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

Ji Palace, Gong city, Western Yan;

In the palace, Mark and a few higher rank members of Kunyu bandits took their seats in the place where that earlier meeting Ji clan held it. Behind Mark, the demon was standing like a loyal servant to keep up appearances, although he was the strongest person here. He doesn't have a thing such as an ego when he is summoned. So, no harm is being done here.

"Okay, the sun is about to rise and I need to return to prevent any unnecessary suspicions. Any problem, just send me a message." Mark said to everyone as he rose to his feet.

As the others got up their seats too, Feng Wu slightly bowed in respect, "Once again, thank you for your help, Owner Lu. I never expected to go our war this smooth."

Assassination attempt on Xie Mei