Lin Fei was very familiar with the Flame Hell, so he didn't plan to explore the surrounding environment, and after observing the terrain, he headed towards the depths of a canyon.

Lin Fei just wanted to find a place where the fire type spiritual energy was abundant, so that he could cultivate the "Great Sun Golden Crow Heart Sutra", and he was really not interested in some of the trial materials that could be obtained in the Flame Hell.

After all, the Flame Hell is only a place of trial for cultivators in the foundation building stage to take risks, how many good things can there be? You must know that Lin Fei's current vision is equivalent to that of a strong man in the Yuan Infant Stage!

After Lin Fei entered the canyon, he hadn't gone too far, and from the underground lava river next to his feet, a ball of fire suddenly rushed out, almost as tall as a person, like a spirit formed by a flame, rushing towards Lin Fei.

The fire spirit energy in the fire hell is abundant, and it is really normal for this kind of fire spirit condensed by fire spirit energy to appear, so Lin Fei did not have the slightest surprise, he directly stretched out his hand and waved, and suddenly a fist-sized flame formed in his hand, and he greeted the fire spirit.

The flame in Lin Fei's hand was the fire of the Golden Crow that he obtained by cultivating the "Great Sun Golden Crow Heart Sutra", although it was only equivalent to the level of just getting started, but for the fire spirit, it was the mortal fire that met the real fire, and was directly refined by the fire of the Golden Crow, turning into a piece of fire crystal and falling to the ground.

Fire spar is the crystalline body condensed in the body of the fire spirit, and the reason why the fire spirit can transform depends on the action of the fire crystal, which is also the only valuable thing in the whole body of the fire spirit.

Fire spar is the basic ore of fire attributes, which has a wide range of uses, although the value is not high, it is an indispensable resource for the development of basic industries in Kunlun.

Like the fire crystal that Lin Fei is refining now, it is almost worth more than twenty Kunlun coins, as long as he gets two or three pieces, then he will not lose money when he enters the trial of the Flame Hell.

What is really valuable is the high-grade fire spar condensed in the body of the fire spirit, and its quality is more than dozens of times that of ordinary fire crystal, which is a material that can be directly used to refine weapons, and the value of any one is more than a thousand Kunlun coins.

However, the grade of the Fire Spirit General is equivalent to that of a cultivator in the foundation building period, and a trace of spiritual wisdom was born, and he knows how to take advantage of the good fortune to avoid evil, which is not as easy to deal with as ordinary fire spirits, and it is not easy to kill.

Basically, only those cultivators in the Foundation Building Stage who are familiar with each other, after they have the opportunity to meet in the Flame Hell, join forces with each other, and only then can they have the opportunity to kill the fire spirit and get the high-grade fire crystal.

For Lin Fei, he couldn't look down on the ordinary fire crystal at all, and he didn't have space equipment such as storage bags, so he turned a blind eye to the refined fire crystal, so he abandoned it to the ground and continued to go towards the depths of the canyon.

Along the way, Lin Fei encountered several fire spirits, but under the attack of the Golden Crow Fire, these fire spirits were instantly refined, and there was no threat to Lin Fei.

It wasn't until Lin Fei reached the bottom of the canyon that he stopped and looked at the surrounding environment.

It is estimated that within a radius of dozens of miles, this should be the lowest place, and even the lava river that I saw earlier originated from here, and you can see hot lava rising from the ground outward.

Such a place is relatively the most abundant fire-type spiritual energy in the vicinity, and it is just right to use it to cultivate the "Great Sun Golden Crow Heart Sutra". So Lin Fei condensed the fire of the golden crow and burned out an underground cave several zhang square next to the lava river, which was juxtaposed with the underground fire outlet.

A place for temporary retreat is almost as good as this, but Lin Fei naturally has other arrangements for the sake of safety.

I saw Lin Fei take out one gadget after another from his backpack and arrange them around the underground cave according to certain rules, and then put away the last few remaining gadgets close to him, and then entered the underground cave, and after moving a boulder to seal the underground cave, he began to cultivate the "Great Sun Golden Crow Heart Sutra"!

A place like the Flame Hell was naturally different from the environment in Canghai City, and after Lin Fei ran the "Great Sun Golden Crow Heart Sutra", the fire spirit energy quickly gathered around him, just like Lin Fei's body turned into a bottomless pit, absorbing the fire spirit energy into his body with amazing efficiency.

It was also fortunate that Lin Fei chose to cultivate in such a hidden place, otherwise, with such abnormal spiritual energy fluctuations, he would not be able to hide from those cultivators with keen six senses. Moreover, as Lin Fei was a compound cultivator, how could his previous arrangements outside not be of the slightest use?

As the fire spiritual energy gathered more and more, there were already clusters of flames burning directly in the underground cave, and at this time, around the periphery of the underground cave, several dark red pillars of light lit up in turn, gathering together in mid-air a few meters above the ground, and then turning into a light mask, which just shrouded the area where the underground cave was located.

The method used by Lin Fei naturally involved the way of the formation, which was by no means something that ordinary cultivators could master, because the arrangement of the formation involved extremely complex calculations, unless it was a cultivator who had talent in this area, it would be difficult to peek into it. It can be said that a formation mage who understands the way of formation is one of the rarest professions in the Kunlun realm.

Compound cultivators are involved in all aspects, in the previous life, Lin Fei was not the top in the way of formations, but he was not only at the level of the first glimpse of the path, otherwise he would not have arranged a forbidden formation with the cultivation of the qi refining period. Moreover, in this forbidden formation, there is also a hidden killing formation, which can form a counterattack against those who forcibly break the formation, which can definitely be regarded as an effective means to protect Lin Fei's retreat and cultivation.

Lin Fei ran to the Flame Hell alone to take an adventure, if he didn't have the means to protect himself, why did he be so relieved and bold to retreat and cultivate in the land of trials?

With the protection of the forbidden formation, Lin Fei's movement of gathering fire-type spiritual energy in the underground cave was naturally suppressed to a minimum, unless it was extremely close to this place, it would be difficult to find that this place was so abnormal.

Lin Fei's arrangement was not thoughtless, but he still missed one point, that is, he underestimated his body after being transformed by nanoparticles!

After the absorption efficiency of the fire-type spiritual energy reached 100%, once he was able to continuously cultivate, the amount of fire-type spiritual energy he absorbed was completely beyond Lin Fei's imagination!

Even if Lin Fei laid out the forbidden formation in advance, no matter how exquisite the formation was, its power also had an upper limit, and when the fire spirit energy was so much that it could no longer be hidden, it would break through the ban and form a fiery red pillar of light that rose to the sky!