Naruto System in One Piece - Chapter 451: Tsukuyomi!

When the sword awakens, its slept so long that it has forgotten everything but hunger. It is a weapon made to feast on death and blood, and the more bodies that it leaves in its wake, the stronger it gets. Bloodstained Blade is a fantasy gamelit, where the main character is the blade, and not the person wielding it. So, expect the wielder of the blade to die occasionally and be replaced with another man or monster as the Ebon Blade pursues its own goals no matter the cost. Expect: Daily updates, new powers and abilities, numbers to go up, violence, and revenge.

Ye Xiao was a superior cultivator in his previous life. The three factions of the realm kill millions of people every time they attempt to seize cultivation resources. Wealthy towns turn to wastelands in just a single night. They cover up their crime with an assertion that the towns were suffering from pestilence and disasters.

They forcibly hold all the resources for cultivation, monopolize all valuable practice materials, and keep outsiders from cultivating so that only their three factions could cultivate in the realm. Ye Xiao declared war against the three factions in retaliation for their actions. He fought alone and ended up dying in vain. However, he is reborn into the mortal body of a 16-year-old boy. He will use the powers he cultivated in his last life and slaughter his way back into the Realm. The story begins!

- Description from Novelupdates

[#Warning Yandere]Arthur, a 24-year-old man, was living his life normally on Earth, but until one day, on one of the most important days of his life, he died under some unexpected circumstances.But this was not the end as Arthur had expected, as he was reincarnated in the body of a 17-year-old handsome young man. However, the world he was reincarnated into was not a normal one, as things like magic, which he had read about in novels and manga, were common in this world.Yet this was not the most surprising thing he found out, as the people living in this world had reverse gender morality.Arthur didn't get a cheat like those protagonists in the novels he had read. However, due to his greedy personality, he unexpectedly found himself as the owner of one of the greatest treasures of the cosmos, which didn’t tell him anything other than showing a strange riddle.[You have become the owner of Ethelarion Replisis][Name: Arthur]#Ability: I am the shadow that walks with you,Not quite the same but near and true.Half the strength but have many faces,Absorb me to reclaim your grace.Five years ago, when Mana first came to this world through a portal that opened due to foolish nuclear testing by some power-hungry country, but that was not the only thing that came as terrifying monsters also arrived with it.On the brink of their last hope being lost, by some miracle, another portal opened, through which a single female elf came, who wiped out these terrifying monsters in only half an hour. However, it didn’t stop there, as now Elves rule the magical Earth, and against absolute power, no one stood against her.___________#No NTR#No Yuri

Within the Immortal Realm, there were nine thousand major realms, with three thousand at the top, three thousand in the middle, and three thousand at the bottom, along with countless minor realms.