Devouring Dragon Heir - Chapter 27: Ch iceworld? more like torture chamber

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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The Republic of San Magnolia.

Chu Nan is born in a cultivation family. But after his parents disappear, he is treated as a slave by his uncle, who takes Chu's blood to help his own son's cultivation and even banishes Chu to a wasteland.However, Chu awakens the mysterious force hidden in his blood and swears that he will take his revenge.“Nine Desolate Profound Transformation Scripture, Devour all demons as foundation, Absorb myriad beasts as blood, Reverse the progenitor of all beings, Create the sole Dao Body within heaven and beyond the heavens!”

You had taken up the Student profession

You had now reached level 7.

Acquired skills: elementary school knowledge, junior school knowledge, and senior high school knowledge.

You took the university entrance exam and scored full marks.

Your have been upgraded to level 9, and you have activated the profession-change interface.

You became a scientist and gained R&D skills.

You used R&D skills and gained space fortress-building technology.

You used R&D skills and gained starship technology.

You are now invincible.