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

"What?" Mark was taken aback by her request.

The woman blinked twice and said. "I said teach me the skill. I want to learn."

Mark crossed his arms to the chest, his eyebrow raising in a mix of displeasure and curiosity. "And why do you think I will teach you?"

The woman replied in her usual plain tone. "Because we are family."

Mark didn't know whether to laugh or get angry at this obnoxious woman. In the end, he pinched the bridge of his nose and said. "I cannot."

"Nothing is impossible." She argued, not moving from the spot.

Mark let out a sharp exhale. "I don't care how you see it, I cannot teach you. Now, leave my home."

She remained seated, unbothered. "No."

Mark's eyes darkened. "I will kick you out."

Silence. For the first time, her expression shifted slightly—just a fraction. "You cannot. I'm stronger."

One hit knock out