in a pile of debris.
'Fuck!' Tsuna's face contorted in anger, he waved his sword and struck at the man, but before his sword could hit his body, it was deflected by a flash of reddish-orange light!
At the same moment, through his eyes, he saw flames covering the man in front of him, and with it, his confusion grew!
'What the hell is this!?' It was similar and yet different from the 'Energy' he had been using and witnessed Reborn using before. It lacked the double characteristics, but it acted much more similar to flames than the one he had.
Dragon smirked. "Do you think only you guys from Italy have an ancient inheritance!? Be honored for dying to my Hijutsu! Corrupted Hell Flames!"
Tsuna smirked as he saw the man's fist covered in real flames, although he could easily avoid getting struck here, he couldn't help but gulp as he felt something in his eyes after seeing those flames... 'These flames... they feel... familiar...'
He stepped to the side and spun delivering a powerful kick enhanced with chakra that threw Dragon back by almost five meters.
The flames of his punch ended up hitting the ground where he previously was, he was about to ignore it, but...
"What...?" Tsuna's eyes locked on the flames that were burning the metal floor... "This... why it's still burning?
"Hah! Those flames aren't like the trash that most Hijutsu users trained in... hehe!" Dragon licked the blood falling from his lips, he couldn't attack and defend at the same time so the blow managed to reach him. "The Corrupted Hell Flames had another name in the past, Amaterasu's Wrath, flames that never die! Hahaha!"
Tsuna frowned hearing this, he held his katana with both hands and prepared to attack. However, his pupils contracted as he felt energy gathering around the man.
"I'll fucking kill you! Haaaaa!" Dragon aimed his handgun glowing red at him and shot.
At that moment Tsuna's body flickered and in an instant, he appeared behind Dragon, however, since Dragon couldn't see it, he waited and watched what this technique of his would do, and to his surprise, this continuous beam of energy was much stronger, it broke through the warehouse and left a trail of destruction on the ground about one meter wide and it continued for almost a hundred meters.
If it was Jutsu, it would be a fairly powerful A-rank one...
He had to admit that this Dragon was talented, however, talent is worth shit if you can't use it properly.
With a single movement, he cut Dragon's right arm that was holding the gun. Before he could even cry in pain, Tsuna's chakra flared like flames enticed by fuel, and in less than a second he cut two more times with stunning speed. Removing his other arm, and the last slash cutting away both of his legs with a single motion.
The limbless Dragon fell on the ground with bloodshot eyes, blood was dripping from his lips and limbs, as he held in the feeling of crying in pain and shot a murderous look towards Tsuna who just smirked at him.
"Be proud, at least you are a dog that dares to bite, unlike that trash that worked under you. Also, don't worry. I'm not a bad person, I won't let you die, we will have a lot of fun very soon." Tsuna smiled as he patted Dragon's shoulder making him shudder in pain as fear crept deep into his eyes.
'This feeling!' When Tsuna tapped him, he felt some sort of energy seeping into his body, and soon after he felt the pain subsiding and the blood stopped gushing out of his limbs! Looking at Tsuna he couldn't help but cry silently, to think that the one messing with them was actually a bigshot! That cold smile coupled with his words started to torment Dragon, he just wanted to die quickly now...
As Tsuna walked towards Gokudera he looked at his hands and took a deep breath, his 'Energy' could clearly be used to heal injuries through medical ninjutsu, but... Why? Is it something about the shape, or something about the characteristic of his flame? If anything, Reborn's energy should naturally be able to heal people, that vigor and vital energy in it was something that he would never forget.
Arriving at Gokudera's side, he was relieved seeing that he only had a mild concussion, overall he just lost consciousness because of the shock and the impact. Tsuna touched the side of Gokudera's head and after a few seconds of using healing ninjutsu, Gokudera woke up.
"Juudaime... Dragon had..."
"Don't worry, it's over now, come... we have to ask him a few questions."
Gokudera nodded, but the moment he looked at Tsuna's eyes, his heart skipped a beat. "Juudaime, y-your e-eyes...!"
Tsuna who was too distracted by everything that happened today was brought back to Earth and felt like slapping himself. 'Fuck! I forgot to deactivate it!'
CREATORS' THOUGHTS 
Daoist_C_Dreams
Daoist_C_Dreams Used here in a similar fashion to the box weapons, the Japanese underworld also has their own way of using the Dying Will Flames, with theirs being akin to a form of magic.
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I'll be expanding this slowly as the story progresses, for now, I have revealed that they can cast shields when not attacking and that their attacks can take different forms, like coating their arms or enhancing their weapons.
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