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

"If that's the case, I will refuse the sword. For you, he might be a rank-5 Android but for me, his family. His value can't be measured by some sword or money." Mark didn't even take two seconds to make the decision. He was very firm on it.

*Ding! Think about it once again, the sword isn't a normal one. People wouldn't hesitate to wage wars against kingdoms to acquire such a sword.

Mark no longer paid attention to the system that was trying to tempt him.

Looking at Emperor Shun, He opened his mouth, "Emperor Shun, I have decided. I choose…"

*Ding! Then, instead of Allen, the host can choose either Battle Tank-V or Attack helicopter-EC 665. In exchange, the system will erase the soul fragment of Emperor Shun and bind it to Allen Spencer. Deal?

Mark stopped talking when the new notification arrived.

Emperor Shun furrowed his brows, "what happened, young man? I'm waiting for your choice."

M134 Minigun