Bidding farewell to the old man, Zhao Xuan galloped down from the snow-capped mountain and once again stood in front of Canghui Castle. He took a deep look at the underground of Canghui Castle, and then returned to the southwest without looking back.

Under the Canghui Ancient Castle, directly below the endless dry bones, a somewhat damaged altar suddenly flashed with a faint black light after Zhao Xuan left.

A pitch-black mass of air escaped from the altar, burrowing through the impermeable soil towards the ground, and it seemed to have wisdom in one direction.

And deep underground, a murmur slowly came from the broken altar.

"It has not been born for thousands of years, is the world already so terrifying?"

The faint voice was like a dream whisper, with coldness and a hint of confusion, but it was buried deep underground, and no one could hear it.

Zhao Xuan did leave the scope of Canghui Academy, and after listening to the old man's words, he was very sure that the black gas was hiding here, although he didn't know what method the black gas used to avoid his divine sense detection, but since it could dodge, it meant that it was useless for him to continue to investigate.

But this time it can't be said that there is no harvest at all, according to the legend that the old man said, it is very likely that he will find out the origin of the black qi through other channels, and from its behavior of avoiding itself, it is still very jealous of itself.

And from all indications, the origin of this black gas is definitely not ordinary, it is very likely that this is not a mortal power at all, after all, it has existed for too long, and it has left its legend in the years thousands of years ago.

Zhao Xuan soon returned to Heaven Dou City, the process of the competition has been very smooth, and no one who is not open-minded will come out to make trouble at this time.

With the suppression of the three forces and the presence of several Titled Douluo, Heaven Dou City at this moment can be said to be the safest time, after all, the future of the soul master world is not just talk, the people who come to participate in the competition are the best among the young soul masters, if something happens to them, then the future of the soul master world will collapse by at least one-third, and the forces in charge of the event will also be discredited.

With doubts about that black qi, Zhao Xuan came to the largest library in Heaven Dou City, the Heaven Dou Royal Library.

The number of books in this collection is only a few million, which is not enough compared to the libraries that often collected tens of millions or hundreds of millions of books in the previous life, but it is one of the best libraries in this world.

Most of the materials and documents stored in it will be open to everyone for free, but others can only be entered if you have a soul master certificate or a scholar's certificate, and the master is also a frequent visitor here.

The huge library was extremely quiet, only the "rustle" of books, as if the hustle and bustle of the outside world did not affect it at all.

Zhao Xuan glanced at it cursoryly, perhaps under the influence of the Soul Master Competition, there are not many people here now, but most of the people sitting here reading books are polite scholars and some nobles with elegant movements, and it is rare to see civilians reading here, for most ordinary people, reading books is undoubtedly a boring thing.

Zhao Xuan couldn't help but slow down, and then slowly walked towards the historical area.

In the afternoon, Zhao Xuan was immersed in the sea of books and flipped through the materials, he flipped through the books very quickly, but he could finish a book in a few tens of seconds, and the divine sense would read the words in the book, and finally extract useful information.

Zhao Xuan was able to control his movements very well and not let himself make noise to disturb others, so even though he had flipped through hundreds of books in one afternoon, no one noticed this remote corner.

When it was approaching evening, Zhao Xuan stopped what he was doing and began to go back towards Shrek Academy, but looking at his expression, it seemed that he had gained a lot.

When he returned to the academy, Zhao Xuan unexpectedly met the master on campus, and the master looked down at the information of the various colleges participating in the competition, and was slightly stunned when he noticed Zhao Xuan's footsteps.

He glanced up at Zhao Xuan, and then said with a smile: "Come and sit down for a while." ”

The master sat under a somewhat tall tree, what is the name of this tree Zhao Xuan didn't know very well, its trunk was very similar to the Yellow Horn Tree in his previous life, but its leaves were very narrow and thin.

"Master, how is the battle going today?"

Zhao Xuan walked over and sat next to the master, glanced at the various materials and data in his hand, and couldn't help asking.

"It's not bad, today's opponent is Tianhuo Academy, and we won."

The master's expression looked very flat, but Zhao Xuan heard a hint of relief from it, after all, all the students of the Shrek team were trained by him.

"That's good."

Zhao Xuan said with a light smile, although with his current strength, this continent-wide Advanced Soul Master Academy Elite Competition was like a child playing at home in his eyes, but he was still quite happy that his partner could achieve excellent results in it.

"Zhao Xuan, where have you been today?" The master looked at the information and asked as if unconsciously.

Zhao Xuan was slightly stunned, he didn't hide it after glancing at the master, and chuckled: "Go chase the trail of that strange black qi." ”

Although it is not unreasonable for Flender to love you yesterday, the weirdness of this black gas has always floated above the heads of Shrek and everyone like a dark cloud, although everyone did not say it explicitly, but Zhao Xuan still faintly felt this way.

After all, it is too weird, too mysterious, and humans will always feel uncomfortable about this unknown thing.

And Zhao Xuan has been missing for two days, the master must also understand where he is, after all, the master is the first person in the theoretical world, although the strength is not good, but the wisdom is enough to be proud, if he can't guess this, then this name is too unworthy of the name.

Sure enough, the moment the master heard this, he raised his head and looked at Zhao Xuan, and asked with blazing eyes, "Have you gained anything?" ”

Zhao Xuan nodded, and then recounted what he had gained from this line.

"Canghui Academy?"

The master glanced at Zhao Xuan in some surprise, and then said with some emotion.

"I was negligent about this, I didn't expect you to find out."

Zhao Xuan smiled: "After all, I not only have to rely on my strength to eat, but also rely on my brain to eat." ”

The master was dumbfounded, and while looking at Zhao Xuan with some amusement, he suddenly felt a little pity in his heart. If he pestered Zhao Xuan to make him his apprentice, then his achievements in theoretical research in the future would definitely be much better than himself.

But after thinking about it, the master's expression suddenly became a little silent, what's the use of theory, what the world looks at is strength after all......

(End of chapter)