One Piece: Don't Worry, I'm a Doctor - Chapter 27 - : I’ve Got Plenty Here

The Empress does not grant my resignation.

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet."
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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Beside the coast, a hundred-meter star gate is overflowing with light.

Outside the star gate, the army made of steel can’t see the edge at a glance.

On the sky, a fighter jet flew across the sky, interweaving the iron curtain.

In the distant ocean, aircraft carriers, destroyers, and frigates are all over the sea, ready to go.

All the muzzles were aimed at a figure walking out of the star gate.

“I order you to withdraw in the name of the Federal Command, otherwise, all-out war awaits you.”

“war?”

Ancient and Jinlai took a step forward, and his body rose against the wind. In an instant, he grew from less than two meters to a Chaos Demon God thousands of meters high. The brilliance of a white dwarf radiated from him, and his own gravity alone caused it to be caused by thousands of miles around. Lightning and thunder, tsunami tides.

He bows his head…

Looking at a toy-like war weapon.

Reaching out, a hydrogen bomb fell into his hand.

The electron degenerate star nucleus in the body releases helium, and the helium element expands. The terrifying high temperature instantly causes the isotopic elements of hydrogen to aggregate deuterium and tritium, and the energy explodes. The sudden white brilliance is like lighting a sun on the sea.

Before waiting for the sun’s energy to be released, he closed his hands together, and the blazing whiteness mixed with hundreds of millions of high temperatures was compressed and sealed in the palm of his hand, escaping less than half of it.

“I think you should choose peace.”

- Description from novelbuddy

Gao Yang was an orphan who, at the age of six, crossed over to a “parallel world” and began living in a warm family of five.When he turned eighteen, Gao Yang accidentally discovered the truth about this world: it wasn't a parallel world at all, but a mysterious realm, and the loved ones and friends around him were all terrifying “Monsters”!Gao Yang, upon uncovering this truth, narrowly escaped death and, at a crucial moment, gained a system called “Luck” .The longer he survived, the stronger he became! And so, a deadly game of sheep and wolves unfolded...