Naruto System in One Piece - Chapter 302

In the twenty-seventh year of Hong Guang, the allied forces of seven nations invaded the Great Blue Dynasty.Rifled muskets, mortars, and armored vehicles combined into a steel tide, were ultimately shattered by the Great Blue's armored cavalry.Muscle, magic, firearms, cannons... the new and the old powers continuously collided.In an era of great strife, Li Fei, with the help of a Ten Thousand Blood Bead, gradually became an existence akin to a BOSS:'Is this the extent of your damage? You haven't even taken off one-thousandth of my health.''You don't think this is enough to kill me, do you?''Don't rush, the second phase is up next!'......

A cultivation story about how a declining sect is restored by a narcissist, a troublemaker, a meanie, an idiot, and a wimpy kid.

- Description from Novelupdates

In the vast and grand universe, myriad treasures and artifacts existed, some crafted by the Grand Dao of the universe itself, while countless others paled in comparison to the might of those created by the Grand Dao.Yet, amidst the cosmic expanse, one individual achieved the extraordinary feat of fashioning a treasure on par with those birthed by the Grand Dao.This creator wasn't mortal, nor an immortal cultivator who had ascended to the pinnacle of power.Neither inherently good nor bad, this enigmatic figure stood as the genesis of countless races—a shattered being unlike any ever witnessed.Known by many names, the most prominent being the 'Son of the Universe'.Born directly from the Grand Dao of the universe, he was not the first entity to be brought forth in such a manner.The universe had previously given rise to beings governed by the System of Reality—known by various titles such as Heavenly Daos or World Trees—acting as gods of creation for innumerable planets across the universe.These divine entities, also referred to as the 'Daughters of the Universe', were exclusively female, with no sons among them.However, the Grand Dao of the universe defied this established norm, birthing a Son and thereby breaking the rules of the System of Reality.The treasure forged by the 'Son of the Universe' was lost to time, only to reappear fortuitously in an alley on a fateful night.On that particular night, a young man named Sam Hailstorm stumbled upon this extraordinary artifact, forever altering the course of his life.As for why the Grand Dao birthed such an unimaginable being, why this treasure found its way to Sam, and the purpose behind the Son of the Universe creating such a powerful artifact, join Sam on his journey of discovery as he unravels the truths and destinies that lie ahead.

The protagonist travels through Shu Mountain and becomes a demonic dragon guarding the heavenly book in Dinghu Peak.