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

After a long silence, Mark gave his reply to Tang Yifan, who seemed to be prepared for anything, "Alright, I'll accept your offer."

Tang Yifan clenched his fist once again, but this time, it wasn't because of frustration, but due to his excitement about winning.

On the other hand, Fu Shen sighed in relief in his heart, "Thank goodness. If this young master of our clan took it as an insult and become reckless, it would have been troublesome."

Meanwhile, the new Emperor of the Tang Dynasty let out a victory smirk, "It is good that you took the wise decision, Lu Zhen. Anyway, I'm returning to the palace. Until you leave, you will be the guest of the Empire. So, feel free to spend as much time as you want, for the last time."

Once he said whatever he wanted, the young emperor took out a scroll from his sleeves and poured his ether energy into it.

As it lit up, he then looked at Mark once again, "Goodbye, Lu Zhen. I hope we will never meet again."

Schemes in the shadows