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

Three days later, Mark and his companions left Helios City and journeyed to the western neighbor, the Kun Empire.

As the empire's capital was far away from the shore, Mark chose the land route, traveling by the traditional carriages instead of LMV.

Those carriages and their respective coachmen were provided by the palace. Obviously, they weren't your typical horse carriages either. Both of the carriages were pulled by bicorns, which are 4-circle Spirit Beasts of the dark attribute. These dark horses with two horns could run faster than the maximum speed attained by LMVs.

Adding on top of that, the presence of the royal family's crest helped Mark to cross the border without facing any questions from the guards posted at checkpoints or worrying about the directions.

As a result, Mark not only got qualitative time alone with his fiancée and saved the effort of driving but he was also able to cross the border before sunset.

The coachman's fortuitus encounter