Lin An arrived at the core of the formation and immediately discerned its information.
The Nine Dragons Rotation Grand Formation, Immortal Rank, seals nine dragon souls within its array. When the array is activated, the nine dragon souls can be summoned to defend against enemies, and the nine dragons can also be fused together to unleash Immortal Rank combat power.
"Master, for some reason, this formation has suddenly encountered some problems. Please repair it as soon as possible," Shen Wang said.
Lin An took a deep breath and carefully examined the formation.
If the formation were completely damaged, he naturally wouldn't have the ability to repair it. However, the formation as a whole is still intact, with only some gaps, which he can easily repair.
But soon Lin An's lips twitched.
He could fix the defects, but there were simply too many—a total of three thousand problems.
Although these are minor issues that can be fixed with some time, the key problem is that the Sin Beast outside the city will begin their attack in just one month.
According to the information he obtained from Shen Wang, there are Immortal Realm beings among the Sin Beast outside the city.
Han Qingyun, the strongest city lord in the entire Azure Cloud City, is only at the Half-Step Immortal. If this formation cannot be repaired, Azure Cloud City will inevitably fall in a month.
"This isn't just a test of patience, it's a test of my endurance."
Lin An couldn't help but complain in his heart that unless he worked day and night like an ox or a horse, it would be absolutely impossible to repair the formation within a month.
"Don't worry, I'll take care of it," Lin An said.
Hearing this, Shen Wang breathed a sigh of relief. "If you need anything, Master, please don't hesitate to tell me."
Lin An nodded. Actually, he really wanted to find someone to help, but unfortunately, this was Immortal Rank formation, and he was the only Sovereign Rank formation master in the entire Azure Cloud City. Even if others came, they would be lucky if they didn't make things worse.
"This is a good opportunity to learn about Immortal Rank formations."
Lin An comforted himself in this way and immediately began to repair the formation.
The repair is a bit difficult, but not too difficult; it just takes time and requires patience.
During the repair process, Lin An also gained a considerable understanding of Immortal Rank formations.
"This formation must have been set up by that senior Li Yang. As expected of Immortal Rank formation, it is so ingenious."
"I've never seen these Dao of Formations runes before; they must have been created by Senior Li Yang himself."
"I saw quite a few Dao of Formations runes during the first level, but those runes were broken and I couldn't figure out their use. Now, I'm taking advantage of this array to learn something."
As Lin An repaired the formations, his understanding of array formations deepened.
"Hmm? What's the use of this rune?"
Suddenly, Lin An saw a rune.
This rune's primary function is to create illusions and can bewitch living beings, but this Nine Dragons Rotation Grand Formation does not have an illusionary effect.
"It must be some kind of formation effect that I'm unfamiliar with."
Lin An thought to himself, thankfully this rune did not affect the great formation.
Lin An then continued to repair the other formations, and time slowly passed. Lin An also discovered that some runes, while having no effect on the grand formation, did not offer any help either.
"Something's not right. If it were just four or five of these runes, it wouldn't be so bad. Perhaps Senior Li Yang, as Immortal Rank array master, has his own ideas, and it's normal that I can't understand them."
"But I've actually found more than thirty of these invalid runes."
Lin An frowned. They'd already found over thirty invalid runes on the first day; wouldn't they find thousands over a month?
What exactly is the purpose of these runes?
"And the second test will take a month, isn't that too long? Is there a way to pass the test quickly?"
"Or did Senior Li Yang deliberately leave these invalid runes behind, just to make me suspicious and waste my time?"
Many thoughts flashed through Lin An's mind, but in the end he decided to take another look.
"If we wait a few more days, perhaps there won't be so many invalid runes later."
Lin An continued repairing the formation after thinking about it.
Three days have passed in the blink of an eye.
Lin An looked at the dozen or so ineffective runes in front of him and fell silent.
Over the past three days, he has discovered over a hundred invalid runes.
These runes are all different, but their only common feature is that they do not help the Nine Dragons Rotation Grand Formation.
Looking at these runes, Lin An already had some guesses in his mind, but at this moment he also had some hesitation.
If he guesses wrong and wastes time, it means he won't be able to repair the Nine Dragons Rotation Grand Formation within a month, and he might fail this second test.
Although Li Yang did not say what would happen if he failed the test, he felt that he would likely lose the opportunity to obtain the Immortal inheritance.
After pondering for a while, Lin An gradually made up his mind.
Then, with a light tap of his fingertip, he peeled away the dozen or so runes in front of him that were ineffective against the Nine Dragons Rotation Grand Formation.
"If I'm really wrong, I can simply leave the Land of Inheritance and go back to focus on refining pills to improve my strength."
"As for the inheritance of Immortal formations, I should be able to become Immortal Rank formation master once I break through to the Immortal Realm."
Thinking this, Lin An disappeared and returned to the spot where he had previously repaired the array, where he peeled off all the runes.
Time passed little by little.
Lin An moved swiftly through the gaps in the formation, stripping away all the invalid runes he discovered.
It took Lin An three whole days to remove all the invalid runes.
There are a total of 7168.
Looking at these runes, Lin An's eyes flashed as he recalled the situation in the first level. He immediately began to arrange these runes into an array.
Another day passed, and Lin An suddenly smiled.
"I see."
Lin An left the formation and arrived at Azure Cloud City.
"Master Lin An, why are you out here? Is something wrong with the formation?" Shen Wang appeared beside him at this moment.
Lin An took out the runes he had extracted, then cupped his hands and said, "Senior, have I passed the second test?"
Shen Wang paused, then dropped the pretense and revealed himself to be Li Yang. "I didn't expect you to notice something amiss so quickly, young friend."
"It was just luck," Lin An said, shaking his head. He was only gambling himself.
"Young friend, you haven't passed the test yet," Li Yang said with a smile.
Lin An remained silent, his gaze fixed on the runes. With a wave of his hand, the runes rapidly combined, instantly transforming into a large array.
As the grand formation activated, streaks of light shot out, enveloping the entire Azure Cloud City.
Under the impact of these streams of light, the flaws in the Nine Dragons Rotation Grand Formation that Lin An had not repaired began to break, and then quickly spread to the entire array.
Boom...
Soon, accompanied by a deafening roar, the Nine Dragons Rotation Grand Formation shattered, the entire world froze, and the surrounding scenery vanished.
Lin An and Li Yang also returned to the void.