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

"Second Prince?" Mark's expression changed immediately as soon as he heard it. Mark stared at him with a deep frown. There were complex feelings in his heart.

Everyone within the Empire knew about the relationship between the Imperial children.

The first prince was born to Emperor and the Empress.

The second prince was born to the Emperor and his first Queen consort.

The third prince and fifth princess were born to the Emperor and his second Queen Consort.

The fourth prince was born to the third Queen consort.

The first Queen consort was an orphan with who the Emperor has fallen in love and used to be his favorite consort. But, on the night he turned 15, his mother died in an assassination.

With no one to look after him, he was forced to choose the military way and eventually climbed up the ranks, becoming one of the four generals by the age of 27 and maintaining the position for 5 years now.

A deal with the second prince (part-1)