Cursed Energy!

"So all we had to do to get here was touch that q-shaped dagger?! And what was its name, by the way...?" "The Inverted Spear of Heaven." "...Now that's what I call exaggeration. It isn't even a spear." Miyuki was back, back where he first met Sukuna... except now there were tens of thousands of mysterious creatures floating about, many of whom were gazing at him with curiosity.

"You can see these guys, huh?" Standing behind the redhead, Sukuna wondered aloud. "Its not a big deal, is it?" The pinkhead then whacked him in the head. "It is. These creatures, you see... even me, we're all curses. It'd take decades for somebody to even notice us, and you did exactly that after just one visit to this place. Not only that, against that desert raccoon... you managed to summon me... the strongest curse."

"Given who you are, boy..." Sukuna whispered under his breath. "How ironic... that you're a curse." Miyuki mumbled, only to be met with a glare from Sukuna. "...Okay. So, how did you all come to be? You couldn't have all popped up from nowhere, right?" The pinkhead nodded. "Well, not exactly. We, the curses, are born of the negative feelings that pervade all living things. We also use the above said negative feelings as a fuel source for our techniques."

Miyuki was drawn to a particular detail. "...So, if I'm going to learn this region's sage mode, I can use those negative feelings too! Wouldn't that mean I'd have an endless supply of energy?!" Sukuna could only chuckle at the redhead's glee. "Yes, to an extent. Sage mode users from other regions must combine "natural energy" with their own chakra to form senjutsu chakra. But we, of the Cursed Domain..."

"We don't mingle with natural energy. But we do mingle with negative feelings, which we call "Cursed Energy." A power source similar to chakra. If there was no end to the negative feelings that everyone generates, then you must have an infinite supply of energy, an infinite supply of cursed energy, correct? But, in order to use all of that as your own fuel, you need to have control over it..."

"...At the atomic level." Miyuki arched his brows. "Seriously...?! Atomic level?!" Sukuna nodded once before grinning. "But don't be concerned. With the technique you'll learn, you'll be able to do so quite swiftly." The redhead tilted his head in utter confusion. "...What technique?" "A technique you were fated to seek out and master... and you're probably thinking to yourself, "fated?!"" Sukuna chuckled. "...Those answers will come to you eventually, brat..."

"And now for the big reveal..." Sukuna took a look around and grabbed a curse by the head. "You, old guy. Create a dramatic atmosphere." An old man with several piercings on his face was the curse in question. "Now." Sukuna edged in on the curse's face; it looked terrified. "I-I-I... I'm but an old man-" The curse was trembling, yet Sukuna, ever the tough pinkhead, wasn't one to give up. He glared even more intently at the elderly curse with the guitar.

...And so here we are! With his arms outstretched, Sukuna proceeds to unveil his "big reveal," the technique I'm "fated" to master. On his guitar, the old dude was playing a dramatic piece... terrified. But, what did Sukuna mean by that...? Fated...? Meh. I'll figure it out eventually, just like he said. "The technique you'll learn is known as...!" While Sukuna was bubbling with unusual enthusiasm, I was in a state of stoicism. I wasn't hoping much.

"...Limitless!" "I'm quitting, that name's exaggerated." I shook my head and got up to leave. "Hey, wait!" Sukuna yelled. What does he want now...? I sighed, turning around. "Wha-" "You're going the wrong way; the exit is behind this shrine." H-Huh...? T-This asshole! What shrine?! There was no longer any shrine behind him! I pointed at him. "If you don't change that name, I will... I... I..." "Yup, yup, go on. I'm paying attention." Damn it. I had nowhere to go!

...And so here we are, again! Surprisingly, my butt didn't get wet while I sat on the ground. I honestly believed it was water... I then raised my eyes to Sukuna-sensei... he wanted to be called as such. Bastard. "All right, student Miyuki-kun, before we start your Limitless training, we need you to master cursed energy first! For simplicity's sake, let's term these so-called techniques "Cursed Techniques."

"... So, so...! Oh, yeah! The sage mode users of this region are called "Jujutsu Sorcerers." For simplicity's sake, again, include that too. We'll be repeating words like these all the time!" I gave him a blank look, as if to say, "Can we start now...?" "...Right! All cursed techniques are built on the skill of a jujutsu sorcerer to control their cursed energy and use it to execute particular functions." I gave a nod. "Control over cursed energy requires innate skill and vigorous training." "Vigorous," he emphasised.

"Jujutsu sorcerers, essentially, are vessels for cursed energy. That is to say, temporary vessels. Jujutsu sorcerers must unlock cursed energy to act as vessels. Not within themselves, like shinobi can with chakra, but only to act as a channel. Cursed energy, similar to natural energy, is everywhere, and jujutsu sorcerers, while serving as vessels... a channel, use it to execute cursed techniques." ...If that wasn't the case, my entire idea of unlimited cursed energy would just be meaningless.

"Curses don't have to do that in the sense that they don't have to serve as vessels for the stuff they're formed of. I, for one, have to." "But why?" "I'll let you know... later." I grumbled, I didn't like being kept in the dark. "Its crucial to be able to control one's cursed energy flow. This ensures that the jujutsu sorcerers do not waste their power supply by being sloppy; though, for a shinobi like you, this should not be an issue. That is, if you even know how to properly flow chakra." I was puzzled. "Of course, I know! I was in the Anbu-!" "Shush!" Sukuna cut me off. "...To begin, you must first unlock your cursed energy."

"...All humans, in fact, all life forms, contain cursed energy within them, but they must first unlock it in order to sense, flow, and use it. And only here, in the Cursed Domain, can you achieve that." So I sat in a yogic pose, in the same way I was taught to unlock chakra. Its just the power source switching... I closed my eyes as I thought this. I started with my stomach, reasoning that as chakra is unlocked from there, cursed energy would be as well. "You're pretty fast..." Right when I heard Sukuna's voice, from top to toe, I was immersed in a crimson glow with black outlines. It was a cold... no... a warm sensation...

...Or maybe both? I opened my eyes ready to see my sensei... but instead found him as a kid?!? How did he become a... a chibi?! It wasn't even the Transformation Jutsu that he was doing! "Don't gawk at me, you pervert; I've just changed my form." ...I inhaled deeply and sighed. Let's just not ask any questions about this Sukuna fella, okay? O-Okay. He disturbs even my alter ego... fuck! I'm starting to sound like him now!

"We're going to spar. I observed you are doing something incorrectly, and the only way I can solve it is to spar." He said... my god! Even his voice changed! "But why don't you just say so...? And why change your form when you could easily spar in your original...?" "Its the law. Besides, it wouldn't feel right for me, a 190 cm man, to fight you, a 156 cm kid. So, brace thyself, kid. Unless you like being beat... yuck!" He had a vomiting fit... I-I'm not a M! I'm not!

"I'm not a masochist, you idiot! Fine, come at me!" I immediately rose to my feet and took a stance. Sukuna took a step forward, his hands in his pockets. "First. I believe you know how to use chakra to augment yourself; do that with cursed energy." Standing there in front of me, Sukuna said. So, all I have to do now is use cursed energy to augment my parts of the body... Breezy.

We shinobi, by learning to create and wield chakra, continually develop our chakra pathways as they increase the quality and quantity of the chakra flowing through our bodies. At the same time, we are unconsciously enhancing our bodies with chakra to make them physically superior to the average human being in practically every respect.

Even young shinobi have abilities that rival those of mature men, allowing them to leap over tall obstacles, run over treetops, and mount structures with ease. The next level of chakra augmentation is to then consciously focus chakra in different parts of the body, which vitalises the muscles to make them stronger and tougher.

Focusing chakra into our legs and feet lets us run faster or jump higher, and focusing it into our arms and hands lets them endure greater force or hit harder. Most of us shinobi reach this stage once we start learning techniques like tree climbing and water walking, as it gives us more awareness and control over our internal chakra flow, even boosting our basic physical abilities from mastering these exercises.

At first, it takes concentration to send chakra to the right location, often aided by a hand-seal, but it becomes instinctive with practise until we shinobi constantly use chakra augmentation in combat to some degree. As a complete noob, I'd have to rely on a hand-seal to augment myself with this weird foreign source of energy, cursed energy. I'd also need to improve my control of it, which then would amp up the augmentation's effects.

"Let's get this done!"