Tate no Yuusha no Nariagari - Chapter 9 - Something Called a Slave

[DING! Congratulations to the Host for obtaining SSS-Rank Dark Dimensional Reality Talent][Attribute: Darkness]Freed from nuclear war terrors, all humans now have to face the new reality of their fate.Humans are given a power that allows them to have different talents according to their abilities and luck, including obtaining the power of past heroes.Aaron Lewis, an 18-year-old young man, must bear the devastating reality that his mother was killed by an unknown group. The turmoil of uncontrollable rage in his heart makes his talent affected.[WARNING!][System detected Darkness attribute energy increase][Initiates talent rank evolution][Adjusting talents with attributes ][Evolution Completed]Just as Aaron opened his eyes, he saw he was floating in a void dimension with thousands of caged ancestral souls waiting to be freed or summoned. They are the souls of heroes from all over the world.[Main Talent: Dark Dimensional Reality][Rank: SSS-Rank]With his flexibility to explore dimensions beyond ordinary human sight, Aaron gathered thousands of ancestral souls and turned them into his army.To his surprise, Aaron found a way to free his mother's soul and bring her back to life, which was to become a Great Ruler.“There is no other choice. I will become a Ruler.”

Travel to the world of One Piece?

They come, the security;

Became Don Quixote Rossindi?

Forget it, it can’t be reopened;

But after realizing that he had eaten the fruit of silence, the little boy became restless.

Fruit of Silence, this is one of the devil fruits that can compete for the title of “the most useless” in the world of One Piece; it is only a little better than Chopper’s “Everyone’s Fruit · Common People’s Form”!

“Dover, you said you are a devil fruit wholesaler, why do your family eat all kinds of weird ones?”

Facing the bewildered little Dover, Rossindi patted his forehead.

“Forget it, let’s practice domineering hard.”

- Description from novelbuddy

After transmigrating, Chen Yu found himself in a highly militarized world. But the “will of the world” had concluded that he was an intruder and put a curse on him.