Originally, he thought that the Holy King's prison was full of heinous demons and rebels, but he didn't want to check it out, and Chang Feng completely overturned this idea.

In the thirty-sixth cave, Chang Feng found a book room, in which there were no skeletons or traces of any remaining creatures, some were just a room full of scriptures, exercises and spells, and even supernatural cultivation techniques.

In the room, there are still many traces of paper scattered on the ground and writing, drawing, and painting, which are very clear and obvious traces of participating in the exercises.

It is very conspicuous that the person imprisoned in this cave prison must be a master who is proficient in the study of the exercises, and even this master has complete freedom of entry and exit.

Chang Feng has no time to guess those unknowable pasts, and directly collects all the exercises in the house, compared with those treasures and resources, the exercises books in the entire cave house are priceless, not to mention that there is absolutely no broken exercises that appear here, leaving them for future research, can play an unimaginable role.

Continuing to explore, Chang Feng made a discovery, but when he arrived at the sixty-seventh and sixty-eighth caves, they were connected together.

After some checking, Chang Feng could determine that the two connected caves were a place to study the Danfa.

Six corpses were found in the two places, one for the Cave Heaven Realm human cultivator, one for the Blessed Land Realm human cultivator, and four mortal cultivators at the god level.

Obviously, those two immortal cultivators of the Three Realms were the ones who presided over the alchemy, and as for the mortal cultivators of the four god levels, they should be their assistants.

In addition, a bronze Dan furnace was found in Cave No. 67, and in Cave No. 68, some classics recorded in alchemy and paper and pen for participating in the study of classics were found.

But thinking about it, Chang Feng also understood, this is the Holy King's Prison, and the imprisoned must be a grandmaster-level alchemy master, and there will definitely be a special person to supervise it, what pills to refine and what materials to give, Cheng Dan will take it away immediately, and naturally nothing will be left.

Rao is like this, Chang Feng has also gained a lot here, not to mention those classics that record the art of alchemy, even the bronze Dan furnace exceeded his expectations.

"Heaven-level magic weapon, this Dan furnace turned out to be a heaven-level magic weapon!" After some research and conclusion, Chang Feng was already extremely happy in his heart.

Although he was not proficient in the method of alchemy, and he did not stop alchemy, he understood the usefulness of such a special alchemy Heavenly Rank magic weapon and the value of a room full of pill books.

With these, as long as you go out, you can definitely create a powerful pill force in an extreme time.

Without thinking too much, Chang Feng directly took away all the Dan furnace and Dan medicine classics.

Suppressing the excitement in his heart, Chang Feng continued to move forward, and after another series of gains, his mood was unprecedentedly high.

"This is the Saint King's Prison! Is this clearly a treasure mountain of immeasurable value? I really don't know what that Demon Spirit Heaven thinks, could it be that his head is broken?"

In addition to the excitement in his heart, Chang Feng only cared about collecting the treasures, but forgot that he was now in prison and whether he could get out was still unknown.

Moving on, Chang Feng made a bigger discovery.

This time, he discovered a very special cave.

Regardless of whether there were people imprisoned in the prison caves he had checked, the immortal yuan qi was extremely thin, even in those prison caves where the pills were refined, but in the eighty-second prison cave mansion, it was full of immortal yuan qi.

In this prison cave, there are more than 30 immortal-level vegetation planted in pots, and all of them are seedlings, among which there are many innate spiritual roots that are rare in heaven and earth, such as ice jade dates, Bodhi trees, pure god bamboos, and flame peaches...... There are also many immortal plants that Chang Feng doesn't know, and each one is enough to trigger the scramble of the entire immortal cultivation world.

Although subject to the rules of heaven and earth, whether it is the ten innate spirit roots of the human race or the innate spirit roots that the demon race has discovered, there is only one mother plant, and only the one above the mother plant can grow into an innate spirit treasure, but this does not mean that the daughter plant of the innate spirit root is not of great value.

In fact, each sub-plant of the Innate Spirit Root was of great value, and many cultivators of the Three Realms of Immortals could not ask for one.

But there are more than 30 such immortal plants in front of him, and the most important thing is that Chang Feng doesn't know if they have the potential to grow into mother plants?

However, compared to these immortal plants, Chang Feng's gaze was attracted by some milky white stones placed around the immortal plants.

Almost every immortal plant had three to five of those milky white stones around it, and Chang Feng was completely sure that the rich immortal yuan qi in this cave must come from those stones, but there was also a kind of heaven and earth origin power in the immortal yuan qi, just like the power he felt in the Muyuan Venerable.

"Could it be that the existence of Heaven and Earth Spirit Milk is refined? No, this is definitely not Heaven and Earth Spirit Milk. Chang Feng guessed in his heart, but when his eyes moved, he saw dozens of lines of handwriting on a stone wall in the cave.

The front is written about the varieties of immortal plants in the prison cave, among which there are the names of the immortal plants he knows, and behind the immortal plants are some numbers, ranging from three, four, and five, which obviously record the number of those milky white stones.

And on these numbers is the name of a resource: Heaven and Earth Source Stone.

Obviously, what was recorded on this wall was the number of Heavenly Earth Source Stones needed to cultivate these immortal plant seedlings.

"Heaven and Earth Source Stone, it seems that this is the name of these milky white stones. Chang Feng was sure in his heart, no longer having any superfluous thoughts, his mind moved, and dozens of immortal plants and heaven and earth origin stones all entered his private secret realm.

In order not to affect the growth of those immortal plants, Chang Feng even placed the Heaven and Earth Source Stone around those immortal plants as they were.

Suppressing the excitement in his heart, just as he was about to leave this cave, he found that there was a separate room in this cave, which was different from other caves.

Entering the room, what greeted me was a room full of heaven and earth source stones, roughly no less than a thousand pieces, and in the middle of the house was a small verdant tree more than a foot high.

The branches and leaves of the small tree were green, and the root system grew on the source stone of heaven and earth.

"It's so similar to that big tree, could it be that Venerable Muyuan is a tree spirit!" Looking at the small tree in front of him, Chang Feng seemed to see the big tree where Venerable Muyuan was, and he guessed in his heart.

"No matter what, this little tree must be extraordinary, I'm afraid it is more valuable than those heaven and earth spirit roots just now, and when he finds the Muyuan Venerable, he will definitely be able to solve this question. ”

Although he couldn't bear to recognize the little tree, he had a plan in his heart, and Chang Feng included it in the secret realm of his private belonging, and he was the same, even if he knew that the value of the Heavenly Earth Source Stone was huge, he didn't move a piece.

Finally, after inquiring about this cave, Chang Feng, who never found it again, left and walked to the next cave prison.

Leaving the cave with the Heaven and Earth Source Stone, Chang Feng, who was full of excitement, continued to check, and although he did not encounter a special cell like the Pill Cell, the Classic Cell, and the Immortal Plant Cell, he had already gained a lot.

The skeleton of the Cave Heaven Realm Immortals, the Blessed Land Immortals, and the Cave Heaven Secret Realm Bead Blessed Land Secret Realm have gained a lot, and there are more than a dozen of them, still with a strong demonic aura and monstrous bloody aura, which are no worse than the fierce Venerables they have encountered, obviously they are all some old demons and violent cultivators in front of them.

Only at this time did Chang Feng feel that this was a prison used to punish prisoners.

Half a day later, when Chang Feng finished checking all the prison caves on the first floor, he made a rough calculation in his heart:

There is a heaven-level magic treasure pill furnace, a pill book, and countless immortal-level martial arts books; an unknown small tree, thirty-eight innate spiritual root seedlings, and thousands of heaven and earth source stones; thirty-seven skeletons in the Cave Heaven Realm, of which fifteen are demon clans, twenty-two are human races, five skeletons in the blessed land realm, only one human race, and the remaining four are all demon clans, and as for the corresponding secret realm beads, there is no shortage of one.

After calculating, Chang Feng couldn't hide his ecstasy in his heart, and shouted directly to the sky: "Prison Mountain, Prison Mountain, this is the place of prison, this is clearly a treasure mountain!"