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

Ji Guanli never met the fourth prince. So, he wondered whether the person sitting before him is the infamous leader of WEB, the strongest spy network in the Empire.

Guanli's question brought back Mark to reality. The latter answered, "who am I is of no importance to you. But then again, I was actually quite foolish to discuss the future with you, which you don't have anyway. With such meager strength, your clan is also doomed. So, how about we talk about something else?

Tell me, what do they teach in your academy?"

"Just what in the hell do you want?" Ji Guanli roared at him in frustration before started coughing a bit. It was clear how massive the difference is between Mark and Alina's interrogation.

The teenager doesn't even have the energy to argue much less fight. For the first time, he regretted, taking the advancement pill. How could he have expected that he will run into trouble even with his elite guards?

Mark's factory