Half a year later, Lu Chen found the secret realm according to the clues left by the original owner of the jade pendant, which is a lake with a radius of hundreds of miles, called the Black Dragon Lake, it is rumored that countless thousands of years ago, there was a black dragon who flew to the spiritual realm after the success of the robbery, and later the human monks established a city not far from this lake, and people habitually called it the Black Dragon City, which continues to this day.

As the birthplace of the ninth-order demon beasts, countless monks have come here to look for opportunities, but when they enter the mysterious Black Dragon Lake, there will be bursts of dragon groans in the lake, and most of the monks who enter the lake have died here, and even many monks in the Transformation Stage have fallen, so, gradually, this place has become a forbidden place, and no one in the mortal realm dares to explore this Black Dragon Lake anymore.

When approaching the lake, Lu Chen had signs in his heart, sensing a deadly threat, he quickly retreated, and sure enough, a dragon groan sounded, Lu Chen was shocked and dizzy, and his six senses disappeared in an instant, and his body retreated dozens of feet.

Only then did Lu Chen realize that the dragon chant just now contained a terrifying soul attack.

"Long Yin, is there still a dragon in the Black Dragon Lake?"

The soul attack from Long Yin was too terrifying, and even now, there was still a trace of "buzzing" in Lu Chen's mind.

He took out a few rejuvenating pills from the storage ring and took them, and after half a day, Lu Chen returned to his peak state.

Lu Chen walked towards the Black Dragon Lake again, this time he summoned the Green Scale Demon Python from the storage ring, Lu Chen faintly felt that the Black Dragon Lake and his party might also be the opportunity of the Green Scale Demon Python.

The huge body of the blue-scaled demon python plunged into the lake, setting off countless waves, and the next moment, the terrifying dragon groan appeared again.

A black dragon phantom appeared in the blue lake, about twenty zhang in size, seeing that his territory was violated, with a majestic roar, a terrifying coercion enveloped a radius of dozens of miles.

The blue-scaled demon python, born in the mysterious burial immortal valley, has the blood of ancient beasts flowing on its body, at this moment it has a long letter, even under the pressure of the black dragon, it has not shown the slightest awe, but roared angrily at it, and did not fall behind at all.

The black dragon phantom and the blue-scaled demon python hissed at the same time, and the two beasts fought in the water, causing bursts of terrifying fluctuations, and even rolling up countless waves and whirlpools.

Lu Chen was worried about the safety of his demon beasts, so he instantly sacrificed the Zhenxian Tower, and then jumped into the Black Dragon Lake with a pop.

It turned out that this black dragon phantom was a trace of remnant soul left by the black dragon before it ascended, and for countless years, it began to give birth to its own consciousness, and since its cultivation, it has grown into an eighth-order demon beast.

After communicating with the green scale demon python, Lu Chen learned that as long as he could devour this dragon soul, the green scale demon python would be able to evolve into a dragon, not to mention this small step, but it could increase the demon beast's own bloodline by several levels.

Lu Chen raised the Zhenxian Pagoda in his hand and shot towards the black dragon phantom, sensing the terrifying aura of the Zhenxian Tower, the black dragon remnant soul raised his head and let out a roar, his body trembled, exuding an aura of surrender and awe, so that the attack on the blue-scaled demon python was temporarily stopped.

The green scale demon python took the opportunity to swallow the black dragon remnant soul in one bite, and after a while, it could be seen that the green scale demon python's body was covered with bursts of dark green light, and the aura on its body gradually changed, and then the python body circled together.

Through mental communication, Lu Chen knew that the blue-scaled demon python was about to fall asleep and retreat, so he put it in the storage ring.

Lu Chen smiled, judging from his usual experience, when the green scale demon python woke up next time, he would definitely be promoted to a big rank.

As a descendant of ancient beasts, once the blue-scaled demon python succeeds, it is conceivable that its strength will inevitably have a qualitative leap.

Lu Chen's figure continued to sink more than a thousand zhang, and a corridor surrounded by walls on three sides appeared, and the moment he stepped into the corridor, he was not stained with water at all, and he was extremely dry, and after walking hundreds of zhang, he finally reached the end of the corridor.

Behind the end of the corridor are a series of green jade steps, about four or five zhang wide, in the shape of a step, leading to a black gate below.

There was a groove on the door, and Lu Chen guessed that it was used to place the secret realm key, and sure enough, after Lu Chen embedded the pair of jade pendants, the black door slowly opened automatically.

A natural huge karst cave came into Lu Chen's eyes, the cave was surrounded by extremely hard gray stone rocks, and a pool of water appeared in the center of the cave, flowing with a faint milky white liquid, exuding a rich aura. At the top of the cave, there are tens of thousands of stalactites, and sometimes there are water droplets dripping down and hitting the pool on the ground, making a beautiful sound. Next to the pool, a colorful fruit tree grows quietly, and a fist-sized, purple fruit hangs from the branch, exuding a fragrant and fruity smell.

"Ten thousand years of stalactites!, and the legendary purple spirit fruit!" Lu Chen was overjoyed.

Ten thousand years stalactite, according to ancient records, this thing is only useful for demon beasts, and it can increase the bloodline level of demon beasts.

Purple spirit fruit, after the monk swallows it, it can not only wash the marrow to improve the physique, but also add a thousand years of life, the most valuable thing is that this fruit is rich in medicinal power, and the monk can greatly increase the essence and blood in the body after swallowing and refining, and from helping the monk break through the cultivation barrier in one fell swoop, it is one of the rarest spiritual fruits in the world of cultivating immortals.

By chance, Lu Chen decided to summon the Celestial Crystal Ant from the Storage Ring to help it evolve.

As soon as more than 30,000 third-order Celestial Crystal Ants and more than 10,000 Fourth-Order Celestial Crystal Ants appeared, they were attracted by the 10,000-year-old stone milk in this pool, their eyes were full of crazy colors, and in an instant, more than 40,000 Celestial Crystal Ants rushed into the pool and disappeared.