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

Xie Zhong flew out of the ring and crashed onto the ground. However, he didn't wake up and lay there motionlessly, causing a great panic among the disciples of the sect.

The proctor hurriedly went to him and checked his condition. "He is not dead." He sighed in relief upon finding that the sect's Patriarch was just knocked out.

"Don't worry." A voice was heard from his behind and he glanced at Lan Ju. The latter continued while walking calmly toward them, "I just struck his chin, which affected his brain, leading to that state. He will be alright within a couple of minutes."

The Elder then rose to his feet and took a deep bow in fear and respect to this Supreme Being who ended the spar in two moves after defending himself from Xie Zhong's barrage of sword attacks for a couple of minutes. "Thank you for the demonstration."

Dragon warrior tournament (part-1)