Chương 357: The 72 Earthly Fiends, Steel City Purchases Armor

Gold, silver, copper, iron, aluminum.

Chromium, barium, plutonium, lead, nickel.

They tried hundreds of different materials for the component.

The energy machine just wouldn't start.

"By the way, have you tried using a crystal core?" Xiao Feng suddenly thought of it. The hardness of the crystal core was incredibly tough. It contained vast amounts of energy. If this were used as a component, it might work.

"That's right!" Cheng Gong suddenly realized. "Quick, quick, make a component using a crystal core!"

Before long, a component made from a crystal core was brought to the lab.

Xiao Feng carefully installed it.

Then he hopefully pressed the start button.

Buzz~!

At that moment, the energy machine began to tremble.

Seeing this, everyone erupted into cheers.

The machine was running, which meant it could be used.

"Hurry, bring a large number of crystal cores!" Xiao Feng eagerly shouted.