Swift Movement Technique

It took exactly eighteen seconds for the Castle of Black Iron to complete the construction of the subterranean cavern. Zhang Tie, who had personally experienced the Castle of Black Iron's creative power, took quite a while to recover his composure after everything in the space returned to normal.

Heller stood by Zhang Tie's side the entire time, holding a fluorite lamp, waiting for him to regain his senses.

"Just now..." Zhang Tie swallowed hard, struggling to find his voice.

"Everything is merely the application and manifestation of energy!" Heller replied with the calm of an ancient, undisturbed well.

Zhang Tie knew he wouldn't get any more information out of Heller, so he stopped asking. He looked up at the seven-colored mist swirling around the entire Castle of Black Iron; it was that very mist that had created and manifested everything in just a few short seconds.

There is a great secret hidden within those seven-colored clouds, Zhang Tie mused to himself. However, he lacked the ability to investigate such a mystery at this moment.

Seeing that Heller was ready, Zhang Tie didn't say another word. The two walked directly into the underground tunnel. Heller led the way with the lamp, and Zhang Tie followed behind. They descended along the winding, spiral-staircase-like path. Before long, Zhang Tie felt a red glow reflecting off the walls on both sides of the tunnel, and the air grew noticeably hotter.

Rounding the tunnel entrance, the underground cavern filled with magma that Zhang Tie had just created appeared before his eyes. The entire cavern space was exactly as he had envisioned: stalactites hung from the ceiling, while a lake of fiery red magma lay below.

Naturally, Zhang Tie wouldn't just toss the Blazing Red Lotus seeds into the magma lake. He didn't possess his master's