Twin Reincarnation: Epics Of The Worldline - Chapter 8: Skill creation

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!
In this whole new world, he was born again and got to explore the fantastic martial world!

- Description from Novelupdates

[I have led a cautious life, but the system keeps trying to do me in] “Ding Dong!” “Welcome to the Smart Cultivation System!”

“You have chosen to cultivate the Bone Forging Art. The system will start cultivating for you. The system has detected that the host is missing the Bone Tempering Pill. Please wait a moment…” “Ding Dong!”

“The system successfully stole ten Bone Tempering Pills for you, and the cultivation will continue…” “Important reminder, while the system is cultivating, you will lose lose control of the body…”

After getting the Smart Cultivation System, Pei Ling began to grow stronger rapidly. He was prepared to become a deity until one day… “Ding Dong!”

“You have chosen to cultivate an unknown technique. The system has identified this as a dual cultivation method. The system will start to cultivate for you. The system has detected that the host is missing a Dao Partner. The system is looking for a Dao Partner for you…” So, Pei Ling watched as he ran to the fairy’s training room next door, drugged her, and carried her into his room…

Once through the pirates, Lu En became the son of Monkey d Dragon, a grandfather named Monkey d Karp, and an unreliable and neurotic younger brother named Luffy.

Fortunately, the ghost back system is activated!

The completion of the ghost back is 10%, and the training effect is increased by 100 times!

The completion of the ghost back is 20%, and the training effect is increased by 1000 times!

…

One day, Lu En, a ghost-backed master, appeared in front of Luffy who was shouting to go to sea, and made Luffy cry on the spot.

Luffy: “The pirates in the sea are all monsters like my brother? I don’t want to go out to sea!”

Garp: “For a long time, the two boys, Long and Luffy, with small arms and calves, I really doubt that they are not my sons and grandsons. Like Lu En, they are the grandsons of the old man!”

Warring States: “The strongest creature in the sea, land and air is Kaido? No, it’s Lu En!”

- Description from novelbuddy

Emperor Zi Yu used 5 strikes of his axe to split mountains and unify everyone underneath the heavens. He partitioned the land into 9 areas, thus establishing the Nine Cauldrons which eventually became known as the 9 prefectures.