Ji Tianxing and Yun Yao passed through the cave and entered a spacious tunnel.
This tunnel, which was located deep underground, was actually more than ten zhang high and three zhang wide.
The ground and the walls on both sides of the tunnel were paved with huge black rocks. They were flat and neat.
It was obvious that this passage had been artificially created.
The surface of the huge black rocks was covered with the marks of time. It was obvious that it had experienced a long time.
Yun Yao frowned in confusion and asked, "Strange, the Hundred Flower Valley has always been occupied by the Twin Flower Demon and the Ten Thousand Bone Demon. Why would there be an ancient tunnel deep underground?"
Ji Tianxing looked at the end of the tunnel with a serious expression and said, "Yao Yao, the Ten Thousand Bone Demon came out from the bottom of the Flower Valley. This tunnel is probably related to it.
Also, I can sense that the end of this tunnel is probably a demon's den. There's an extremely strong demon aura coming from it … "
Yun Yao nodded slightly and said, "I can sense it too. There's still the aura of the Ten Thousand Bone Demon here. It's very likely that it's hiding in its den … Are we still going in?"
Ji Tianxing thought for a while and a cold light flashed in his eyes. He said in a low voice, "Damn that Ten Thousand Bone Demon. It made us so miserable and almost lost our lives!
How can we let it go so easily? It's even more impossible for us to escape like this! "
"Alright, then we'll have to be even more careful!" Yun Yao nodded in agreement with his decision and exhorted.
Soon, fifteen minutes passed.
The two of them walked along the pitch-black stone tunnel for more than ten miles underground. They took several turns along the way.
Finally, the two of them were about to reach the end of the tunnel.
There was a straight and wide stone tunnel under their feet. A thousand zhang in front of them was a pitch-black hall.
Ji Tianxing and Yun Yao walked side by side. They both held their swords and were on high alert.
Yun Yao suddenly frowned and her gaze fell on the wall on the right side of the tunnel.
She saw a grayish-white skull embedded in the pitch-black stone wall that was thirty zhang above the ground.
Judging from its appearance, the skull belonged to a human martial artist. Moreover, it was a middle-aged man.
Ji Tianxing observed it carefully for a while and discovered that the bones of the skull had been strengthened, making it comparable to an Immortal Divinity level magical treasure.
He could basically conclude that the owner of the skull was a human warrior at the Primordial Soul Realm when he was alive.
At this moment, Yun Yao pointed at the left wall of the tunnel.
On the left side of the wall, there was also a skull three feet above the ground.
The skull belonged to a human warrior at the Primordial Soul realm.
The two skulls were facing each other, and both of them were looking down at the ground. It was quite strange.
Ji Tianxing and Yun Yao continued to move forward. They discovered that a pair of skulls were embedded in the rock walls on both sides of the passage every hundred feet.
Such meticulously arranged skulls made the pitch-black tunnel even more eerie, filled with a strange and terrifying atmosphere.
"Why inlay skulls on the walls? Could it be some kind of formation or ritual? "
"Maybe the Ten Thousand Skeletal Demon deliberately arranged it to show its identity or dignity?"
The two of them walked along the tunnel for ten thousand feet and discussed secretly with each other.
There were exactly two hundred skulls embedded in the tunnel that was ten thousand feet long.
Fortunately, when the two of them reached the end of the tunnel and stepped into the main hall, the skulls did not move, and there were no anomalies.
The main hall was very spacious, with a radius of a thousand feet, but it was not pitch-black.
The floor that was paved with black boulders was carved with dense, winding patterns of the Ghost Clan, which seemed to form a great formation.
The formation was operating, and the secret runes were also shining with dark red or dazzling purple brilliance. They were constantly flickering, and their brightness was fluctuating.
With the brilliance of the patterns of the formation, Ji Tianxing and Yun Yao could see that the walls around the main hall were engraved with countless pictures of deities and ghosts.
Most of the pictures were of ferocious, ferocious demons and evil gods.
In addition, in the four corners of the east, south, west, and north, there were four skulls embedded in the walls that were a hundred feet above the ground.
Those four skulls were also the skulls of human martial artists.
Although they had been there for thousands of years, they had not turned grayish-white and were still sparkling like jade.
Upon closer inspection, Ji Tianxing discovered that every skull had been tempered by lightning, and there were even tiny lightning patterns left on them.
"These four skulls belong to human martial artists in the Tribulation Transcendence Realm, and they have experienced at least five Lightning Tribulations!"
This result made Ji Tianxing and Yun Yao frown. They increasingly felt that this main hall was strange, and there must be some secrets hidden.
Fortunately, the four skulls were embedded in the walls without moving, and there were no abnormalities.
Ji Tianxing and Yun Yao ignored them for the time being and continued to observe the situation in the main hall.
In the north of the main hall, there was a ninety-feet-tall black altar on the ground close to the wall.
It was unknown what material the altar was made of, but it was inlaid with many Demon Crystals and Blood Essence Stones, emitting a strange rainbow light.
This altar was also very old, and it had been there for at least a thousand years.
At the top of the altar was a blood pool that had a radius of thirty feet.
Ji Tianxing and Yun Yao checked the area and saw that the sunken blood pool was filled with purplish black blood. The blood was bubbling and surging.
A very pungent smell of blood came from the blood pool and filled the entire main hall.
In addition to the bubbling blood, there was also a large ball of five-colored light floating above the blood pool.
Ji Tianxing took a closer look and saw clearly that there were over a hundred Remnant Souls in the water tank-sized ball of light.
Some of the remnant souls were ice-blue, some were dark red, and some were grayish-white.
Every remnant soul represented a martial artist at the Essence Soul Realm and above.
However, the hundreds of remnant souls were not only of human martial artists, but also of demon beasts and martial artists of other races.
Under the catalysis of the altar's power, the five-colored ball of light slowly rotated.
Every fifteen minutes, a dark red stream of air would fly out of the ball of light and rise into the air.
Ji Tianxing's gaze followed the stream of air and looked up. He saw a huge blood-red skeleton embedded in the north wall!
It was a skeleton troll that was a thousand feet tall. Its bones were dark red and flowed with red light, as if blood was flowing.
The skeleton troll was embedded in the wall and sat on a huge white bone throne.
The white bones that were as translucent as jade formed a twenty-foot-tall throne. Green, blue, and red gems and crystals were embedded in the throne.
This scene was very strange, and there was a sense of horror and majesty.
Ji Tianxing and Yun Yao were stunned for a moment. They looked at the Blood Skeleton and sized it up carefully.
They saw that the Blood Skeleton's body was also formed by countless broken bones.
Its skeleton and body were almost the same as a human woman's, except that it was more than a hundred times larger.
In the dark red skull, there was a pair of deeply sunken eye sockets. There was nothing inside.
Its hands were placed on the armrests of the white bone throne, but its wrists were tied to the throne by thick bronze chains.
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