This was only the first level of the Black Tower's abilities.
Ling Han was utterly shocked. It was no wonder Small Tower said to strictly keep the Black Tower's secret, because once leaked, the entire world's strongest cultivators would chase his butt to fight for the Black Tower.
"Say, we're already so familiar, could you give me more one-use power-up chances?" Ling Han cottoned up to Small Tower.
"No!" Small Tower trembled lightly, as if to shake its head.
"Why, we're all on the same side, you don't think it'd be taken by someone else?" Ling Han patiently continued with his persuasion.
Small Tower shook again, and said, "That's not so. The power-up process is actually remolding your body once, you can only endure it once per tier. One more will hurt your foundation. The third time is certain death."
"I cultivate the Indestructible Heaven Scroll, it shouldn't be a problem," Ling Han said.