MTL - History’s Number 1 Founder - ~ 1439. To Yang to hot first!

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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All Things of this World, Turn to Ashes, Flowing Blade-like Flame!

Crossing over to the world of pirates(the one piece world) , in the era of pirates, the Roja from eleven years ago obtained a Sword Soul system that lets him strengthen infinitely and extract various kinds of skills.

Flowing Blade-like Flame (Ryūjin Jakka) , Mirror Flower, Water Moon (Kyoka Suigetsu), Moon Fang Heaven-Piercer (Getsuga Tensho), Thousand Cherry Blossoms (Senbonzakura)……

“If this sword descend, you may be roasted to death.” Roja looked at Akainu in front of him and seriously said.

- Description from novelupdates

Qin Wuyue, a pseudo-house on Earth, traveled to the world of Hokage and awakened the legendary Goldfinger. The system is very violent and works flawlessly. As long as you complete the optional tasks, you can directly obtain super-powerful items of cultivation, abilities, ninjutsu and other planes. But Wuyue couldn’t be happy at all, and even had the idea of ​​wanting to die with this damn scumbag.

“You pervert wearing my camisole again” a certain elder sister roared loudly. “Take it, this is the fat time I just changed in the morning.” A certain senior said expressionlessly.

“Jun Wuyue, it’s time to collect material again, take off your pants.” A certain wife next door lit up. “If you bastard dare to steal again, I will break your third leg.” A certain beautiful master shook his fist with a cold expression. “I’m really not a pervert, I’m being forced, you believe me” Wuyue burst into tears, looking up at the sky at a forty-five degree angle

- Description from novelbuddy

"There is a thin line between poison and medicine, and I shall make you dance on it!"