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

"These are seven cosmic orbs that formed when Pangu died after creating the universe.

The seven of them are scattered all over the universe and countless people went on searching it for billions of years and are still in their search.

One of those orbs was accidentally swallowed by a mortal and became the Chaos Lord.

He was so strong that deities, beasts, demons, and mortals trembled in his presence.

More than a hundred million years ago, after the Jade Emperor eventually killed him, he stored the orb of chaos in the heavenly palace's treasury, but as it started corrupting the other weapons, His Majesty had no choice but to appoint the protectors.

The system's true identity (part-1)