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

https://www.patreon.com/snowstar

Weapon seller in the world of magic

"During earlier and even now, you kept saying that we'll pay for this. I'm curious. How strong is your clan, anyway?" Alina asked the boy.

Mark had the questions to ask but he let his Android Assistant be his mouth for she had a passive skill that can easily extract the information from lower realm Spirit Warriors and civilians.

As if he was hypnotized by her voice, Ji Guanli answered right away, "The strongest person in our clan is my great grandfather. He is a seven-circle realm warrior who is just a step away from reaching peak stage.

Other than him, there are 8 Elders with each of one in the six-circle realm. There are more than 20 five-circle realm experts and 42 four-circle realm experts working for our clan."

Mark's stern warning to the heir of Ji clan