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.
***
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.
**************
Author's current works: War Online, My Soul card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
**************
You can also support the Author through Patreon

https://www.patreon.com/snowstar

Weapon seller in the world of magic

100 million gold coins over the next five years. It means that on average, the Genesis Store would earn more than fifty thousand gold coins every day just from the Imperial Palace, alone.

For a moment, it felt as if an electrifying spark passed through his veins.

While Mark put aside the plans of dethroning his biological father and changed his strategy to make the Imperial Palace heavily dependent on firearms, he never ruled out the possibility of creating a civil war.

And if he committed to five years of peace, who knows… he might even stop hating his biological parents. Hatred is the one that is fueling Mark to progress. He doesn't want to do that. Not to mention, he might create nuclear missiles within that time.

Hence, Mark opted to seek a different solution. After thinking for a bit, he said to the second prince, "100 million does sound tempting but 5 years is too long, Your Highness. If I were to do this, then, I wish to have weekly guarantees."

Making a visit to the Black Citadel