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

Shang Wei stood there in silence with his head hung down as Mark got up and patted his shoulder, "It doesn't matter whether you believe it or not, but this is the truth. I'm going to send you to our Lan Sect's guardian where you will stay disconnected from the rest of the world and spend there until I'm done with tearing apart the Shang Dynasty that our dear forefathers painstakingly built it up. Take this time to make up your thoughts."

"I…" Shang Wei wanted to say something but in the end, he cooperated, not because he blindly trusted Mark's words or because the truth is too much to take in. It is because he was worried about Lin Xue's safety.

With a call from Mark, the 15-year-old entered and once again confirmed with his appearance that it was Mark who was behind Shang Jun's arm severing incident.

Unveiling truths