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

The invisibility wore off right away and Yao Ling was seen on his knees with two on his stomach of which one of them cleanly pierced the navel while the other only heavily bruised the skin.

The blood was gushing out of his navel at a rapid pace while he helplessly fell to the side, "you bastard…"

Meanwhile, Lin Xue, who leaped forward in reflex, slowly landed on the ground and looked at the scene.

A look of surprise appeared on her face, "Yao Ling was defeated just like that?" She turned her head to look at Allen, who then explained, "I attacked his navel, where not only the central focal point of the energy pathway system is located but was also one of the vulnerable parts of the human. Without any external defensive barrier on top of a body, it is easy for my laser beams to strike it. He was quite careless to attack me, I should say."

Lin Xue and Allen's first quest (part-7)