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

<p>Mark controlled his happiness by clenching his fist and trying to be as calm as possible as he replied, "Bael once told me about the existence of a beast named Leviathan. I wish to form a contract with it. But, I don't know its location and I don't have enough time to explore this entire realm in search of the beast. If you kindly help me, it would help me a lot."</p>

<p>"Guardian Leviathan?" The demon's eyes widened in shock before a chuckle escaped from him, turning into a burst of laughter, "seriously? Hahaha… oh, great devil… I never thought I would hear such words from a mortal in my whole life. You looked like someone who is still in the Body forging stage (<demigod) and you want to form a contract with the Great Leviathan? Hahaha…"</p>

Mark acquires a demon slave