Now there is only one way to increase your strength, and that is to refine the Twelve Yin Spirit Ancient Demons.

The cultivation of the Twelve Yin Spirit Ancient Demons required absorbing a large amount of dark power.

The higher the energy, the more terrifying the power will be when you are promoted.

So Yang Fan thought of a place, and there was an underground abyss over there.

The underground abyss is located in an ancient mountain forest five hundred miles north of Qianyang City in the Great Qian Empire.

That mountain forest is very terrifying, and there are terrifying brute beasts.

Of course, this is not the most terrifying place, the most terrifying thing is that there is a place in the mountain forest that connects to the underground world.

That hub is the underground abyss.

The Underground Abyss is one of the entrances to the Underworld.

There are often powerful earth demons, and sometimes even powerful demons descend and enter the human world from the underground abyss.

There are thirty-six floors in the Underworld.

Each layer of the underground world contains endless resources, but the underground world is occupied by demons, demons and evil ways, and the power of righteous people in it is very weak.

Even the demon kingdoms established by the major demonic forces are in the thirty-six layers of the underground world.

The demon kingdom is the capital of the devil.

There is the Demon Dao Prince Group in power, and the old monster Yang Fan saw in the 100,000 mountains is a member of the Prince Group, and his cultivation is unfathomable.

The underground abyss is the entrance, so it is very dangerous, but the underground abyss is also the place where the dark power of the underground world "floats out", and it has plenty of dark power.

If Yang Fan was able to refine the Twelve Yin Spirit Ancient Demons in it, the Twelve Yin Spirit Ancient Demons would inevitably grow extremely fast.

Wealth and danger are sought.

Yang Fan is now eager to improve his cultivation in his heart.

Only by elevating one's cultivation to the next level can one be qualified to gain a foothold in the Qingyang Sect.

Otherwise, it's just ants, slandered and killed casually.

Yang Fan wore the armor of the Dao soldier, turned into wings, and flew towards the underground abyss.

Yang Fan was not idle along the way, hunting demons while advancing, killing thousands of heads along the way.

Yang Fan's results are definitely among the best, this time Yang Fan has already heard that the top 100 disciples who hunt demons will be directly promoted to the inner disciples, and the top 100 disciples will also be eligible to participate in the Dragon and Tiger List Competition half a year later.

The first place is eligible to enter the small world of Xu Yu to cultivate.

Yang Fan has some understanding of the small Qiankun mirror, and it is said that it is connected to the fairy realm, and there is an immortal qi falling.

Although immortal qi is not something that mortals can refine at all, immortal qi will change the energy structure of the small world, where the energy is extremely noble.

Moreover, the law of time has been cast by the supreme power in the small world, and one day inside is equivalent to ten days outside.

Coupled with the fact that the energy contained in it far exceeded that of the outside world, one day of cultivation in the small world was equivalent to thirty days of cultivation outside.

If you practice in it for three months, it is almost equivalent to ten years of penance outside.

What Yang Fan lacks most now is time.

Ten more years to the sky..................

Yang Fan wants to seize this opportunity to improve his cultivation and ascend to the sky in one step.

Flying all the way, it didn't take long for Yang Fan to come to the entrance of the underground abyss.

The underground abyss is stretched for I don't know how many miles, and I don't know how many miles wide, and I can't see where the end is.

Endless demonic mist rolled in it, and the sinister aura permeated it, which was extremely terrifying, and there were even countless lonely souls and wild ghosts floating in the abyss.

Yang Fan knew that in the thirty-six underground world, there were countless monsters, brute beasts, as well as fierce demons, masters of the Demon Dao, etc., and the killing was very large.

In the underground world, the survival rules of the strong are respected, and the survival of the fittest is deduced, and I don't know how many powerful demons, monsters, and so on die every day.

The resentment, death, and so on of the dead beings will be condensed together to form a yin and evil qi.

This evil aura is extremely terrifying, it is a terrifying dark power, mortals will die immediately if they touch it.

Even if a cultivator is exposed to the evil qi and is invaded into the body, he will gradually turn into a monster.

The best nourishment for the Twelve Yin Spirit Ancient Demons is to die of the Yin and Evil Qi.

The Yin and Evil Qi is divided into eighteen grades from low to high, but the Yin and Evil Qi in this Demon Abyss is also the first grade of Yin and Evil Qi, and it is the lowest level of Yin and Evil Qi.

Yang Fan entered the underground demon abyss, looking cautious.

He felt that there was a yin aura enveloping his whole body, as if it was about to forcibly invade his body and destroy his vitality.

However, as soon as the Twelve Yin Spirit Ancient Demons moved slightly, those Yin Qi were absorbed.

After entering this underground abyss, Yang Fan suddenly felt that the Twelve Yin Spirit Ancient Demons seemed to emit an extremely excited thought.

The Twelve Yin Spirit Ancient Demons have a preliminary meaning, but it is not complete, this is the first time that the idea has been issued.

Obviously, the Twelve Yin Spirit Ancient Demons were extremely eager to absorb the Yin Qi Qi of the Evil Spirits.

This is the supply of the Twelve Yin Spirit Ancient Demons.

The higher the Yin Qi absorbed, the higher their cultivation will be.

Yang Fan went all the way deep and found a Jedi, he sat in a circle, and began to absorb the yin aura of this underground abyss.

The place where he was located belonged to the first layer of the underground world, boundless and vast.

In some special places, it is the place to enter the next layer, and the evil aura of that place is even stronger.

However, Yang Fan didn't dare to look for it, that kind of place was often guarded by powerful demons, and he was looking for death when he went.

Even even the underground layer has a lot of powerful demons, countless demon legends spread in the land of Kyushu, such as some demon gods, demon lords, etc., have established their own bases in the underground world, mining all kinds of resources.

Yang Fan began to operate the Heaven Devouring Divine Skill, and the Twelve Yin Spirit Ancient Demons were suspended around his body, absorbing the Yin Qi of this underground layer with all his might.

Boom~~~~ The boundless yin and evil qi surged, and a black hole appeared above each Yin Spirit Ancient Demon, and the black hole began to frantically absorb the Yin and evil qi, rolling the Yin and evil qi into the body, and the cultivation of the twelve Yin Spirit Ancient Demons was rising steadily.

Their strength, which was originally two thousand stones, began to grow at this moment.

Two thousand three hundred stones.

Two thousand five hundred stones.

Three thousand stones.

It rose to 3,000 stone before it stopped.

The Twelve Yin Spirit Ancient Demons could no longer absorb the Yin Qi of Yin Evil.

Because it is already saturated, it needs to precipitate for a period of time, and the quality of the first-grade Yin and Evil Qi is too low-level, and it can no longer meet the needs of the Twelve Yin Spirit Ancient Demons, unless it absorbs a higher grade of Yin and Evil Qi to be able to improve again.

However, the yin and evil qi above the second grade are all in the second underground world or even lower, with Yang Fan's current cultivation is not enough to enter, Yang Fan has no choice, only to slowly hibernat, wait until the cultivation is profound, and then enter the underground world for a new transformation.

However, now the cultivation of the twelve Yin Spirit Ancient Demons has also been upgraded to a higher level, each of them has the power of three thousand stones, and the twelve are thirty-six thousand stones, plus the power of the thirty thousand stones that Yang Fan himself has, Yang Fan's strength at this moment is even comparable to that of the Nine Heavens of the Martial Master Realm.

The only difference is the purity of true qi, the perception of the realm, and the use of power.

Cultivating for Dajin, Yang Fan was overjoyed in his heart, and he didn't want to stay here for a long time, he planned to leave.

But at this time, Yang Fan saw that in the depths of the underground world, boundless blood clouds covered the sky, and a terrifying aura permeated the heavens and the earth.

Under that blood cloud, there seems to be an extremely terrifying existence, as if pregnant with a world-famous demon fetus, an invincible demon god.

"What is it?" Yang Fan's face suddenly changed.

He rushed forward quickly, and it didn't take long for him to reach his destination.

It was a valley, and many demons gathered in the valley, and boxes of things were carried out, and those things turned out to be spirit stones.

Those spirit stones were all thrown into a deep pit, and the flames in the deep pit were burning, it was an extremely terrifying earth fire, called "Earth Center Fire", which existed in the Earth Center World of the thirty-six underground worlds, even the ancient king-level powerhouses could not go deep, otherwise they would be melted immediately.

The boxes of spirit stones were thrown into the fire of the center of the earth, burning fiercely, instantly turning into rolling power, and being refined by the fire of the center of the earth.

And above the fire in the center of the earth turned out to be an altar.

On top of the altar is a large cocoon.

The giant cocoon was more than ten feet high, and it seemed to be pregnant with an invincible demon fetus.

The giant cocoon was constantly absorbing the power of the spirit stones refined by the fire in the center of the earth.

"What is that?" Yang Fan's face changed, and he felt a terrifying aura from the giant egg.

"Whoosh~~~~~~~~~" At this time, a mysterious woman flew over and apparently saw Yang Fan from Taniguchi.

She descended in an instant.