There was no mistake, absolutely none!
This ruined giant city before them was indeed the once-renowned Dragon Abyss Immortal City.
Back when the Primal Devil Sect still existed, it had been an exceedingly brilliant pearl among the sect's properties.
It was said that in those days, high-ranking cultivators came and went here like clouds, while powerful figures were as countless as flood dragons lurking in the abyss.
The reason it had fallen to its present state lay in the great battle a century ago.
After the Primal Devil Sect was destroyed, Blood Rogue was the first to make a move. He personally went to Dragon Abyss and forcefully slew a Nascent Soul True Person stationed there.
Though that battle had lasted only a very short time, its destructive force had been immense, nearly reducing over half of Dragon Abyss City to ruins.
Over the following century, the cultivators of the Ten Thousand Immortals Society had rebuilt it without pause, restoring it to its current state.
That was the habit of rogue cultivators—patching and mending wherever needed. They did not have the kind of overall planning possessed by top-tier great sects; they simply repaired whatever needed repairing.
Moreover, rebuilding a super-sized immortal city of this scale required at least a Fourth-Order formation grandmaster to oversee the whole endeavor!
There were plenty of rogue cultivators proficient in other arts, but when it came to formations, they were few and far between.
A Fourth-Order formation grandmaster?
At least for now, Luo Chen had never heard of such a figure among the rogue cultivators of the Northern Sea.
On top of that, the Three Great Rogue Cultivators leading the Ten Thousand Immortals Society ordinarily did not concern themselves with affairs at all. They showed their heads but never their tails, with only Moon Rogue