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

"Uh, right away? It's dark outside. Not safe for testing." Mark doesn't want casualties to occur when making such a good deal. So, he couldn't help but hesitate.

The second prince thought for a bit and asked, "Then, will you stay here until the morning?"

In a normal case, Mark would have rejected but for the sake of the deal, he agreed to it. "No problem."

"Fu Chao…" The second prince called out someone.

A person in cotton wear entered the tent and bowed, "Your Highness."

Shang Wen pointed his hand at Mark, "Lu Zhen is our esteemed guest. Make preparations for his stay."

The attendant bowed to the prince and left the tent.

After a while, he returned and spoke politely, "please follow me."

"We'll meet tomorrow morning, then." The Second Prince gave a farewell to Mark and went outside for a usual patrol to check on his subordinates.

Loyalty of contracted Spirit Beasts