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 Necromancer King nodded in seriousness, "Alright, I accept your alliance, the assistance, and the conditions that followed through. However, the heads of the Shang Dynasty ruler and his kids are mine."

Soon, both of them disappeared from there. After a while, the necromancer king's entire undead army also disappeared from the forest, at the same time.

Meanwhile, at Fujian Island;

Early in the morning, Shang Jiao was seen intensely sparring against a white tiger, which has shrunk to her size for the moment.

She raised the exquisite staff adorned with several crystals on its head and spoke out the long incantation, "Oh, the goddess of snow and ice, Tengliu, I crave thou to bless me the strength to unleash the serpent of ice and vanquish the enemies from my sight."

The tip of the semi-divine staff glowed for a second before conjuring a giant ice serpent.

Frozen Battles and Fiery Tempers