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 or buy coffee on Ko-fi.com

https://www.patreon.com/snowstar

https://ko-fi.com/snowstar5061

Weapon seller in the world of magic

At around 11 o'clock in the morning, the light multirole vehicle arrived at the royal palace.

Western Moon's Prime Minister Zhu and other important officials were waiting for him at the entrance.

As Mark slide down the window and looked outside, he saw the familiar face. He opened the door and stepped outside while telling the remaining people to stay inside.

"Greetings, Lord Lu." Zhu Jianhong gave a 90-degree bow alongside the other soldiers stationed there. Mark was never greeted with this much respect before. So, he was a little bit taken aback but controlled his calm expression and nodded, "Thank you for the hospitality, Mr. Zhu. Shall we go?"

As the soldiers moved aside, Mark got back into the vehicle and drove through the entrance, eventually reaching the impressive white marble building, shining brightly.

The six demigods of the world