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

https://www.patreon.com/snowstar

Weapon seller in the world of magic

Three days later, Helios City;

At the entrance of the capital city of Eastern Sun, which lies on the northern coast of the southern province of the kingdom, an army of about three to four hundred soldiers was on standby with each one having a rifle in his/her hand while their general was staring at the sky in anticipation in order to proceed with the orders came from above.

As the soldiers were staying in this position since morning without any movement, some of them became busy scolding Mark in their hearts.

The sun is on their head, they didn't have any food or even water, and their legs were about to give out. However, not one of them dared to speak or even move from the spot for the orders from a King are absolute. Because of that, even the nearby citizens who gathered on the sidelines out of curiosity couldn't leave either as it would be disrespectful to their king.

An alliance proposition to the Eastern Sun kingdom