Snowstar

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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Author's current works: War Online, My Soul Card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
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You can also support the Author through Patreon or buy coffee on Ko-fi.com

https://www.patreon.com/snowstar

https://ko-fi.com/snowstar5061

Weapon seller in the world of magic

Sometime later, on a large island, as millions were being massacred indiscriminately by thousands of robots and the buildings were being destroyed by explosions one after another, Mark was laughing like a crazy villain while observing from a helicopter.

"Now, the whole world will understand what will be the result of offending me. Hahahaha…"

Within no time, the enemy country has fallen and the king was on his knees before Allen. Behind the king who had a striking resemblance to Song Yun, there were about a thousand soldiers in the same condition without any willpower left.

And around them, there were hundreds of robots with rifles in their hands.

The king raised his head as he saw the helicopter land and Mark gets down, walking toward him.

When Mark reached the king and looked at his face, he stepped back in surprise. For a few seconds, unrelated memories appeared in his head where he only did nothing but caused destruction using his battle tank.

Seven deadly sins (part-2)