One Piece: The Strongest Swordsman - Chapter 20: Nico Robin

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

Raven Astral, a reclusive billionaire known for his unmatched intellect and business sense, finds his world shattered when his beloved younger brother, Weiss, disappears without a trace.

Determined to save his brother, he enters the world of “Hellfire,” an unprecedented and highly immersive game-like world that was also known as the Graveyard of Gods.

Endowed with immense wealth, Raven embarks on an audacious journey into the heart of Hellfire, setting him apart as the wealthiest player to grace the world of Hellfire.

And so, the odyssey of the Wealthiest Ranker commenced—a journey seeped in searing flames of vengeance that would turn the entire realm upside down, reshaping the destiny of all who dwelled within its formidable borders.

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Long Chen, a crippled youth who cannot cultivate, is constantly targeted and bullied by his fellow noble heirs. After a particularly vicious beating, he wakes up and realizes a Pill God’s soul has somehow merged with him, giving him some additional memories. Within those memories is the mysterious Nine Star Hegemon Body Art, a cultivation technique that even he can train in, but whose secrets and origin are still a mystery to him. Relying on his improved instincts as he finally begins to cultivate, he realizes a huge conspiracy is underfoot within the Phoenix Cry Empire, one involving his father, members of the imperial family, and even the Emperor himself.

In order to solve the mysteries around him, he must rely on his new alchemy techniques and the powerful but baffling Nine Star Hegemon Body Art. Countless enemies block him as he attempts to climb to the peak of the cultivation world.

Fate destined him to be only a chess piece, but he would not bow to the will of the Heavens.