The underground city is all made of stone, with round stone pillars supporting the roof, and stone walls all around, which looks vast and atmospheric.

Every dozen or so steps there is a stone basin full of crystals, which are colorful and radiate light, shining on the underworld.

"Why is it that all of them are illuminated with crystals, only the Tong clan has a tradition of using crystals for lighting." Tong Bo muttered quietly when he saw the crystal stone in the underground city.

Tong Bo's voice was very small, but it was still heard by Guo Zhu, and said with a smile: "Perhaps, Yin Zhong and the Tong clan have some origins." ”

"Brother Tai said that it was funny, the Tong clan has been living in Shuiyue Cave for five hundred years, how can they have a relationship with Yin Zhong." Tong Bo smiled gently.

Guo Zhu shook his head, "Then maybe, think about how you entered the Water Moon Cave Heaven." ”

Tong Bo thought for a moment and whispered, "Maybe, let's find Tong Xin first." ”

Guo Zhu nodded and said no more, and the two began to search.

The difference is that Tong Bo is looking for it carefully, while Guo Zhu is pretending to be searching, quietly observing the environment of this underground city.

Although he knew about the existence of the Underground City, he had never been to the Underground City with Yin Zhong.

'I don't know if the blood pythons will attack me in the underworld?' Guo Zhu thought about it, under Yin Zhong's teaching, the blood python already knew Guo Zhu, and if it did not conflict with Yin Zhong's order, it would listen to Guo Zhu's words.

This is also why, Guo Zhu was able to save Zhao Yun under the mouth of the blood python.

For a while, I tried not to make a move, if I and Tong Bo shot at the same time, the blood python would definitely die, this pet is quite interesting, when I return, try to abduct it. Guo Zhu secretly made a decision in his heart.

The underground city occupies a very large area, how big the Edgeworth Villa is, how big the underground city should be, and there are many forks in the road, just like a maze, walking and walking to a dead end, walking for about a quarter of an hour, and it has not been finished.

"Second brother, eldest brother, childlike eyes hurt so much, come and save childlike heart."

At the same time, Tong Xin, who was soaked in the mercury pool by Yin Zhong, was still calling out to his brother, expecting them to come to his rescue, but the voice was getting quieter and quieter.

……

"Tong Bo, did you hear anything?" Guo Zhu vaguely heard some voices and whispered to Tong Bo.

"What sound?" Tong Bo was a little puzzled, then held his breath and began to listen carefully to the sounds around him.

After a while, Tong Bo was pleasantly surprised: "It seems to be my brother's voice, Brother Guo, your ears are so sensitive." ”

'With more than 300 years of mana, if you don't have sensitive five senses, you will have ghosts. Guo Zhu complained in his heart, but said: "I heard that the voice seemed to come from that direction." As he spoke, Guo Zhu pointed his finger and pointed in the direction where the voice came from.

Before Guo Zhu finished speaking, Tong Bo walked forward.

The further forward you go, the clearer the sound becomes.

"It's childlike innocence, it's childlike innocence." Tong Bo picked up the pace again.

After a while, the two of them saw the central part of the Undercity, the mercury pool.

Mercury pool, there are two pools, inside and outside.

The outer pool is separated by the inner pool, and there are bridges on both sides to reach the middle pool, and the mercury pool in the middle is a true octagonal pool, the pool is not large, about five or six square meters.

When Guo Zhu quietly admired the mercury pool, Tong Bo had already rushed up and saw his younger brother Tong Xin.

The childlike heart was lying alone in the pool of mercury, already bleeding from seven orifices, so it was not miserable, and it was obvious that the toxins of mercury had seeped into his body.

Tong Bo looked at his younger brother silently, his heart was full of pain, "It's all the eldest brother who is not good, the eldest brother has not taken good care of you." ’

The childlike heart, who had already been unable to open his eyes, thought that Yin Zhong was back when he heard the footsteps, and hurriedly said: "You let me go, otherwise my eldest brother and second brother will definitely teach you a good lesson when they come, let me tell you, my eldest brother and second brother are very capable of fighting." ”

"What are you hesitating about?" Guo Zhu, who followed up, said: "This mercury pool is highly poisonous, hurry up and save your brother." ”

When Tong Bo heard this, he woke up like a dream, regardless of the tears on his face, his body rose into the air, and he turned over the mercury pool, grabbed the childlike heart soaked in the mercury pool, and dragged the childlike innocence out of the mercury pool.

The rescued childlike heart lay in Tong Bo's arms and shouted: "Don't touch me, my eldest brother and second brother will come to save me in a while." ”

Tong Bo gently wiped the blood from the corners of Tong Xin's eyes, and his voice choked, "Don't be afraid, don't be afraid, big brother is here." ”

"Big brother, big brother, you're finally here, you're finally here to save your child's heart." Tong Xin hugged Tong Bo and shouted happily, "What about the second brother, is the second brother here?" Second brother, don't scold me, I was wrong. Speaking of this, the expression on the child's face turned to fear and grievance.

"Don't be afraid, the second brother didn't come, and the eldest brother is with the eldest brother, who is a friend of the eldest brother." Tong Bowen comforted the child's heart.

Hiss...... Hiss...... Hiss hiss

"Big brother, go quickly!" Tong Xin suddenly pushed Tong Bo away, "There's a big snake here, it's terrifying, big brother, you go quickly." ”

"What kind of snake is there? Childlike innocence, what nonsense are you talking about. Tong Bo looked around and found nothing.

Tong Bogang wanted to help his childlike heart, but when he saw Guo Zhu's solemn face, he couldn't help asking, "What's wrong?" ”

"Your brother is probably right, there is indeed a giant python in the Imperial Sword Villa, and on the day of the succession ceremony, many people in the rivers and lakes have seen it." Guo Zhu made a vigilant gesture.

When Tong Bo heard this, he said to Tong Xin: "Tong Xin, you lie down obediently, and the eldest brother will take you away if he kills the big snake." "Saying that, the childlike body is flattened.

Then he said to Guo Zhu: "Brother Guo, if there is an enemy, please ask Brother Guo to protect the younger brother." ”

"Wouldn't it be more certain that the two of us would shoot together?" Guo Zhu said tentatively.

Tong Bo shook his head, "I'm here to save my brother, that's what's important, and it's a great favor for Brother Guo to accompany me to this Longtan Tiger's Den......."

"Okay, don't talk about it, I'll help you protect your brother." Guo Zhu stretched out his hand to interrupt Tong Bo's words.

As soon as the two finished speaking, the hairs on Tong Bo's body stood on end, and he sensed danger.

This feeling is his instinct for many years of martial arts.

He slowly turned his head and saw a behemoth.

A giant python stood up and looked down at them.

The python's eyes were indifferent, spitting out letters, ready to attack.

Suddenly, the giant python attacked, its body rapidly downward, and rushed towards Tong Bo with its bloody mouth open.

Tong Bo shouted: "Brother Guo, be careful, protect my brother." Then he jumped to his feet and dodged the python's pwoop.

Guo Zhu had mana in his body, and he discovered the blood python earlier than Tong Bo, but he felt that the blood python had no ill will towards him.

He knew that the Blood Python's target was Tong Bo.

When Tong Bo told him to be careful, he quickly stepped forward and took away the child's heart.

Guo Zhu put the childlike innocence on the stone wall conveniently, and turned back to watch the confrontation between Tong Bo and the blood python.