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 another peaceful day in the life of Mark. He was strolling in the streets of the capital city/imperial city/the only city in the state, named after Mark's hometown back in his past life. Mark was enjoying his alone time to reorganize his thoughts as he walked around and greeted the passersby on his way.

"I'm truly wasting too much time on dealing with the Leon Empire, but I can't just directly destroy them cuz that would incite unnecessary hatred from the rest of the world. Since I won't be there to protect this place, what if some organizations use the opportunity to attack?

But then again, there are demigods too. But, the last time I was away, the enemies destroyed so many of my robots and took away Anan. I can't just put my entire trust in the guardian beasts and a couple of demigods.

Shang Jiao battles Xie Tianyu