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

Mt. Lan, Kunyu Mountain range;

It's been more than 3 hours since the Grand Secretariat was abducted and brought to the ruins of Lan Sect.

While it appeared like he was just silently kneeling in front of the demon king, in reality, his soul was pulled into an illusionary realm created by Bael.

There, he was being tortured with all kinds of punishments the demon could think of.

The reason, he didn't speak the name of the mastermind and maintained his stance that he was the one who ordered the execution of Lu Zhen's parents but wouldn't give the reason for it.

As threats didn't work on him because of lacking any family and Mark clearly didn't buy Li Zheng Kang's lie, he ordered the demon to punish him in his own style until his time in the mortal world is finished.

In the meantime, he returned to Helios City and acted as if he was just woken up from sleep.

A deal from Leon Empire