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

Along with a few corrupted elven warriors, Mark and Sylvandria started their journey to the other side of the world. They reached Mor Gondamin, the capital city of the kingdom of Dark Elves, after traveling for roughly more than 21 hours.

Even in such time, both of them had passionate sex in the wild three times, once in a forest, once behind the waterfall, and once in the carriage drawn by the horses.

After reaching the underground city of Mor Gondamin, they were welcomed with great respect by the dark elves, despite their disgust toward demonic beings as well as celestial elves. They made sure that neither Mark nor Sylvandria would feel any discomfort about the visit.

The reason for their hospitality is obvious. Sylvandria is a supreme being and Mark is the hero with unknown cultivation and mysterious abilities.

Following the plot, Mark cooperated well by putting up his fake smile until the round table conference started two days later.

Sylvandria escaped the mind control? What does it mean?