Jujutsu Origin: Harvest Moon

Sometime around 10,000 BC.

A rugged and barbaric-looking man huddled underneath a large tree's branches, avoiding the downpouring rain around him. He had lean muscles and occasional scars that covered his exposed body, while the rest of his body was covered in a variety of bear furs and animal pelts.

This man was an anomaly. 

He was alone.

It was not natural for a human to be alone at this time. Only criminals and exiles of the tribe were alone.

And this man, he was an exile.

The man listened to the calming sounds of the rain around him, leaning his back up against the tree before closing his eyes softly.

For as long as this man could remember, he had been treated terribly. He had been treated as an evil cursed child since the moment they knew he could see those things.

Curses.

Small and sometimes insignificant things, would sit around the people of the tribe, usually feeding off the 'bad' people.

Of course, this man hadn't come up with the name 'Curses' for them out of nowhere. He had memories, or at least part of them, from a life before this. In this past life, he remembered seeing similar things to this in a show he had watched. Funnily enough, it was one of the few things he could remember from that life.

So he concluded... that he was what would later be called a 'Sorcerer'. A human who could wield cursed energy and see cursed spirits.

How did he know he was a 'sorcerer' and merely a human who could see curses?

Because the moment he turned 4 he awakened his cursed energy and the details of his cursed technique poured into his mind.

Yes, he had a cursed technique. 

In this era of early humanity and low cursed energy, he had a cursed technique.

[Dream Merge]

His cursed technique lets him enter other people's dreams.

This wasn't done mentally.

His body physically entered their dreams.

Since he discovered this, he had entered the dreams of those in his tribe each time he could.

Time in dreams never passed the same as in the real world. 

Sometimes he could remain in the dreams of others for months, while only the usual 6 hours passed in the real world.

For 12 years, he experimented with his cursed technique on his tribesman.

Keeping things relatively harmless, causing the tribe's people only occasional nightmares.

Nightmares tended to be very good for his growth.

He learned that his technique could feedback on the negative energy produced by people when they were dreaming and slowly increase his cursed energy pool.

It was slow, but over the years it had finally grown to about 20 times the previous size.

Sadly, the tribe kicked him out after too many nightmares among the members. People are superstitious in these times, and a man who appears in everyone's dreams and nightmares tends to be noticed after a while. 

His cursed energy had reached a significantly higher level, compared to the low-grade curses he usually saw. Perhaps 20 times the amount of grade 4 in the show.

But even that, probably isn't much compared to the later generations of sorcerers that appeared and were seen in the future.

There just weren't enough humans or sorcerers at this point to generate anyone as strong as a special grade.

But for now, he was practically invincible in his current era.

His technique was good, being able to siphon off cursed energy generated by humans to grow his pool.

But there were its downsides.

He opened his eyes again and glanced at the back of his arm, covered in scratches and healed scars.

The things in dream worlds and nightmares he entered... could hurt him.

If he wasn't careful, and someone's nightmare generated a world-ending monster he had no hope of beating. He would die.

Thankfully, he could manipulate his body just like the real world in dreams. He even retained his cursed energy because of its strange 'smokey' property it had to it.

He could train in dreams as much as he wanted. 

He would spend years there, even if just to enjoy the strange 'dream scenery' different minds could come up with.

Strangely enough... if he spent years teaching a person something in their dreams, they wake up with what seems like a 'talent' for it.

This was after all, why he knew so much survival knowledge, despite being an exile from the tribe. He learned everything each member of the tribe did in their dreams.

He once learned weaving from a woman in her dream.

Only to teach it to a few young girls in the tribe later.

Despite them not remembering their dreams, each of them picked up weaving faster than those who he didn't teach.

The man scratched his forehead as he continued thinking about his next plan.

He didn't have a grand objective, not really.

He was content to simply explore the mysteries of the world and enjoy this second life. As interesting as it may or may not be.

Even if he had to be alone.

*Crackle*

The sound of thunder crackled as lightning lit up the storm above him. 

He glanced up at the sky before back down on the drops of rain sliding down his arms.

The rain was growing heavier. And the thick tree branches he had chosen for shelter were not enough.

He stood up from his sitting position and began to slide from one set of covers to another.

He needed to find a cave.

He hated being wet.