Li Dong opened the jade box, only to see that inside the jade box was a pitch-black matchbox-sized clod, which looked inconspicuous, but the heavy earth attribute aura that came to his face could not hide it, and anyone knew that this clod of soil was a treasure.

"Wanhua Black Thunder Mud?" Li Dong asked Master with some uncertainty.

"Good eyesight!" Cao Qianhe exclaimed, there are hundreds of types of soil, many of them are very similar in appearance, it is difficult to identify, Li Dong has never seen soil before, but he can see at a glance that this not only requires amazing memory, but also requires smart eyesight.

Wanhua Black Thunder Mud is an earth-based spiritual creature that has been transformed by more than 10,000 years after countless lightning baptisms.

In the "Five Elements Spirit Spectrum" Xitu chapter, there is a relevant introduction to the Wanhua Black Thunder Mud, more than 10,000 years is the yellow level, more than 100,000 years is the Xuan level, more than 100,000 years is the earth level, and more than 10 million years is the heavenly level.

The Wanhua Black Thunder Mud in the jade box is a Xuan-level lower grade, and it is speculated that the year when it has been refined by the Heavenly Thunder should be between 100,000 and 300,000 years.

Now that all kinds of spiritual materials for refining the Twelve Heavens Gas Cylinder have been prepared, Li Dong can't help but want to refine this magical Twelve Heavens Gas Cylinder as soon as possible.

After confessing to his master, Li Dong couldn't wait to return to his courtyard to prepare for the retreat, of course, before the retreat, he greeted Sun Mengzhu and Song Xiaoxue in advance, and arranged a formation in the courtyard.

The furnace used by Li Dong for refining is obtained from Lan Fei's trophies, and the high-grade furnace is an upgraded version of the medium-grade furnace used by Li Dong before.

Open the furnace, place the fire, add spirit stones, and open the furnace formation.

The main material for refining the Twelve Heavenly Cylinders is the Void Exquisite Jade, the Void Exquisite Jade is the top-level spiritual material, and it is the spiritual material necessary for refining the invisible magic weapon, which is extremely difficult to see in the Fang City, Li Dong has been to many Fang Markets, and he can't find the Void Exquisite Jade at all.

However, Li Dong already has a void exquisite jade on his body, that is, a jade box containing the twelve Tianna gas cylinders and jade slips, maybe the predecessors who left this jade slip know that the void exquisite jade is more rare, so they deliberately use the void exquisite jade to create a jade box, not only passed down the instrument spectrum, but also prepared the main materials, this is really a careful and considerate predecessor.

The refining of the twelve Na Tian gas cylinders is very different from the refining of general magic weapons, it needs to refine twelve Na gas cylinders first, and carve a large number of Qi gathering arrays and gas arrays in the twelve Na gas cylinders, and then refine a array disk, connect the twelve Na gas cylinders with the array disk, and return to the furnace for refining, and the final refining array is the formed Twelve Du Tian Na gas cylinders.

Li Dong's refining level is not very high, he rarely refined magic weapons before, but now he is a Dao Seal Great Perfection cultivator, and the majesty of the True Yuan mana can be compared with the Dao Great Perfection cultivators, even if he rarely refines magic weapons, he is confident that he can refine high-level magic weapons, so refining the Twelve Heavenly Cylinders should not be a problem.

Li Dong threw the Void Exquisite Jade Box into the furnace, and three days later, the Void Exquisite Jade Box turned into a crystal clear transparent jade liquid, Li Dong's divine sense sank into the furnace, and the transformation array of the control furnace condensed the transparent jade liquid into twelve small jade bottles, and continued to refine for three days.

The twelve transparent glass-like gas cylinders were finally formed, Li Dong opened the furnace, took out the twelve glass bottles, and began to carve the formation in the glass bottles.

Qi Gathering Array and Qi Transformation Array are all common formations, like this method of carving the formation in the magic weapon is called condensation, the higher the level of prohibition of the monk, the stronger the power of the magic weapon refined.

Li Dong's forbidden manufacturing attainment is not low, and now it has the level of fourth-order prohibition.

As mentioned above, the so-called prohibition is the foundation laid by the monk with the true element mana as the root and the divine consciousness as the guide.

The level of prohibition is determined by the number of forbidden patterns, one to thirty-six forbidden patterns belong to low-level prohibitions, thirty-six to three hundred and sixty forbidden patterns belong to medium-level prohibitions, three hundred and sixty to three thousand six hundred forbidden patterns belong to high-level prohibitions, and more than 3,600 forbidden patterns are immortal prohibitions.

Orders 1 to 3 are low-level prohibitions, orders 4 to 6 are medium-level prohibitions, and orders 6 to 9 are high-level prohibitions.

Nine is the extreme, and above the ninth-order prohibition is the immortal forbidden, which is a realm that can only be touched by immortals.

Li Dong's current prohibition is enough to have one hundred and sixteen forbidden lines, and the fifth-order prohibition is one hundred and twenty forbidden patterns to two hundred and forty forbidden patterns, and Li Dong's prohibition level is only one line away from the fifth-order.

The prohibition is the basis of the forbidden array, and the multi-layer prohibition can be superimposed together to form the forbidden array, to make a simple analogy, assuming that the prohibition is a line, so many lines are combined together to form a figure, triangle, quadrilateral, pentagonal or something called the forbidden array.

The difficulty is the number of forbidden arrays that can be depicted on a magic weapon, the internal space of the magic weapon is limited, and the more forbidden formations are depicted in a limited space, the stronger the power will be, which requires the consumption of the monk's true yuan mana to condense the forbidden array as much as possible, which is the so-called subtlety.

Li Dong depicted forbidden formations in one gas cylinder after another, and with his current strength, he could only depict four forbidden formations at most in one gas cylinder, two qi gathering arrays, and two qi transformation arrays.

It took Li Dong a total of six days to depict the twelve gas cylinders, and after completing these, Rao is Li Dong Zhenyuan mana is deep and a little unbearable, the consumption of Zhenyuan mana is too great, Li Dong rested for a day to meditate and breathe, and restore Zhenyuan mana.

A day later, Li Dong Zhenyuan's mana was exhausted, and he began to refine the array disk, Li Dong had a lot of materials for refining the array disk, and almost all the materials for refining the array disk in the cultivation realm were dream crystal dew.

Dream Crystal Dew is not a liquid, but a special kind of jade, this kind of jade has excellent continuity, known as ever-changing, and after the monk is excited by the true yuan mana, it can be magnified thousands of times in an instant.

The base of the formation is Zhou Tian Xing Dou Formation Base, which is also a relatively common formation base, Zhou Tian Xing Dou Formation Base has multiple formation eyes, and multiple array flags can be placed.

It only took Li Dong half a day to complete the refining of the array disk.

Generally speaking, the miniature array includes three main components, which are called the three elements of the miniature formation in the classics, namely the array plate, the formation base, and the array flag.

The most critical of the three elements is the formation flag, which is directly related to the power of the formation.

Although Li Dong needed a formation plate to refine these twelve Tianna gas cylinders, he did not need a formation flag, and the twelve gas cylinders were equivalent to the array flags, occupying twelve directions in the order of Zhou Tian on the array plate.

Li Dong inlaid twelve gas cylinders on the array plate and returned to the furnace to start the second refining.

This kind of formation is not like a formation, and the magic weapon is not like the formation of the magic weapon, which is extremely cumbersome to refine, and has extremely high requirements for the monk's true yuan mana and divine sense.

Li Dongqiang fought his spirit, and he didn't dare to be careless at all, because the next step was the most critical step, integrating into the Five Elements Spiritual Object.

The order of adding the five elements of spiritual objects can not be made in the slightest error, earth, wood, fire, metal, water, the five elements of spiritual objects are added in order of mutual growth and mutual restraint.

The first thing Li Dong added was the Wanhua Black Thunder Mud, which was the lower grade of the Xuan Rank, and after adding the "Wanhua Black Thunder Mud", he continued to refine for three days, and Li Dong's divine sense could see that the color of the twelve gas cylinders in the furnace had changed from the original transparent color to pitch black.

The second addition was the Xuanjie-grade Immortal Spring Wood, which continued to be refined, and after three days, the twelve gas cylinders turned into black and green.

Then there was the Azure Flame of the middle grade of the Xuan Rank, which was refined for three days again, and the gas cylinder became black, green, and red.

Followed by the Ruyi gold essence of the lower grade of the Xuan Rank, which continued to be refined for three days, the gas cylinder became black, green, red, and gold.

Finally, there is the heavy Xuanzhen water of the lower grade of the Xuan Rank, and after three days, the twelve gas cylinders have become black, green, red, gold, and blue.

At this time, Li Dong Zhenyuan's mana consumption was too great, his face was pale, his eyes were full of bloodshots, the bones of his whole body seemed to be about to fall apart, his muscles were sore, and an indescribable feeling of tiredness spread from the sea of divine souls to the meridians and points of his body.

Monks are also human beings, not machines, and the high-intensity and high-frequency use of divine consciousness and true element mana without sleep has reached the limit of the body's load, which has affected the origin of the divine soul, so the divine soul sea will issue a warning.

That's what makes you physically and mentally exhausted!

However, the refining is not over yet, it can't be stopped at this time, once it stops, all the previous efforts will be in vain, and all the cherished spiritual materials will be wasted, Li Dong really can't get together a copy of the materials for refining the twelve Tianna gas cylinders again.

There is no way, even if the origin is damaged, it has to continue, for the sake of the mountain, Li Dong can't bear such a huge loss, not to mention that he also promised Sun Mengzhu to help her solve the problem of too slow cultivation, without the twelve Tianna gas cylinders, how can he do all this?

So, never give up!

Li Dong gritted his teeth, overdrew his physical strength and spirit with great perseverance, and continued to refine for three days, and the base array of the twelve Tianna gas cylinders also became the same five-color as the twelve bottles.

A burst of "buzzing" sound came from the furnace, and Li Dong knew that the "Twelve Tianna Gas Cylinders" had been formed and could be opened and retracted.

It took Li Dong a total of twenty-eight days to refine the weapon this time, and it was too great a test of his divine sense and true yuan mana, and it was also a loss that his true yuan mana recovery speed was faster than ordinary people, otherwise any Dao cultivator would not be able to persevere.

This is not a magic weapon that can be refined by Dao cultivation at all, at least it must be that Dao True Monarch has the strength to refine it, Li Dong didn't expect that refining the Twelve Heavenly Gas Cylinders would be so difficult before opening the furnace refining tool, and he almost gave up his efforts.

The predecessor who left the jade slip is really too tricky, can't you leave a sentence in the jade slip, "Refining this array requires Dao Fruit to be cultivated above"? That way, buddy should be mentally prepared, so as not to make such a mess!

Li Dong doesn't have the energy to open the furnace and collect it now, his energy consumption is too great, but the magic instrument has been formed, and it doesn't matter if the furnace is opened and collected later, generally as long as it is not more than three days, it will not affect the quality of the magic weapon.

Li Dong sat down on the spot to meditate to regain his vitality, and this meditation was two days and two nights.

Two days later, Li Dong Zhenyuan's mana was exhausted, but the deficit of the divine soul origin could not be recovered in the short term.

Now, the Twelve Tina cylinders have been formed, and only one last step remains, ignition!