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

"It was the time when Emperor Ku ruled the world. Back then, there are no wars around. The beasts roamed the land freely while the humans lived in their settlements without the worry of any invasion.

I was born as the daughter of a noble and Houyi was born in a small village. Usually, we were born in different worlds that couldn't align with each other in any time period.

But, the sudden appearance of the Cosmic Orb of Malevolence plunged our Diqiu realm into chaos. People became greedy. The nobles wanted to rule, the commoners wanted to hunt down the beasts to get stronger, and the dragons wanted to loot the people, ugh… that was a decade I couldn't forget even after a long time.

As the ancients often say, heroes rise in turbulent times, Houyi's talents as an archer made him well known all across the world over time; with blessings from Emperor Ku, he became the guardian of the world.

Chang'e and Houyi's back story