"Why did it suddenly become so cold? The temperature seems to have dropped a lot all of a sudden? Do you feel it?" As she was walking, Qing Ying suddenly couldn't help but shudder.

Although Zhang Yunxian is not afraid of the cold, his perception is extremely sensitive, and he has naturally noticed this sudden change.

"It's a little weird! We walked in the snow for almost a night, and we didn't feel the cold, and we looked like we were about to come to an end, but we ......" Zhang Yun stopped in the middle of his gossip, because he had already figured out the source of the cold.

"What did you see?" Qing Ying noticed Zhang Yunxian's somewhat dull gaze and asked with some concern.

Zhang Yunxian shook his head, as if he couldn't believe his heavenly eyes: "At the end of the snow field, there is a world completely frozen in ice! I estimate that the frozen area may be a little wider than the snow field we just crossed!"

The cold air of the forest was emanating from the frozen world in front of him, and he already felt so cold from a distance of a hundred and ten miles, so it was conceivable that if he had to walk in such an environment for seven or eight hours or even longer, how could an ordinary cultivator be able to support it?

"Do you hold on?" Zhang Yunxian silently glanced at Qingying beside her, this is not enough, her little face is already blue from the cold.

Qing Ying gritted her teeth and said 'um', and without hesitation, she took out a 'water drop' from her arms, and gently threw it into a two-meter-high blister, wrapping herself again.

"It's so much better! won't you try?"

Zhang Yun smiled and shook his head: "This little chill can't help me!"

It didn't take long to walk, and after about half an hour, the two walked out of the Lin Hai Snow Field and stood in the new 'Frozen World'.

"It's really strange, why is the frozen world, much colder than the world that has just snowed?" Seeing Zhang Yunxian stop for a long time, looking into the distance and seeming to be exploring something, Qing Ying muttered in a low voice.

Zhang Yunxian couldn't answer her question, but sighed with mixed emotions: "Alas, this frozen world, I'm afraid it's not easy to walk!"

"It's a little cold, but it shouldn't be dangerous, right? I haven't encountered any obstacles along the way, right?" Qingying said puzzled.

"At present, there are already seven people in front of us!"

"Aren't there just three?"

"Well, now it looks like seven! Do you know what that means?"

"Does that mean we need to speed things up?"

"No!" Zhang Yunxian shook his head and explained, "Among the seven people in front, two of the Moon Worship Sect protectors, and two of them came in with me!

"Outsiders, do you mean that in addition to those who were present when we opened the secret realm, there were other cultivators who also followed?" Qing Ying was a little surprised, she was able to blend into the secret realm to grow, and the speed of progress was so fast, these three people were not idle people.

"Well, that's true! But that's not what I'm trying to say. Actually, I want to tell you that these seven people left us far behind from the moment they came in, but in the frozen world in front of them, their speed is getting slower and slower, otherwise I wouldn't have been able to see them!"

Qing Ying thought for a moment: "Maybe their physical endurance is also limited, right?"

"No, they're different from you!" Zhang Yunxian flatly denied, "They are not spiritual, they don't need to eat and sleep, and they won't be afraid of the cold! That's why I think there's something strange ahead, it stands to reason that their speed should at least be constant or even faster, but it looks a little difficult!"

These seven people, in addition to Yun Yi Zhenren and the two protectors of the Moon Worship Sect who had been found in the snow forest before, the remaining four people were Xing Zhen and Fu Hui, as well as Bai Shiyou and Jiang Zongyuan, two real people in black suits.

Zhang Yunxian could spot them, and they could naturally sense Zhang Yunxian's existence, but whether it was Yun Yizhen, Bai Shiyou and Jiang Zongyuan, they didn't immediately turn around and chase him, Xingzhen and Fu Hui didn't stop and wait for him, everyone maintained a serious attitude and walked forward on thin ice.

"Still, we have to keep walking!" Qing Ying couldn't help but be a little anxious, there were already seven people in front of her.

Zhang Yunxian hesitated for a moment, leaned out his foot and stomped the ice surface of half of the glass, but he didn't notice any danger, this ice surface is very strong!

But the seven guys in front of him, the worst strength is only a small realm lower than him, needless to say, the strong ones are all real people! Several of them are all cautious without exception, and there must be some unknown danger under this ice.

"Don't worry, let me take a closer look!" he said, and once again he picked up his eyes and looked under the bright ice.

Generally speaking, ice is formed by the condensation of water after it is cold, and a large area of ice, in Zhang Yunxian's limited cognition, can only be formed after the freezing of rivers, lakes or rivers.

However, the vast area of this frozen world in front of him is incomparable to any river, river, or lake on this planet, and what is even more bizarre is that when his eyes go straight to the bottom of the ice through the layers of ice, there are no fish, shrimp, crabs, and other creatures in the water, and he doesn't even see a drop of water, and the ground below looks like all dry sand, and there is no trace of mud at all, except for sand, there are only various black stones with strange shapes.

The moment he saw this black stone, Zhang Yunxian thought of the black stone house in the training base of the Crescent Moon Group, as well as the black altar ruins of the Bright God Altar.

That's right, these black stones at a depth of more than 1,000 meters below the ice surface, after Zhang Yunxian's careful investigation, are things with the same attributes as the above two.

The attributes of this black stone, as far as Zhang Yunxian knows so far, the biggest feature is that it can absorb all energy, whether it is essence or spiritual power, all kinds of attacks will be devoured when they encounter these black stones.

And below the ice, these strange black stones, densely packed with almost too many to count, and the size of each piece is not small, if there is no ice block on it so tightly, then what everyone sees in their eyes is only an endless black stone forest.

Suddenly, Zhang Yunxian seemed to have figured out something, and suddenly said to Qing Ying: "I know! Your guess is not wrong! This is really a secret realm left by the water tribe!"

Qing Ying let out an inexplicable 'um' sound, her eyes full of concerned inquiries.

Zhang Yunxian rubbed his brows: "If I'm not mistaken, the entire world in the secret realm should indeed be a vast sea!"

Qing Ying didn't speak, blinked and waited for Zhang Yunxian to continue to explain.

"Deserts, forests, and even the mountains and rivers I crossed at the earliest, as well as the red ocean you have seen, these landforms should all be part of the original sea!" Zhang Yunxian thought about it while sorting out his thoughts: "Yes! That's right! It must be like this! Don't you realize that the terrain seems to be flat along the way, but in fact, the altitude is slowly rising, isn't it?"

Qing Ying closed her eyes and carefully recalled the details of the environment along the way, and only after a while did she open her eyes and nodded as if she was awakened: "Indeed, as you said, from the Red Sea to the desert, from the desert to the Linhai Snow Field, and then to the current Ice World, unconsciously, we have actually been walking to a higher place!"

"Yes! That's it! The place where we first entered, whether it is the mountains and rivers where I am or the Red Sea you see, is actually the edge of this secret realm, or rather, the edge of the vast ocean! More than 5,000 years have passed, and the vicissitudes of life are also a normal thing, isn't it?"

"I don't know what exactly happened to this secret realm, but now it seems that it should be possible to make such an assumption: a cold current climate such as the level of destruction suddenly descended on this ocean of the water tribe one day, and most of the entire ocean was frozen in ice, but the disaster of cold snaps also has a regional limit, and the closer to the edge of the sea you are, the weaker the impact of this disaster should be. ”

"The Linhai Snow Field we just passed through should be the farthest distance that this cold snap could reach, and the impact was slightly weaker, so although it was not frozen, the heavy snow was endless. The farther desert area, from the point of view, is obviously the closest area to the coastline, because after the sea retreats completely due to freezing, the fine sand at the bottom of the water is exposed, and then after many years of weathering, it gradually becomes the desert ...... today."

Qing Ying listened quietly, closing her eyes and thinking for a moment from time to time, as if confirming in her mind what is the probability of the assumption made by Zhang Yunxian to be true.

"Of course, the most powerful evidence is the frozen world in front of us today. According to my assumption just now, this large area of ice should be the closest to the center of the secret realm, and I have just seen countless reefs and fine sand under this thick layer of ice, which just confirms this!"

"This kind of indication shows that the center of the secret realm is in the center of this frozen world!"

Qing Ying digested it for a minute or two, and felt that Zhang Yunxian's analysis was indeed tenable and reasonable, so she couldn't wait to urge: "Since it has been determined, what time are we delaying here?"

Seeing that she was in a hurry to rush forward, Zhang Yunxian hurriedly stretched out his hand to stop her: "This reef on the bottom of the sea is a bit unusual! If you rush forward, I'm afraid there will be fatal danger!"