It took about an hour for Gao Xuan to treat Kuyan's wound, and during the whole process, Gao Xuan didn't know how many times he wiped his sweat.

In Gao Xuan's storage ring, there happened to be a few elixirs left by Old Man Gao to treat external injuries, and they were also heaven-level elixirs, and these elixirs were all used by Gao Xuan on Kuyan.

Although these elixirs are heaven-level quality, Gao Xuan doesn't feel wasted at all, as long as the bitter words can be restored, a few heaven-level elixirs are nothing.

After treating the wound, Gao Xuan took out another piece of clothing from the storage ring and covered Ku Yan, but Gao Xuan had new worries.

In the process of entering the Crypt Dragon Cave, Gao Xuan could clearly feel that the temperature was gradually decreasing, and now, although Gao Xuan did not need to use Xuan Qi to resist the severe cold, he could already feel the cold.

Ku Yan is now completely unconscious, it is impossible to use Xuan Qi to resist the cold, just now, Gao Xuan touched Ku Yan's hand, and found that Ku Yan's body temperature was even lower than the temperature of the cave where they were at the moment, which made Gao Xuan very anxious, because Gao Xuan had never imagined that a person's body temperature could be so low.

After pondering for a moment, Gao Xuan's whole body surged, and then, a fiery red ball of light like the dawn sun hung above Kuyan, making this small wall hole brighter, and at the same time, making this wall hole even warmer.

When entering the wall cave, Gao Xuan had already laid an enchantment at the entrance of the wall cave, even if someone passed by, they would not find that there was a wall cave here, because Gao Xuan's enchantment was very special, and he learned it from the two ancient books of alchemy left by Old Man Gao.

These ancient books left by the old man Gao to Gao Xuan don't seem to have names, and Gao Xuan doesn't know why this is the case, for the convenience of use, Gao Xuan himself named these books, two ancient books that teach alchemy, one is called "Danhuo Shenlu" by Gao Xuan, and the other is called "Lingdan Tasting Treasure Book".

Among them, the "Danhuo Shenlu" teaches the alchemy method, and the "Lingdan Tasting Treasure Book" teaches how to identify the Dan medicine level, and the enchantment arranged by Gao Xuan is learned from the "Danhuo Shenlu".

In order to create this absolutely stable environment, every time the alchemist refines the medicine, he will arrange an enchantment in advance to separate the alchemy environment from the external environment, and this enchantment is called the 'Heaven Covering Enchantment'.

Gao Xuan has just come into contact with the "Danhuo Shenlu", and the 'Heaven Covering Enchantment' he has mastered is not even a fur, he can only be said to have a trace of rudiment, but this trace of rudimentary form is enough for Gao Xuan.

Now, Gao Xuan can't see what the outside of the barrier looks like at all, and Gao Xuan believes that he can't see the inside outside the barrier either, which is equivalent to completely separating this wall cave from the outside world, as long as there is no accident, even if someone passes by, they will not find that there are two people in the rock wall.

After doing all this, Gao Xuan breathed a sigh of relief, as long as they waited for Kuyan to wake up, they would be considered to have the rest of their lives.

Before the completion of the apocalypse, Gao Xuan felt that Old Man Gao was targeting him everywhere, and now, Gao Xuan knew how good Old Man Gao was to him.

Old man Gao taught him a lot of knowledge since he was a child, supervised him to take a medicinal bath every day, and after completing the apocalypse, he taught him the 'Shura Divine Technique' and the 'Taiyin and Yang Divine Technique', even if he had to leave, he would also leave the treasures of Yuan Jing, Lingyuan, and ancient books to himself, Gao Xuan already knew that Old Man Gao was not his own grandfather, but Old Man Gao's approach was already better than his own grandfather.

The fireball was still suspended in the wall hole, and Gao Xuan felt that the temperature of the wall hole had been raised again, but the temperature on the bitter hand was still so cold, Gao Xuan didn't dare to be careless, and increased the injection of Xuan Qi to make the fireball hotter.

Looking at the bitter words lying in front of him, Gao Xuan began to reflect on all his actions after entering the secret realm.

In the end, Gao Xuan found that he had done nothing wrong, the only mistake was that his cultivation was too low, so he dragged down Kuyan.

If his cultivation is strong enough, he will not let Kuyan fight alone, if Kuyan is not in a hurry to come back to save himself, Kuyan will not be injured at all, everything is caused by his lack of strength.

At this moment, Gao Xuan understood better why those senior brothers and sisters were so indifferent to him, in order to avoid the situation that Gao Xuan and Ku Yan were encountering now.

Participating in this mission has become a foregone conclusion, even if Gao Xuan regrets it, it is impossible to turn back time, what Gao Xuan has to do is to avoid this situation from happening again, and the only way to avoid this situation from happening again is to improve his cultivation.

Suddenly, Gao Xuan thought of the 'Amethyst Spiritual Essence' that he had dug up earlier, and said bitterly that the 'Amethyst Spiritual Essence' would be of great benefit to cultivators below the Heavenly Mind Realm, and refining it would help improve their cultivation without any side effects.

Under normal circumstances, it is impossible for Gao Xuan to quickly improve his cultivation, but with the 'Amethyst Spiritual Essence', everything becomes possible, although Gao Xuan does not know how much 'Amethyst Spiritual Essence' he can refine to help him improve his cultivation by the first level, but looking at the mountains of 'Amethyst Spiritual Essence' in the storage ring, Gao Xuan is full of confidence.

The method of refining the 'amethyst spiritual essence', Kuyan didn't tell Gao Xuan, and Gao Xuan didn't know, but Gao Xuan learned about the method of refining the elixir from ancient books, Gao Xuan didn't know if there was a connection between the two, but it was better to explore and try than to sit still.

After deciding, Gao Xuan began to take out a piece of 'Amethyst Spiritual Essence', preparing to try to refine it according to the method of refining elixir.

Holding the 'Amethyst Spiritual Essence' in his hand, Gao Xuan was finally able to take a closer look at its appearance, this is a hexagonal crystal that emits purple light all over his body, although it is only a small piece, but in his hand, it is extremely heavy, and it is not like the source crystal, the body contains the aura of heaven and earth.

The necessary conditions for refining medicine are elixir, Dan furnace, Danhuo, and alchemist, Gao Xuan is neither an alchemist, nor Danhuo and Dan furnace, and Gao Xuan is not a medicine refiner, but only uses the method of medicine refining to refine the 'Amethyst Spiritual Essence'.

As Gao Xuan's hands sealed, a Dan furnace formed by the condensation of Xuan Qi molecules appeared in the wall cave, and under Gao Xuan's control, the 'Amethyst Spiritual Essence' slowly moved and entered the Dan furnace.

The three most important steps in refining medicine are refining, sealing the furnace and forming pills, of which refining is the most critical step among these three steps.

The so-called refining, is to purify and smelt the elixir, to lay the foundation for the elixir, the purity of the elixir refining, directly affect the effect and grade of the elixir, now, Gao Xuan refining the 'amethyst spiritual marrow' method, is one of the methods of elixir purification.

Gao Xuan has not yet formed a Danhuo, but he has the 'Sun Divine Technique', the 'Sun Divine Technique' is a fire attribute mystical technique, and the fireball condensed through the 'Sun Divine Technique' has a higher temperature than ordinary flames, which is also the reason why the fireball in the sky can make such a cold environment warm.

Gao Xuan ran the 'Sun God Technique', and gradually, a beam of fire appeared on his index finger, and when he saw this flame, a smile appeared on Gao Xuan's originally gloomy face.

Under Gao Xuan's control, the flame in his hand detached from his index finger, like a fiery red elf, slowly moving towards the Dan furnace, and the moment it touched the 'Amethyst Spiritual Essence', the flames rapidly expanded, turning into a raging flame, completely enveloping the 'Amethyst Spiritual Essence'.

It's just that the Dan Furnace, which had just been condensed from the Xuan Qi molecules, seemed to be unable to withstand the temperature of the flames derived from the 'Sun Divine Technique', and it didn't take long for the Dan Furnace to shatter under the scorching flames.

However, this did not discourage Gao Xuan, the Dan furnace was gone, as long as the flame was not extinguished, and the 'Amethyst Spiritual Essence' had not been damaged, Gao Xuan would not be considered a failure.

After the Dan furnace was broken, Gao Xuan controlled the temperature of the flame more carefully, for fear that the 'Amethyst Spiritual Essence' would turn into powder under the smelting of the flame, and I don't know how long it took, Gao Xuan noticed that the 'Amethyst Spiritual Essence' gradually softened and turned from crystal to liquid, which made Gao Xuan feel uneasy.

Old man Gao once told Gao Xuan that elixir and spiritual liquid are powerful aids to help cultivators cultivate and improve, and after absorbing them, they can become nourishment for the body, helping Xuanjing split into more Xuanqi molecules, but ...... This method requires the consumption of too many elixirs and spiritual fluids, and ordinary people simply cannot afford such consumption.

Gao Xuan still remembered that Old Man Gao said that liquid is the easiest substance for the human body to absorb.

'Amethyst Spiritual Essence' is a solid crystal, which is inconvenient to absorb directly, and it is not like a source crystal, as long as the Heaven and Earth Spiritual Qi contained in the body is absorbed, so Gao Xuan spent so much time just wanting to liquefy the 'Amethyst Spiritual Essence'.

The hard work paid off, after so many times of caution, Gao Xuan finally liquefied the 'Amethyst Spiritual Essence', and the liquefied 'Amethyst Spiritual Essence', Gao Xuan called it the 'Amethyst Spiritual Liquid', and what Gao Xuan had to do now was to absorb the 'Amethyst Spiritual Liquid'.

This procedure is much simpler for Gao Xuan than liquefying the 'Amethyst Spiritual Essence'. Under Gao Xuan's control, the 'Amethyst Spiritual Liquid' quickly entered the body, and there were no accidents during the whole process.

Sure enough, after the 'Amethyst Spiritual Liquid' entered his body, Gao Xuan felt the huge energy brought by the 'Amethyst Spiritual Essence', which made Gao Xuan's whole body hot, and even the Xuan Qi molecules in the Xuanjing became restless.

However, this was not a bad thing for Gao Xuan, and soon, the 'Amethyst Spiritual Liquid' was completely absorbed by Xuanjing, and Gao Xuan also noticed that the number of Xuanqi molecules in Xuanjing had increased a lot.

During the whole process, Gao Xuan had mastered the temperature required for the liquefaction of the 'Amethyst Spiritual Essence', and also knew what things needed to be paid attention to in this process, and after gaining experience, Gao Xuan began to increase the amount of liquefied 'Amethyst Spiritual Essence', which could speed up his absorption of the 'Amethyst Spiritual Liquid'.

When the number of Xuan Qi molecules in Gao Xuan's body continued to grow, the storage of 'Amethyst Spiritual Essence' in the storage ring was also decreasing, and this process of reduction and increase lasted for three days unconsciously.