At first, Wang Wu thought the internal cracks had been caused by shoddy forging or deliberate sabotage. But after observing for a moment, he confirmed that they had not been intentionally damaged—they had been corroded by Mortal Qi.
That was truly astonishing.
Yet it somehow made sense.
After all, the Hidden Origin Bell relied on these one hundred and eight Black Iron Sky Pillars to absorb Mortal Qi.
Wang Wu had no mind to delve deeper. There was no use thinking about it anyway; this was something for immortals to handle. What could he possibly make of it?
But how was he supposed to repair them?
These Black Iron Sky Pillars were of extremely high quality, each comparable to a Heavenly Eighth-Rank Destined Flying Sword. Moreover, the cracks were all inside, and the pillars could not be cut open. He could only perform minimally invasive repairs.
Wang Wu first located the internal cracks. Then he shrank himself down to one millimeter, used his Destined Demonic Weapon to bore a one-millimeter hole into the Black Iron Sky Pillar, and crawled inside. After finding the crack, he took out his Refined Mysterious Iron, melted and tempered it with Crimson Flame Spirit Energy, then patched it into the Black Iron Sky Pillar.
He repaired it bit by bit until he finally emerged outside again.
The repair method was primitive and crude.
The results definitely would not compare to the original version. Hopefully, it would work.
At this point, Wang Wu had no other options.
In short, after a round of frantic work, he patched every internal crack flat. Just as he was about to check whether the Nine Heavens Tribulation Fire Formation above was intact, he heard a soft hum. A faint flash of spiritual light, nearly impossible to notice, flickered across the