"Xiao Yi, what do we do next? Are we going to explore this mysterious underground palace or not?" Duanmu widened his eyes and asked, rubbing his hands together. His eyes were full of desire.

"Yes!" Xiao Yi didn't even think about it. He immediately replied, "We're here to search for treasures, aren't we? Now that the Dark Yin Earth Dragon has brought us all the way here, this is a great opportunity. How can we stop here? I'm not a pedantic person. I'll be blamed if I'm found guilty."

"Okay! If you agree, that's good!" Duanmu clapped his hands excitedly and shouted.

Gu Lu also began to circle in the air at a high speed, eager to give it a try.

Jiuer had already recovered from the shock of being swallowed by the dragon, but she was completely obedient to Xiao Yi's decision. She stretched out her hand and immediately took Xiao Yi's big hand. She was ready as if she could go anywhere as long as Xiao Yi traveled with her.

Since Jiuer was with him, Xiao Yi had nothing to worry about. He immediately released his Divine Awareness and looked at the stone room when he got up.

Taking a closer look, he found that the pool contained an endless amount of Yin Qi. At the bottom of the pool, there was a big hole that could allow the Dark Yin Earth Dragon to come in, leaving only a simple layer of separating water formation. The rest of the ancient formations had been broken. Obviously, the dragon, who loved the most Yin Qi, had been eroded away by some unknown means over the past thousands of years.

This pool was the reason why the Dark Yin Earth Dragon frequently roamed this place. Even when it was on the brink of death, it had instinctively brought them to this place.

After figuring out the cause and effect, Xiao Yi also began to think about how to explore the problems of the mausoleum.

"Xiao Yi, this stone room is a barroom on the outer perimeter of the mausoleum. Take the water energy of the Five Elements to suppress the mausoleum. There is nothing to see. I will directly take you into the inner mausoleum. There are a few simple restrictions on the outer perimeter, but they can't stop me," Duanmu said at once.

"That's great!" With Duanmu's promise, Xiao Yi had nothing else to say. He immediately agreed.

Xiao Yi asked Gu Lu temporarily go back to the Fire Dragon Cauldron. After which, he grabbed Jiuer's small hand.

With a move of Duanmu's mind, he took Xiao Yi and Jiuer and disappeared into the void in an instant.

The next moment, within a breath's time, they appeared in an extremely spacious large hall.

The main hall was built with huge green strips of stones. It was about 333 meters high. There was nothing in the hall except for the bleak atmosphere of untainted land. Xiao Yi, Jiuer, and Duanmu felt a strong sense of deterrence as long as they were in the hall. They were unconsciously in awe and felt that they were so small.

On one wall near the inner mausoleum, there was a huge gate, which was no less than 15 feet high and 30 feet wide. It was made of two pieces of bluestone and looked very heavy.

"This is the door to the inner mausoleum. The restriction is too powerful for me to pass through. Next, you have to think of a way." Duanmu pointed at the door and said to Xiao Yi.

Even without Duanmu's reminder, Xiao Yi could tell that waves of light would pass through the large stone door from time to time. An extremely powerful repulsive force kept emanating from the door. Evidently, it was an extremely powerful restriction that prevented one from entering.

Not only that, but there was also a faint light shining on the wall next to it. Obviously, there were protective formations all over the wall and even under the ground.

Speaking of breaking formations, Xiao Yi was also a master in formations in his previous life. Over the past hundreds of years, he had studied countless formations. However, he did not know much about ancient formations.

Now, with such an intact ancient formation in front of him, Xiao Yi actually felt a sense of desire. He had been cultivating for hundreds of years and his heart had long been calm like still water. However, in front of this ancient restriction, Xiao Yi still wanted to have a try.

He pulled Jiuer and slowly walked toward the huge stone door. As they were walking, Xiao Yi released the Doomsday Sword. The arc of the sword shot out and hit the stone door.

With a "bang", the moment the sword arc hit the stone door, it immediately triggered the formation.

A strong fire burst forth. In the blink of an eye, the flames spread from the door to the entire wall, followed by a raging fire in every corner of the wide hall.

The ancient seal on the door was actually the ancient flame formation.

However, Xiao Yi's heart sighed in relief when he saw this scene. Compared to the other danger, the thing that Xiao Yi was least afraid of was fire.

Not only was there the Samei True Flame within his own Nascent Soul Realm, but the two spiritual beasts around him were also the flame ancient beasts.

One was Gu Lu, and the other was a Skylaurel Crow. Which one of them wasn't born with fire?

Therefore, Xiao Yi was not worried when he saw the fire in the room. He activated the Lotus Flower. A soft Buddha's light covered him and Jiuer in an instant. Then, Xiao Yi released Gu Lu and the Skylaurel Crow.

Gu Lu and the Skylaurel Crow both let out a cheer as they immediately entered the sea of fire. It was as if the two beasts were competing to devour the raging fire.

Moments later, the air around them was cool and refreshing. With these two hovering beasts around them, Xiao Yi could go into the volcano. Naturally, he was safe at the moment.

"Ha ha, good fellow. With these two fellows around, what other flame formation you cannot touch, Xiao Yi?" Duanmu, who had always thought nothing of anyone, involuntarily let out heartfelt praise when he saw this scene.

Xiao Yi merely smiled when he heard this. He did not reply. Instead, he unleashed his Divine Awareness around the huge stone door to investigate inside.

Who would have expected that a crackling sound suddenly appeared within the raging fire within the large hall at this moment?

Then, Skylaurel Crow and Gu Lu let out a grunt of pain.

Xiao Yi was shocked, but he immediately saw a scene that made him extremely surprised.

Countless pale purple lightning arcs had appeared in the blazing fire somehow. Skylaurel Crow and Gu Lu could swallow the flames, but they were unable to withstand the overwhelming lightning arcs. The two beasts were at a great disadvantage for a while.

Gu Lu was still fine. It had the body of a Flying Snake. Its body was strong, and its cultivation was already at the peak of the Core Formation Realm. Being struck by a few lightning arcs, it didn't hurt at all.

But Skylaurel Crow's cultivation was weak, and it had suffered a huge loss in an instant. Countless pale purple lightning arcs struck its body, causing the flame feathers to fall to the ground. Skylaurel Crow cried out in pain and started to keep moving from one side to the other.

While Xiao Yi was taken aback, he hastily waved his hand and recalled both of them back into the Fire Dragon Cauldron.

With the protection of the Buddha's light, they were safe for the time being. However, the lightning arcs became denser and denser. With the fire, the lightning arcs struck the shield of the Buddha's light, and it finally began to ripple.

"Xiao Yi, why is there thunder here? How did it break?" Duanmu looked at the lightning arcs that filled the hall. He was also very anxious.

However, before Xiao Yi could answer, there were bursts of astral winds within the raging fire and thunder arcs at that moment.

The strong wind blew against the light shield of the Lotus, making the it thinner.

The soft white light shield was like a boat floating in the wind and rain, ready to be destroyed at any time.

"Xiao Yi, what should we do? Why don't we withdraw first?" Duanmu cried out in surprise.

However, Xiao Yi didn't respond. He slightly frowned and asked slowly, "Heavenly Mystic Thunder Formation and Astral Wind and Raging Flame Formation?"

At this moment, Xiao Yi suddenly recalled. The scene before him was extremely similar to the protection formation of his Immortal Mansion.

However, at that time, as the conjurer of the formation, Xiao Yi had trapped the Utmost Wolf King, Luo Yin, and the others. The Nascent Soul Realm Realm stage experts, as well as the Transformation Stage demons, were almost killed in body and soul. Now, Xiao Yi was trapped in the formation.

However, no matter what, this large formation was obviously in the same way. It only released various kinds of fierce killing moves in a different order.

"Could this really be the Heavenly Mystic Thunder Formation and the Astral Wind and Raging Flame Formation? If that's true, then today, it's time for me to break these ancient formations!" With a thought in his mind, Xiao Yi immediately started to explore the mysteries of the Heavenly Mystic Thunder Formation and the Astral Wind and Raging Flame Formation in his Immortal Mansion.

Xiao Yi had already refined the life-bonded magical treasure of the Immortal Mansion. Now, it was easy for him to observe the two big formations. In a short time, he was overjoyed.

Sure enough, the two formations here were the Heavenly Mystic Thunder Formation and the Astral Wind and Raging Flame Formation, but they were more complicated.

To put it bluntly, the Heavenly Mystic Thunder Formation and the Astral Wind and Raging Flame Formation both evolved from the Eight Trigrams of the Innate Realm.

After the Heavenly Mystic Thunder Formation and the Astral Wind and Raging Flame Formation, there was the Water and the Wind and the Raging Flame Formation, each of which was incredibly powerful, and, all could be mixed together, endless, and extremely troublesome.

Xiao Yi knew that with his current strength, it would be extremely difficult for him to break through the formation if all the large formations here were to be mobilized.

This matter should not be delayed. The only thing he could do now was to crack the formation before the next formation was activated.

As a result, Xiao Yi managed to maintain the light shield that was on the verge of collapse and sent his Divine Awareness out, ignoring all consequences at all costs.

It was easy to imagine how his Divine Awareness would feel if it hadn't been for strong. Even so, there was still a huge shock coming from his Mind Sea, and blood came out of all seven apertures of Xiao Yi.

However, there was no reason to retreat at this time. He could only struggle to hold on.

Luckily, before injuring his body, Xiao Yi had finally found the eye of the formation with the help of the Heavenly Mystic Thunder Formation and the Astral Wind and Raging Flame Formation in the Immortal Mansion in his mind.

The formation eye was not on the shining stone door. Instead, it was within this empty large hall.

Xiao Yi communicated with Gu Lu and Duanmu using his Divine Awareness, ordering Duanmu to hide in the void and enter the location of the southwest corner of the main hall. On the other hand, Gu Lu appeared in the northeast corner of the hall to go against these two formations.

Xiao Yi took back his Divine Awareness, drove the Chequ Lotus, and immediately went to the far east of the main hall with Jiuer.

One man, one ghost, and one demonic beast, each occupied the positions of Li San, Zhen Si, and Xun Wu according to the Eight Trigrams.

Then, with the command of Xiao Yi, they began to attack the ordinary-looking bluestone floor tiles under their feet.