Although Wei Zongxun is young and his cultivation is only one layer of foundation, his status in Qingxuanzong is relatively high, no less than the cold smoke when he just built the foundation.

He is a rare formation mage in the sect, and once this kind of talent grows up, it will be of great help to the Qingxuan Sect. Once he can advance to the fourth level of the formation mage, even Jin Lao Zu will give him a lot of face.

Therefore, even if the cultivation is far from the same, Zhang Zhixuan did not dare to slack off along the way, and respectfully took Wei Zong's family.

With the continuous conversation with Wei Zongxun, Zhang Zhixuan also had a little understanding of the process of opening up the fire eye.

Although the earth fire is stable and burns at an extremely high temperature, it is unfortunately not as pure and pure as the monk's true fire. There are countless mineral vein impurities in the earth fire, and after accumulating and smelting, it will become the earth lung poisonous fire.

This kind of earth lung poison fire is colorless, odorless, traceless, silent, formless and substanceless, and will be mixed in the ordinary earth fire. Unless there are some cultivators who practice fire attribute exercises, it is almost difficult for ordinary people to tell the difference.

The poisonous fire underground is extremely poisonous and extremely troublesome, once it is contaminated, even high-level cultivators such as Zifu Jindan, if they can't get rid of it immediately, it will leave hidden dangers that are difficult to solve.

Therefore, if you want to open up the eye of fire, the first step is to purify the earth fire and eliminate the earth lung poison fire from the outside. If you want to purify the earth fire, you must arrange the formation, and you need a third-order magic weapon that is not afraid of the smelting of the earth fire to act as the eye of the formation.

In addition, the temperature of the earth fire is very high, and ordinary materials will be easily smelted, and they will not be used for too long.

The materials used to build the fire chamber must also use very good refractory materials, which often require the help of a third-order refiner. However, the Zhang family has Zhang Sidao, a third-order refiner, and in order to build the alchemy room this time, Zhang Sidao also followed Zhang Zhixuan back to the mountain to help.

In the three southeastern counties, the best refractory material is the fire-fighting brick invented by Qingxuanzong. This refractory brick uses thirteen kinds of materials, including refined copper, basilica, white crystal, and clay, and can only be smelted with the real fire in the monk's body.

The recipe for the fire-removing bricks has always been kept secret and not passed on to the vassal Zhuji family, but in order to build the earth-fire room, the Wu family also invited the internal refiners of the sect to help refine the fire-removing bricks. With the precedent of the Wu family, Zhang Zhixuan could also ask Sidao to help refine the fire bricks.

In the fifteen years since Si Dao built the foundation, he has learned more than a dozen refining methods for third-order magic weapons within the Qingxuan Sect. Because Zhang Zhixuan notified him in advance, he also consumed two hundred good deeds to learn the refining method of fire-removing bricks.

As long as the Zhang family finds materials, Sidao can refine the fire bricks at home.

The materials for refining fire-dispelling bricks include spiritual objects such as refined copper and Xuanying stone, which are cultivated by monks, as well as mortal veins such as clay and white crystal. After Zhang Zhixuan returned home, he immediately mobilized the monks below and began to collect materials for Zhang Sidao to refine the fire bricks.

This process took two years, and in the two years, the fire bricks refined by Si Dao were able to build three fire refining rooms.

After the refining of the fire-dispelling bricks was successful, the Zhang family consumed almost three thousand spirit stones on this investment alone.

In the past two years, Zhang Zhixuan accompanied Wei Zongxun to visit the four spiritual veins of the family, and followed him to inspect the mountain range and find a suitable place to open the fire pit.

Lingjing Mountain was the first to be excluded, although the aura here is the best, but unfortunately the area is small, once the leylines are opened, the bottom fire can destroy this exquisite Lingshan in one fell swoop.

The Ten Thousand Snakes Cave is also not suitable here, although the Ten Thousand Snakes Cave is underground, and the amount of work may be smaller. However, the strength of this spiritual vein is not enough, and it is still in the middle of the underground cold pool, once the earth fire is opened, I am afraid that the conflict between water and fire will immediately cause a violent explosion and completely blow up the spiritual vein.

Moreover, a large number of Xuanyou grass is planted in the cold pool of the Ten Thousand Snake Cave, this kind of spiritual grass is a very important source of wealth for the Zhang family, unless there is no other suitable location, Zhang Zhixuan will not choose to open up a fire cave here.

The final location is still in the vast area of Jiuhua Mountain, Tiantai Peak selection, Tiantai Peak is majestic, if you open up the fire eye, you need to completely open up the Ling Mountain, the amount of work required is too large, I am afraid it will last for decades.

Although Jiuhua Mountain is also a big mountain, its height is only one-tenth of Tiantai Peak, and it is the most suitable location among the four spiritual veins of the Zhang family.

After choosing a place, Zhang Zhixuan immediately arranged for the monks to dig the cave, preparing to slowly open up the leylines and lead out the earth fire.

This kind of work can be completely handed over to ordinary mortals at the beginning, and when the underground water source is excavated, then it will be handed over to the Qi cultivation period monks to drain the groundwater and continue to dig deeper.

The further you dig, the higher the temperature of the cave, and eventually ordinary mortals will not be able to hold on, and then the excavation work will be handed over to the monks of the Qi cultivation period, and when it reaches the last thousand zhang distance, because of the underground miasma, it will even be necessary for the monks of the foundation building period to do it themselves.

In the past two years, Sidao was refining refractory bricks, Zhang Zhixuan arranged for people to dig fire holes, and Wei Zongxun would also collect materials and refine the formation of purifying earth fire.

Under Zhang Zhixuan's overall arrangement, all the work went hand in hand, and the fire-fighting bricks were placed in the fire pit, and then used a spell to integrate into one, the three fire refining rooms were already similar, and the excavation of the fire cave was almost to the time when the foundation building monks needed to come forward.

In order to speed up the progress, Zhang Zhixuan, the patriarch, and Zhang Sihong, the three monks in the foundation building period, personally came forward and entered the underground to dig the fire eye.

As for Zhang Tonghuai, who had just built the foundation, he was sent to Chaoyin Mountain by Zhang Zhixuan, and Zhang Sihong, who replaced the town guard, returned to the mountain. After all, he has just built a foundation, and his mana is insufficient, and he still needs a period of time to stabilize the realm.

Si Hong has been building the foundation for almost ten years, he is a second spirit root cultivator, cultivating in a place like Chaoyin Mountain, where there is plenty of spiritual energy, and he has broken through two layers of the realm in a row in ten years, far surpassing the Si Dao who built the foundation a few years earlier than him. In a few years, he will be ready to take Miao Zhen Dan and try to break through the middle stage of foundation building.

Among the three, Zhang Zhixuan's cultivation was the highest mana and the thickest, and he was young and strong, and he quickly dug into the deepest depths.

Another hundred and ten zhang can dig through the leylines and open the eye of fire.

The power of the Earth Fire Outbreak was quite violent, and even if Zhang Zhixuan's mana was already half that of the Purple Mansion Cultivator, he didn't have the ability to suppress this level of explosion. In the end, if you take the step of opening up the fire eye, you can only trouble cultivating to the highest Qingzen.

Qing Chan had been preparing for a long time, and he sacrificed the Six Yang Crossbows in a row, and after three arrows, he pierced the leylines and led to the earth fire.

A powerful explosion passed up from the eye of the fire, and the red, hot lava rushed down the eye of fire towards Qing Chan's side.

This stream of lava may be mixed with the poisonous fire of the lungs, even if Qing Chan opens the Purple Mansion, this kind of earth fire still has a strong threat to her.

After all, compared to the mighty and vast heaven and earth nature, Qing Chan's mana was insignificant at all, and it was difficult to protect himself in the bottom fire for too long.