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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Weapon seller in the world of magic

"Confidential? Prince Wen, you forgot that you made a business deal with a criminal of the Empire. Moreover, what proof is there that you aren't lying to hide the bribe?" The Crown Prince took the chance and pointed his finger at him. He felt like he was really on a roll today, first his third brother and now, the second brother.

Unfortunately for him, Shang Wen isn't like the third prince who keeps everyone shut their mouths with his intellect. The second prince is a completely straightforward type.

He gave a quick reply with a bold question, shaking the hearts of everyone present in the courtroom, including his father, "Proof? Let me ask you a question. I want to ask you. Is there proof that you are his majesty's real blood? You haven't awakened our famed Phoenix Bloodline. So, why shouldn't we assume that the Empress had committed adultery?"

The second prince makes a breakthrough