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

Around 3:50 p.m., somewhere in the busy street of the slums, located in the outer sector of the Imperial City;

Two men, disguised with masks and hoods, entered a seemingly ordinary-looking inn named "Chengwang".

One of them pinched his nose and expressed his disgust as he looked around the place, "this place is stinking so much. Are you sure we came to the right place?"

The other man nodded, "Please bear for a while, master. We will return soon."

"Fine. But, this needs to be done quickly. If I stay for ten minutes in this disgusting slum, I would get sick." The servant's master couldn't bear the sight of poor hygiene. He might be a rich guy.

Anyways, soon, both of them walked to the reception desk where the manager is sitting. She's a middle-aged woman who is nearly 8.3 ft tall and wider than both of them combined. One of the hooded men flinched when he saw this monster in human skin.

Soul, the organization of assassins