"Moreover, if you can accumulate enough merits in the Jade Yin Ghost Realm, you can also exchange this soul essence, as well as the immortal demon soul."

Ye Chen pointed to the top few items of the exchange list written on the other side of the dark stone pillar, even he was a little moved.

Soul essence is the purest soul essence left after being milled by the power of reincarnation, and it can be fused with the soul of a powerful user without any sequelae at all, although the more you use it, the worse the effect, but this thing has no limit to use, and it can theoretically be infinitely strengthened.

As for the undead demon soul, this thing is the immortal god soul, but it is an untransformed immortal god soul.

In some places where soul power gathers in the depths of the underworld, under some special circumstances, the undead demon soul will be born, which is extremely evil and brutal, and can devour other souls infinitely.

When the Demon Soul devours enough soul body to become strong enough to a certain extent, it will begin to transform into an even more powerful undead Demon Soul.

However, there is a special circumstance, the demon soul will have a mutation in the transformation, and all the evil thoughts such as evil and cruelty in the demon soul will be transformed, leaving only the purest good thought divine soul, that is, the extremely rare immortal divine soul in the underworld.

Immortal demon souls also have the talent of immortality, and they can be used to refine into powerful ghosts, but they cannot be sacrificed to the spirit ghosts.

It can't be said that you can't sacrifice your own life spirit ghost, but if you use the immortal demon soul to sacrifice this life spirit ghost, the cultivator will be infected by the pure evil thoughts in the demon soul, and become extremely evil and brutal, and it will greatly reduce your mind, this last point is the most critical and fatal.

Although it cannot be sacrificed to the life spirit ghost, this immortal demon soul is still a very rare and precious ghost thing, and many ghost cultivators, even those who have cultivated to the level of ghosts and immortals, like to use it to refine the Dharma Protector Divine Envoy.

According to what is written above, it takes 1,000 merit points to exchange a unit of soul essence, a full 5,000 merit points to exchange an undead demon soul, and a little merit requires killing at least ten ghost generals, or 1,000 ghost soldiers.

In this world, the strength of ghosts and monsters is divided from low to high, which are six levels: small ghosts, big ghosts, fierce ghosts, ghost kings, ghost fairies, and ghosts and gods.

The little ghost has the lowest strength, whether it is a newly formed ghost or an old ghost who has lived for hundreds of years, as long as he has not survived the first heavenly tribulation, he can only be regarded as a little ghost.

The big ghost has generally survived the first heavenly tribulation, and is in the middle of the second heavenly tribulation, corresponding to the human race cultivation system, which is equivalent to a sword immortal, and is also a first-class senior ghost soldier in the Yuyin ghost world.

Fierce ghosts are also called old ghosts, all of them are powerful ghosts that have lived for hundreds or thousands of years, they have survived the unique ghost tribulation of ghosts, and their strength is comparable to the first-class scattered immortals, and they are also equivalent to the four-star level in the Tower of Eternity, and they can already command many ghost soldiers in the Yuyin ghost world and even other ghost worlds, and they are called ghost generals.

As for the Ghost King, it is equivalent to the Earth Immortal level of the human cultivation system, and they all gather a large group of evil ghosts to roar in the underworld, and they are the overlords of the earth.

As for the ghost immortals, the immortals who are already officially equivalent to the six-star primordial god level are more powerful than the ordinary primordial gods in the ghost domain, but the power of the ghost immortals' heavenly tribulation is extraordinarily large, so the number of ghosts and immortals is exceptionally small.

That is to say, you have to kill at least ten ghost generals at the level of scattered immortals, or a thousand ghost soldiers and ghost pawns to get a little merit, if you want to make up a thousand meritorious deeds, you have to kill the ghost generals equivalent to 10,000 scattered immortals, which is difficult...

At first, Ye Chen was puzzled that the Jade Yin Ghost Realm was so big, where did so many ghost soldiers and ghosts come from, but when two days later, a large number of their human ghosts were driven into a teleportation array and teleported to another place, he knew that the strength of the Jade Yin Ghost Realm was not what he imagined at all.

The teleportation array teleported directly to the underworld, and when the barrier formed by the space distortion disappeared, the pure yin qi that rolled in from the breath casually, the thick dark clouds of the heavenly firmament, the yin wind that stinged the soul in defiance of the flesh, and the army of death on the vast and boundless earth with no boundary, all proved that they had come to one of the most mysterious places in the heavens and all worlds—the underworld.

They were teleported directly to the rear of a huge barracks, and when they came down from the portal with a group of teleporters, a half-human, half-beast general with black bone spurs all over his body came to them, shouting:

"You, it's you, come with me, the trespasser will die!"

Ye Chen and the four of them glanced at each other and followed silently.

A group of about thousands of people passed through several barracks and came to a huge barracks, which was already sparse and sparse with only a few hundred people, which was completely incomparable with tens of thousands of people in other barracks, and all of them were wounded, and some of them were missing arms and legs.

Led them into the barracks, the remaining hundreds of ghost pawns in the barracks surrounded them, and the fierce aura formed after a hundred battles made the mortals in the team tremble, even the four of them had solemn expressions.

At this time, the ghost who brought them over stood on the black platform made of stone or black iron, his eyes widened, and a fierce aura came to his face, and he shouted in a deep voice:

"From now on, you are the soldiers under this general, those who do not obey orders will die, those who retreat from the battle will die, and those who desert on the battlefield will die!"

Three dead words in a row were like thunder, not only ordinary mortals trembled and did not dare to speak, but even the few dozen monks in this group were silent and did not dare to come forward.

Then the ghost general said:

"Now, there are Dao cultivators to my left!"

There was a commotion in the team, and after a while, a black-robed skeleton with bones like black jade was the first to walk out, some people took the lead, and some people went out one after another, Ye Chen thought for a while, and said to the three of them:

"It seems that this is to distinguish us from ordinary people, there should be differential treatment, let's go out too."

After speaking, the first one walked out, and Ye Lianxing, the bitter monk and the Qingyun Guan Master walked out behind him.

In order to reduce the trouble, when they entered the Yuyin Ghost City, they changed their outfits, he directly changed into a cyan robe, the bitter monk changed into a cyan monk's robe, the Qingyun Guan Lord changed into a gray robe, and even Ye Lianxing changed the beautiful skirt into an ordinary cyan skirt, although the natural beauty is difficult to hide, but it is not as conspicuous as before.

After about five minutes, no one came out of the ranks, and the half-human, half-beast ghost general said to the mortal phalanx below:

"From today on, you will be soldiers of the Ninth Brigade of the 37th Army of my Jade Yin Ghost Realm, and you will have a month of training, and you will serve Yuyin Niangniang in a month."

After speaking, he signaled to the dozen or so ghosts standing under the stage, and more than a dozen elementary school schools stepped forward and shouted loudly to start the training.