Du Wu was anxious, and wanted to go to break the formation immediately. was stopped by Shi Zu.

Shi Zu said: "Wu'er, this array is personally laid by Grandpa Huo's master, it is very mysterious, the master will give you a little introduction today, tomorrow you go to break the formation, whether it can be broken or not is not a big problem, just to earn face for the master." ”

Du Wu hurriedly nodded in agreement.

So, Shi Zu Shi Jingshan began to introduce Du Wu to this fire dragon trapped immortal array.

It turns out that this Huoyun Island was formed by a volcano under the sea, and it was the last eruption a thousand years ago. Although there has been no eruption since, the fire in the heart of the volcano is still very active. According to the judgment of the two old men, Huo Zu and Shi Zu, the volcano has been active again recently, and it seems that there are signs of another eruption, which will cause devastation to the living beings within hundreds of miles around it.

The master of the Fire Ancestor traveled here by chance, liked the scenery here, and found a mysterious fire in the center of the earth in the crater. This earth-centered Xuanhuo is a treasure for those who cultivate the fire attribute exercises, and they can practice here extremely quickly. Huo Zu's master's name is the word "fire", because he thinks that he doesn't like other words, only the word fire is the most suitable for him.

After the old man discovered the earth-centered Xuanhuo under Huoyun Island, he lived in seclusion here, practicing with the help of the earth-centered Xuanhuo every day, and finally broke through to the emperor level. Later, he went out to walk the rivers and lakes and was called the "Fire Emperor". The Fire Emperor has been roaming the rivers and lakes for decades, with almost no opponents, and his pure fire is extremely domineering. Later, he returned to Huoyun Island to retire and discovered a secret of the geocentric Xuanhuo.

It turns out that this geocentric fire is the fire of the submarine volcano, which has been brewed by the volcano for thousands of years and has become extremely pure. At the same time, because the surrounding area is full of sea, the energy of the Xuanhuo is suppressed, and it accumulates more and more. This will erupt once every thousand years, causing a landslide and tsunami, and the entire Huoyun Island will also be reduced to ashes. Although it will be quiet for a while after the eruption, it will re-form an island, and the surrounding creatures will slowly recover, but many creatures will eventually die because of the eruption.

The old man of the Fire Emperor set up a large array here, called the Fire Dragon Trapped Immortal Array. This array has several functions, one is to borrow part of the power of the earth's core fire, so that it can be slowly vented and not to erupt violently, and the other is to suppress the power of all martial arts masters in the array, so as not to let some martial arts masters who strayed into this place inadvertently cause the eruption of the volcano. Then there is the power of the earth's core fire to the ground for his disciples to practice.

This array can be said to be very mysterious, except for those whose strength has reached the emperor level or above, they will be greatly suppressed by the strength of this big array. In fact, it is also a method of practice. Later, it was used by the sea of fire to trap Shi Zu, Shi Zu's strength at that time was still at the ancestral level, and after being suppressed, he was not the opponent of the sea of fire with deep formations, so he couldn't get out of trouble. Later, Shi Zu finally figured out the key to this. There are only two ways to break this formation, one is to know the formation and break it out, and the other is to break through to the emperor level in strength, so naturally it can not be suppressed by the big array. It was through the second method that Shi Zu broke through to the emperor level on Huoyun Island, so he was not suppressed by the big array, and he could already leave the island calmly, just because there was nothing important to do, and secondly, he wanted to use this array to train his juniors, so he made a bet with the sea of fire and let his disciples come to break the formation.

After Gu Cheng came to the island, although his attainment in the formation was very high, it was also very difficult to break this formation, and it took him several months, and he could only understand some changes in the formation slightly. Later, because of something, he couldn't continue to break the formation. However, while studying the formation, Gu Cheng's cultivation has been greatly improved, which is also the reason why Shi Zu let him break the formation.