A Sci-Fi Mage, and Making Black Holes by Hand Is Perfectly Reasonable, Right?

This is a world overrun by demons, where everyone is a mage.

After transmigrating here, Zhou Zheng awakens as a metal mage.

Other metal mages can only control the element of metal, but he can control every metallic element!

And so:

While other mages build magic arrays to cast spells like fireballs and wind blades, Zhou Zheng builds arrays for pistols, machine guns, and more, using elements as ammunition.

When other mages change their specialization to ice or healing, Zhou Zheng switches to the physical sciences.

"I'm a physical sciences mage. Is it okay if I wear an Iron Man suit and use a nuclear bomb as a forbidden spell?"

"A physical sciences mage switching to sci-fi magic as a second specialization makes perfect sense, right?"

"A sci-fi mage making a black hole with his bare hands is totally reasonable, right?"

When an alien army descends, ready to conquer Earth, they look around and realize their home is gone!

Alien army: "Um, would you take us on as your servants? We're capable, not picky eaters, and pleasant to talk to!"

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.