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

The moment Lan Ju spoke, all the arguments were shut down and the matter is settled.

Perhaps, it is because of his powerful cultivation, or perhaps, it is because Lan Ju had admitted that he is a servant of Mark, not his backing. Or it might even be because Qin Mo wanted to get back at Mark for giving more respect to Yang Bingwen.

Whatever the case, Emperor Qin had agreed to witness the demonstration of the weapon that Mark intended to sell to the imperial family.

However, Mark wasn't happy. He felt the same that Qin Mo earlier felt.

After killing immortal realm beasts in the trial, Mark was under the impression that he is more powerful than the zheng even in its peak state.

With Lan Ju's loyalty crossed 50% and behaving really like a loyal servant lately, Mark was already feeling superior to the zheng and that is why he didn't like the sudden change in the behavior of the emperor.

The might of C4 (advanced)