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

The secret of Mark's grandfather is only known to him and him alone. Neither his brother nor his superiors were aware of it. To the public knowledge, he died during the Central European floods. Even Mark would only learn of the truth before his parents left him and his brother before joining the war in central Africa.

The fact that this teenager who was claiming to be his son is speaking of that matter only aggravated his mood further. Either the well-kept secret was also got out somehow or everything he believed until now was a lie.

On the other hand, Steve was a Supreme Being and a normal human like Mark (at the moment) catching his neck doesn't hurt him a bit. However, the emotional bond he had made it harder for him to get free by force and let Mark's hand tighten over his neck. At the same time, he was mentally hurt and frustrated, not knowing how to convince his dad.

Enter Neo, the super A.I.