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

At the dawn of the following day, Mark, Song Yue, Black Knight, and Allen departed from the Imperial city, traveling in the bicorn carriages given by the royal family of eastern sun, a while ago.

Xie Mei was left behind at the store, and to keep an eye on her, the manticore was also left at the store.

As for Lan Ju and Jinlong, they traveled to Western Moon and joined the princess.

Following them from behind, an ambassador from the Phoenix Empire also left for the Eastern Sun as a formality. However, strangely, this ambassador wasn't any politician or a member of the imperial court. Instead, it was the fourth prince who usually never steps out of the palace.

Mark didn't know about it and didn't care even if he knew.

Under his orders, the bicorn carriages traveled through the Dwarven kingdom and then went through the Leon Empire, entered the Eastern Sun kingdom, and finally reached the destination by late in the evening.

Going to Helios City