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

The supposed upgraded missile, Song II, turned out to be weaker than the original Song missile created by the system, mainly due to the fact that system-created missiles have 100% energy conversation while the one he currently built only had like 45%.

Hence, while Alina focused on upgrading the missile, he was focused on the warhead.

The factory, which was upgraded to the maximum level before the exit of the system, has already the necessary equipment to create every type of weapon he could. The only problem is with the procurement of materials now that the mining system, unfortunately, didn't materialize with the factory.

Hence, Mark could only recycle the existing warheads lying in his inventory, increase the quantity of fissile materials, improve the efficiency of the implosion mechanism, and eventually increase yield. But, that also decreased the energy conversation rate in the process.

Testing the missile (failure)