The last time Cheng Yu returned to the Forest of Death, he found other corpses in each of the five shrines. These corpses include immortal white bones and demon corpses.

All the corpses of the five major shrines combined exceeded twenty thousand, especially the last Tongtian Shrine, because it was probably the main battlefield that year.

However, at present, Cheng Yu has only found these two kinds of corpses, which means that the enemies of the Holy City are from the fairy world and the demon world. However, Cheng Yu believed that the enemies of the Holy City were far more than that.

It's just that Cheng Yu hasn't found another clue yet, and there is no way to prove other enemies.

Among the more than 20,000 corpses, the immortal white bones and the demon corpses basically accounted for half of each other, and the difference was not big.

With so many corpses, Cheng Yu naturally couldn't waste them. Especially since these corpses are not ordinary corpses, they are very useful.

And now, Cheng Yu plans to use these corpses, but before that, he needs to learn a formation first, this formation is the Heaven and Earth Yin Yang Ancient Returning Heaven Formation.

This is a formation that Cheng Yu has remembered in his heart for a long time, and now Cheng Yu is in the late stage of integration, and all the formations in the Immortal Demon Tower have been opened.

And when Cheng Yu was studying various formations, he noticed this special formation, because this formation required a total of nine hundred and eighty-one runes.

Of course, eighty-one runes were not the formation with the largest number of runes that the Immortal Demon Tower could compose, and in the current situation that Cheng Yu knew, ninety-nine runes should be the formation with the highest number of runes that he could combine now.

As for whether he will be able to break through a hundred in the future, he will only know after the Immortal Demon Tower gives him such a hint.

However, even if there were only eighty-one runes, the power must already be very strong. Because Cheng Yu has used the most powerful formation so far is the previous Binding Realm Array, with a total of seven seven and forty-nine runes.

But now, he had already opened all the formations, especially since he had long been fond of this Heaven and Earth Yin and Yang Ancient Heaven Returning Formation. So when he learned this formation, he was already groping.

Although the formation of the Immortal Demon Tower has been fully activated, it is not something that Cheng Yu can use directly, and it also needs to be learned. It's just that this kind of learning is much easier than Cheng Yu to crack the formation, because he only needs to use the Immortal Demon Tower to be able to perform it.

And Cheng Yu cracked those formations just to get these formations out of the Immortal Demon Tower, which was naturally much more complicated.

Of course, there is naturally no need for him to break away from the Immortal Demon Tower, and there is no need to spend that time to crack it, as long as he learns it, he can directly use the Immortal Demon Tower to cast it.

However, the ninety-nine eighty-one runes are not a joke, if you want to learn this formation, even if you have an immortal demon tower, you still need to study it carefully.

Moreover, this formation is amazing, it can make those corpses in Cheng Yu's hands become living people, that is, bring those corpses back to life.

Of course, this resurrection of the dead is not to restore these white bones to the flesh, and the dead back then will be resurrected again. Rather, it exists in another form of resurrection, which refers to the transformation from dead to alive, which was originally dead and now only makes him alive, not human again.

In other words, through this formation, Cheng Yu can turn these people into the living dead.

However, Cheng Yu doesn't need them to grow into flesh, what he wants is these living dead. Of course, the living dead controlled by this formation are not ordinary living dead, and they are able to regain some consciousness.

As for the extent to which these living dead can recover, Cheng Yu himself does not know at present, and he will only know after he thoroughly learns this formation and tries it.

Although Cheng Yu has already begun to learn this formation, judging from the current situation, it may take some time. It's just that Ning Wushuang's poison can't be solved for a day, Cheng Yu's heart can't be relieved, he needs to learn this formation as soon as possible.

In addition, he also needed this formation to help him get rid of the dynasty's suspicion of Cheng Yu's identity.

——

After studying the formation for a night, Cheng Yu naturally gained a lot, but there was still some time before success.

When Cheng Yu woke up, everyone had been waiting outside Cheng Yu's door for a long time.

"Senior Brother Yu, where are we going now?Do you want to go to the Heavenly Gate to see?" As soon as everyone walked into Yu's room, Xinluo couldn't wait to ask.

"No need, let's go find the Yang Mirror now, right?" Cheng Yu shook his head and said.

Now, Tianmen can't go back easily, and it is very likely that there will be an ambush in the dynasty. Besides, now that the gods are no longer in the Heavenly Gate, and the poisonous immortals are not in the Heavenly Gate, there is no point in them going to the Heavenly Gate itself.

"But what about the frostless poison, she's getting worse and worse now!" asked Lanya.

"Yes, since the Poison Immortal is not in the Heavenly Gate, then we can find it somewhere else!" several women also said.

"There's no way for the time being, I've already asked the old man surnamed Xu, the poison immortal is just a front for this guy. The true identity of the Poison Immortal is the Poison Elder of the Dynasty, so it is impossible for us to find him to help Wushuang detoxify!" Cheng Yu said helplessly.

"What??The Poison Immortal is the Poison Elder of the Dynasty?" everyone was taken aback, they obviously didn't expect the result to be like this.

"Damn, this old guy dares to lie to us, what's the point of him doing this? Now that we know the truth, Senior Brother Yu, you won't kill him, right?" Xinluo asked.

"Naturally, I won't kill him now, he just wants someone from the dynasty to save him. Because the Heavenly Gate was destroyed by the dynasty, not the Xuantian Sect!" Cheng Yu broke the news again.

"Dynasty, they're also going for that artifact?"

"That's right, it turned out that another team of Tianmen disciples was met by the Fang family, and their Fang family used this news in exchange for the support of the dynasty. And when the dynasty got the news, they directly destroyed the gate of heaven for this divine object!

As for why this old guy surnamed Xu lied to us, he just thought that the people of the dynasty would come to Tianmen, and if we appeared at Tianmen, the dynasty would naturally rescue him. But it's a pity that the news of the destruction of Tianmen was known to us in advance, and his wish naturally came to naught!" Cheng Yu said.

"So that's the case, this guy has a good calculation, but it's a pity that people are not as good as heaven. He wants the people of the dynasty to save him, and he will not think about it in this life!" Everyone suddenly realized.

"If that's the case, wouldn't there be no way to cure the frostless poison?" said Xinmei.

"That's right, the Poison Immortal is the only person who has the potential to find a thousand kinds of toxins, and now even he is a member of the dynasty, how can this poison be solved?" Everyone was helpless, and even the last bit of hope was shattered!