Lu Yuqing's cultivation was far inferior to Han Li, Leng Yan Old Ancestor, and others. To prevent too much commotion, her speed naturally couldn't keep up.

"Get on the spirit boat." Seeing this, Han Li raised a hand and summoned the Azure Luan Spirit Boat.

Lu Yuqing thanked him and flew onto the spirit boat.

Han Li also floated onto the Azure Luan Spirit Boat, then chanted an incantation. With a wave of his hand, a ball of black water flew out from his sleeve, transforming into a layer of dark light that spread around, quickly enveloping the entire Azure Luan Spirit Boat.

Covered by the dark light, all the spiritual light fluctuations emitted by the flying boat seemed to melt like snow meeting fire, turning into an almost imperceptible shadow, without emitting the slightest aura.

Han Li nodded slightly. This was a concealing divine ability he had created in recent years by comprehending the Law of Water and combining it with the previously refined Heavy Water. It seemed to work quite well.

While pondering, he tapped the boat surface with his foot, and a flash of azure light appeared on his foot.

The flying boat immediately shot out, transforming into a blurry shadow, chasing after Leng Yan Old Ancestor and the other person, quickly catching up with them.

Han Li didn't get too close, staying far enough away to be outside their divine sense perception range.

"Brother Liu, why are we following these two?" Lu Yuqing asked softly.

Her cultivation was weak, and she hadn't dared to use her divine sense to explore earlier, so she hadn't heard the conversation between Leng Yan Old Ancestor and the other person.

"According to what they said just now, they had already been here when the Immortal Mansion opened last time. This time, it seems they are going to some treasure trove. We are new to the Underworld-Cold Immortal Mansion and have limited understanding of it. This is also not the area marked on your map. Instead of blindly wandering around, it's better to follow them," Han Li simply repeated their conversation, and then said.

"Our luck is really not bad. Although these two are quite strong, with Brother Liu's abilities, they are not worth worrying about at all. If there really is some treasure, we can play the mantis catching the cicada," Lu Yuqing blinked and smiled.

Han Li smiled noncommittally, then focused his mind, concentrating on tracking the two people ahead.

Leng Yan Old Ancestor was nothing, but Xiong Shan was a man of refined cultivation and alertness. Although his strength had greatly improved now, he didn't dare to underestimate him too much.

Seeing that Han Li was focused on controlling the flying boat, Lu Yuqing didn't disturb him. She walked to the side, sat down cross-legged, and closed her eyes to rest.

...

At the same time, somewhere in the Immortal Mansion.

This was a boundless ice field. Apart from some uneven hills, only a snow-white solitary peak stood in the center, piercing into the clouds.

The surroundings seemed quite quiet except for the occasional howling wind.

Just then, in front of the solitary peak, a semi-transparent, hazy white vortex appeared out of thin air in the void.

After the vortex converged, a jade flying chariot about ten zhang long appeared.

The flying chariot was long and narrow, exquisitely carved, like a jade ruyi. A tall, slender man stood on it, with two golden armored puppets holding long halberds standing at the front and rear of the chariot.

The man was surrounded by a layer of white light, flowing constantly, making his appearance somewhat hazy, but his features were still discernible.

As soon as he appeared, he scanned the vicinity, and finally his gaze fell on a certain direction.

"It seems I'm not too late."

After the man muttered to himself, the surface of the jade flying chariot beneath his feet rippled with a layer of green light. Then, with a whooshing sound, it transformed into a ball of green light and sped forward, disappearing into the distance in a few flashes, vanishing without a trace.

...

Leng Yan Old Ancestor and the other person flew forward all the way, without stopping in the middle. In the blink of an eye, they had flown for three or four days.

The ground below gradually ceased to be a vast ice field and gradually became a mountainous area. Mountains rose from the ground, all covered with thick ice and snow, shining brightly, looking quite beautiful.

The crystalline snow peaks rose and fell, creating a magnificent spectacle.

Among the snow peaks, occasionally one or two palace complexes would appear. Some even emitted faint spiritual power fluctuations when scanned with divine sense, indicating that there should be something inside.

However, Leng Yan Old Ancestor and the other person didn't even look at these buildings below, but simply flew straight ahead.

Although Han Li wanted to go down and take a look, he had no choice but to give up seeing the two people ahead acting like this.

"It seems that place is really quite far away. I hope it won't disappoint us," Lu Yuqing sighed softly.

"Let's see when we get there," Han Li nodded.

Just like that, the two parties flew one after the other for three or four more days, advancing who knows how many miles.

The area of this Underworld-Cold Realm was so vast, having flown for so long, there was still no sign of reaching the end.

A hint of surprise flashed in Han Li's eyes. He originally thought this was an Immortal Mansion, but the area of just one Underworld-Cold Realm was so large, probably not smaller than the Black Wind Sea Region. If other realms were added, it would probably be comparable to some small interfaces.

Leng Yan Old Ancestor and Xiong Shan had no intention of stopping at all, continuing to fly forward.

In the blink of an eye, another two or three days passed.

The snow peaks below slowly disappeared, and a vast sea appeared in front, boundless, vast, like an endless starry sky.

The seawater here was pitch-black, giving people a very viscous feeling. The cold wind howled in the air, and white snow fluttered, but the black sea surface did not stir up much waves.

The entire sea surface looked like a huge black mirror, giving people a very strange feeling.

Leng Yan Old Ancestor and the other person did not hesitate at all, heading straight into the depths of the black ocean.

Han Li frowned slightly, but stopped at the edge of the black sea.

Leng Yan Old Ancestor and the other person were flying so non-stop in front, it was hard to say that they had not already discovered them, and were doing it on purpose, and might even have set a trap ahead.

Now in the depths of the Immortal Mansion, he could not be careless in the slightest.

He looked at the black ocean in front of him, his eyes flickering twice, and asked Lu Yuqing, "Miss Lu, do you know the situation of this black sea area?"

"The information obtained by Blackwind Island still doesn't mention this black sea area," Lu Yuqing shook her head.

Han Li couldn't help frowning upon hearing this, and pondered in silence.

"Brother Liu, should we continue to chase them?" Lu Yuqing looked around and asked.

Having chased for several days in a row, she also felt a little apprehensive.

"We've already chased to this point, it's a pity to give up now. I want to see where they're going." After thinking for a while, Han Li still said.

He made a hand seal and urged the Azure Luan Spirit Boat to fly forward.

Although Leng Yan Old Ancestor and the other person had already disappeared, the spiritual power traces left by the two people's flight were still there, so there was no need to worry about losing them.

Han Li urged the Azure Luan Spirit Boat to speed up, and soon caught up with Leng Yan Old Ancestor and the two.

The two groups flew one after the other towards the front, and this flight was another day.

Han Li frowned slightly. Although he didn't know how big this black sea area was, having flown for so long, he must have reached the depths of the sea area.

How long are these two going to fly...

He had been following them for almost ten days, and if it was a normal treasure hunt, there should have been a lot of gains, but now he had gotten nothing.

He hoped that these two were really going to some treasure trove, otherwise he would be losing out too much.

While Han Li was thinking about these things, his gaze that was looking forward suddenly condensed, and he gave a soft "eh" sound.

"Brother Liu, what's wrong?" Lu Yuqing couldn't help asking.

As soon as her voice fell, clumps of white mist suddenly appeared in the originally empty sea area in front.

The mist faintly emitted dots of white crystal light, looking quite strange.

Strands of bone-chilling cold air emanated from the white mist, and the temperature of the surrounding sea area dropped sharply.

"This is..." Lu Yuqing was stunned, with a look of contemplation on her face.

Seeing the white mist in front, Leng Yan Old Ancestor and the other person stopped their escape light, and joy appeared on their faces.

"Great, we finally found it." Leng Yan Old Ancestor breathed a sigh of relief, and then said excitedly.

Xiong Shan also showed joy and nodded.

The two looked around a few times, and cast spells to explore whether anyone was following them.

Han Li had also stopped the flying boat at this moment. Hearing the conversation between the two, his eyes lit up suddenly.

Have they finally arrived!

Seeing the two people casting spells to explore, he hurriedly made the flying boat retreat a distance again.

Leng Yan Old Ancestor and the other person did not detect anything unusual, and soon continued to fly forward, disappearing into the white mist, and speeding up a lot.

Han Li made a hand seal, and the Azure Luan Spirit Boat also accelerated its escape speed, and flashed into the white mist.

The Azure Luan Spirit Boat traveled through the white mist sea, and strands of cold air permeated in.

This cold air was extremely peculiar, like needles and thorns, with extremely strong penetration power. Even though the Azure Luan Spirit Boat was surrounded by Heavy Water, there was still cold air constantly seeping in, and the flying boat's protective spiritual power could not resist it. A layer of white frost slowly appeared on the boat's surface.

Han Li frowned slightly, and with a wave of his hand, he made a hand seal.

Dozens of blue lights shot out from his sleeves, which were blue flags, falling on the edges of the flying boat, and quickly penetrating into it.

A layer of blue light curtain emerged, enveloping the Azure Luan Spirit Boat, and immediately isolated the cold air outside.

"Ah!" Lu Yuqing on the side suddenly exclaimed.

"What's wrong?" Han Li asked.

"Brother Liu, I suddenly remembered a rumor about the Underworld-Cold Realm. It is said that there is a Underworld-Cold Mist Sea in the Underworld-Cold Realm, which contains extremely strong cold air. Hidden in the mist sea is a Underworld-Cold Palace, which is the number one treasure of the Underworld-Cold Realm, but no one who has entered the Underworld-Cold Immortal Mansion in the past has ever found it. Could this be..." Lu Yuqing said somewhat excitedly.

"Underworld-Cold Palace!" Han Li's eyes also lit up suddenly.

He remembered the several conversations between Leng Yan Old Ancestor and Xiong Shan, the two people's expressions were very excited. All kinds of signs showed that Lu Yuqing's guess was very likely.

Thinking of this, Han Li took a deep breath, and then hurriedly urged the Azure Luan Spirit Boat, closely chasing after the two people ahead.

The further he went forward, the denser the white mist became, and finally it connected to the ground, making it extremely difficult to identify the direction.

Leng Yan Old Ancestor and the other person turned left and right in the mist, seemingly very familiar with the route ahead.

After flying forward for more than an hour, the two suddenly stopped.

Han Li had been paying attention to the movements in front, and naturally stopped when he saw this, urging the flying boat to hide in a clump of white mist, and looked towards the front.

A hint of surprise appeared in his eyes. He saw a black island located in the sea area in front. The island was not very large, only twenty or thirty li in size.

The entire island was shrouded in a layer of black glow. The glow was slender and dense, as if formed by countless black needles.

The black glow flowed, as if liquid was flowing, giving people an extremely mysterious feeling.

In the glow, a huge palace could be vaguely seen. Although it was not clear, it was also very spectacular.