The Nine Cauldrons - Volume 5 - Chapter 587 The Mastermind

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

He is Monkey D. Luffy, but not the original Monkey D. Luffy, because in this world, that one is Lucy, his blood sister, while he had a peaceful childhood with his other three brothers. They all ended up following different paths since he didn’t have his memories. It was only when he entered a barrel lost at sea to save himself that he finally began to regain all the knowledge he had of this world from his past life. On top of that, he realized he could use this knowledge to his advantage to acquire everything he needed on his adventure. He was given four chances to summon people to start his journey, and more importantly, he finally received his two devil fruits, becoming powerful from the very beginning, with a plan that stretched to the end of his adventure.This story is the adventure of a man called Monkey D. Luffy, with the goal of becoming the emperor of all the seas in the world. For that, he will find the One Piece and destroy the World Government, for they cannot coexist. Be it the Marines, government agents, CP units, Tenryuubito, Holy Knights, Gorosei, or Im, Luffy will walk over a mountain of corpses.“I want you in my crew. Together, we will change the whole world and turn it upside down.”“Hahaha. Don’t worry, I believe in your potential, that's why I want you in my crew.”“My swordsman already fought you and lost. Now let’s see the strength of the world’s greatest swordsman too, right, Yamato? I hope you don’t mind fighting two rookies at once...?”“Awaken... Awaken my power... and destroy all your enemies...”“It’s good to see you after so long, Grandpa... and you, sister.”“Monkey D.? The most dangerous family in the world!”“Isn’t it a beautiful scene? Two Shichibukai and a Vice Admiral as my trophies! Come on, take a good picture and put it on tomorrow’s newspaper cover!”“I declare this kingdom my territory!”“Enel, you’re nothing but an idiot with a god complex. If you’re a god... then I’m a god slayer.”“As you said, Teach, people’s dreams never end! And if people’s dreams never end, why should I stop?”“Doflamingo... Jake... you’re so far from home. I hope you don’t regret this.”“You narcissistic woman, how can someone be so annoying and arrogant?”“What did you say, you damned man?!”“I now declare you husband and wife.”“It's time to return to the Blue Sea, after all, we have a world to shake.”“CP9? What a disappointment, Sengoku. I want money for them and Doflamingo... I want 2 billion berries at Enies Lobby in a few days.”“Enies Lobby was completely destroyed...?”“I've fought Mihawk, Jimbei, Crocodile, Doflamingo, Hancock, and Moria... you're the only one left, Kuma...”“It seems we've finally met, Rayleigh...”“Let's invade Impel Down!”“I came here to find you, sister, it's time for you to join my crew... Joygirl...”“It looks like we've finally arrived at the war.”“Sengoku... you tried to arm yourself to execute my brother, so I'll make an example of this Tenryuubito for the whole world.”“You can't do this...!”*BANG!*“He actually did it, that bastard....”“Your chains are loose, move your ass and get out of Marineford!!”“Saturn!!! I'M GOING TO KILL YOU!!”“I couldn't kill you last time, Akainu... but I'll make sure to do it now.”“Destroy the rest of Marineford.”“Let's get out of here. When you return, you'll take over this country for your family, Rebecca.”“No matter if we're on opposite sides... I will always love you, grandpa.”“It's time to start our training.”“Let's begin. Now, let's head to the New World, capture territories, and grow our fleet.”“Is the entire Straw Hat fleet ready? Now let's head to Wano, after all, we have a war against two Yonkou!”

Loose cultivator Shi Lang gradually found himself in the realm of invincibility. However, when he finally tried to ascend to the higher realm, the spirit of the world was nearly exhausted.

So, between his ascension to a new world or the well-being of his home, he chose the latter and sacrificed his life to save the world.

Nobody knew what he gave up for the world, and he told no one.

Although his sacrifice had gone unsung, there was still someone who witnessed everything. A treasured artifact he carried on his body preserved his soul and let it escape a tragic end.

Eons passed.

The human race stepped out from the age of cultivation into an age of stellar conquest.

The spirit energy in the world was now scarce, but humans found other means to excel.

In this highly-advanced time, Shi Lang's soul has found a chance to be reborn.

What happens when an ancient cultivator that neared the level of a deity before his first death gets a second chance at life in the space age?

The world had changed when the System arrived, alongside the Cataclysm that filled the world with monsters. The technology was gone, replaced by classes and skills that allowed the people to fight back. When Devon ended up as a Blacksmith, a class that didn’t grant Intelligence, he had to face the reality, that his old career that he loved - mathematical sociologist - was over. Instead, he had ended up as yet another discarded member of the production class, overshadowed by the existence of the System Shops to the point of total marginalization. But, what if all he needed was to reapply his scientific thinking to the System...