After doing all this, he sat down silently and began to learn the knowledge about the formation in his mind. Because he didn't know if the big eagle outside would come back, not to mention, there was nothing more suitable for him to perceive than here.

The levels of the formation are divided into one to nine ranks, and the grades of the corresponding array mages are also divided into one to nine ranks. There are relatively few mages in the continental middle formation, one is that it is more difficult to learn, and the requirements for monks are extremely high, and the other reason is that it is difficult to break through to the supreme grade, and most monks are stuck below the fourth rank and it is difficult to improve.

Xin Chengyu didn't know this yet, he was digesting this strange knowledge, and he didn't even look at what was in the ring.

On the other side, after Yu Wushuang opened up the eight veins of the Qi Sutra, his whole body was sublimated. She is even more independent in absorbing the aura of heaven and earth, which is equivalent to cultivating all the time, which makes her extremely satisfied. Her own strength has also been strengthened a lot, and she doesn't know how strong she is now, so find an opponent to test it, Yu Wushuang thought so.

After a day and a night, Yu Wushuang gradually compressed the spiritual power in his body and began to impact the bottle wall of the Jindan stage!

But it was difficult to break through several times in a row, and she always felt that something was missing and restricting herself.

No longer tangled, she walked to the pile of books full of exercises.

"This ...... Is it the experience of sword dozi alchemy? It's so detailed!" Yu Wushuang looked at the dense words on this scroll, many of them even had his annotations, although Yu Wushuang didn't understand, but when he saw such a careful alchemy experience, he couldn't help but be a little admired.

"If my prediction is correct, this sword path should have reached the stage of incarnation before his death. Xuan Lao said in a deep voice.

"Oh, how did you know?" Yu Wushuang wondered.

"Hehe, you don't know. Xuan Lao stroked his illusory white beard and said.

"I didn't expect Xuan Lao to be appetizing. Yu Wushuang joked.

"Ahem, why can't I! Why, do you have an opinion about the old man?" Xuan's old white beard exploded.

Yu Wushuang suddenly felt that Xuan Lao was also a little cute, and said with a smile: "How dare I, you can say what you want, if you don't say it, I can check it myself." ”

"Hmph, that sword path can directly see the existence of the old man with just a wisp of divine sense, and he has also stepped out of his own way, which cannot be done without the cultivation of the god transformation period. Xuan Lao continued to stroke his white beard again.

"Oh~" Yu Wushuang replied with a long sigh, looking at Xuan Lao's hard mouth, it was quite funny, but she also guessed one or two for this reason, so she didn't feel too surprised.

"Hmph, you little ghost, playing old man?!"

"Huh, there's a hidden cultivation book!" Yu Wushuang interrupted in time.

"This is normal, there are all kinds of exercises in this world, and even you can create your own exercises and spread them through the ages. Xuan Lao said with some indignation.