At the exit of this 'hole', the pitch-black demonic qi that erupted from the mouth of the 'hole' was pulled by a strange magic circle and poured into a forbidden array next to the mouth of the 'cave'.

Within that forbidden array, there was not only a pitch-black demonic aura, but also a large amount of dark green 'color' poisonous mist. On the ground inside the forbidden array, there was even a thick layer of poisonous spiritual materials.

A strange tree with a strange bowl mouth grows in this forbidden array. The strange tree's face was dark green, and there was a thick demonic and poisonous gas on it. When I looked closely, I saw that the strange tree, which was less than three zhang high and had no branches and leaves, was full of strange golden-shelled monsters the size of human heads.

The golden-shelled monster insects all had strange mouthparts that were nearly two feet long and dark green, and they looked indescribably terrifying. However, these strange insects seem to be clinging to this strange tree and dormant now.

This tree is a well-known magic copper tree in the immortal cultivation world. This kind of tree is similar in appearance to a copper pillar, with no branches and leaves, only a trunk, and its appearance is similar to that of rusty bronze. As long as it has poisonous nutrients and demonic energy, it can grow. This tree is also known as the "Immortal Tree". This kind of tree can be seen in the tombs of many demon cultivators.

This "Immortal Demon Tree" is said to make the demon cultivator's 'flesh' body incorruptible and soul immortal, so that it can always maintain the state it was in before death, and enter a state of suspended animation that seems to be dead but not dead. They hope that one day there will be a resurrection.

It's a pity that the Heavenly Dao Cycle, how can it be done by manpower? These demon cultivators' wishful thinking planted a large number of this "immortal demon tree", but they inadvertently developed another strange use of this kind of demon tree.

It is said that the first demon cultivator to implant this "immortal demon tree" into the tomb 'cave', ten thousand years after his death, actually gave birth to a very strange demon corpse worm in his body, this demon corpse worm especially likes to parasitize on this "immortal demon tree", and sucks the demonic poison on this tree every day, and slowly grows into an "undead demon worm". This "Undead Demon Worm" is very peculiar, even if you kill it, even crush its insect corpse into powder and burn it to ashes, it can also be resurrected with a trace of breath attached to the "Undead Demon Tree". This is a veritable "undead insect".

However, it is a pity that many people want to cultivate this "undead demon insect", but they are all in vain because they cannot cultivate a 10,000-year-old "undead demon tree".

Wu Yan also found a root of this "Immortal Demon Tree" when he inadvertently rummaged through the poisonous spiritual materials given to him by Zhu Jun's 'jade'. During this retreat, Wu Yan thought of the strangeness of this tree, and couldn't help but be moved, so he planted such a tree next to the 'hole' of the demonic land. Anyway, there are a lot of nutrients in the poisonous spiritual materials, and the demonic qi in this 'hole' is also becoming more and more abundant, and all kinds of conditions are satisfied, plus he has the fairy spirit green loam soil in his hand, which can give birth to the age of the tree, so he thought, why not take this opportunity to cultivate his one hundred and ten mutant Heaven Devouring Worms into undead insect bodies, then wouldn't it be even more powerful in the future?

What Wu Yan didn't expect was that after these one hundred and ten Sky Devouring Insects were attached to this tree, it only took less than ten years to successfully melt the breath of the insect body into the Undead Demon Tree. As long as you continue to grow in this attachment for a few years, you will surely achieve immortal body, and you can hope to succeed. What's even more strange is that this Heaven Swallowing Worm, after such cultivation, has successfully advanced and matured in just twenty years.

Now, one hundred and ten Sky Swallowing Worms, all of them have matured. After maturing the swallowing insects, after 'mating', all the male insects have been swallowed by the females. And the female worm, which devoured all the male worms, also entered the dormant period this time. When it wakes up, it lays eggs. As for what will happen to the female worm after laying eggs, Wu Yan is not clear.

Now, this "Immortal Demon Tree" is already a mature body of 10,000 years old, and there is no need to ripen it anymore. With the current state of this tree, Wu Yan can take away the cultivation of the magic treasure at any time.

With such a magic treasure in his hand, the Sky Swallowing Insect whose breath is attached to it, even if it is killed by someone in the fighting method, it can be resurrected on this magic treasure at any time.

However, now that these Sky Devouring Worms have not yet laid eggs, nor have they completely achieved the body of the undead insects, he is naturally not in a hurry to refine the body of this "Immortal Demon Tree" into a magic treasure and collect it in the Blood Mansion.

Seeing that the more than fifty Heaven Devouring Mother Worms didn't seem to have the slightest sign of awakening, Wu Yan left the forbidden formation.

Returning to the usual place of meditation and cultivation, Wu Yan slept for a few days, and when the 'essence' spirit was restored to the best state, Wu Yan meditated on the method and process of refining the magic weapon of the Shenzhen Iron Flying Sword several times, and then took out the materials and utensils of the array, and began to arrange them within a radius of ten zhang around his body.

Half a month later, a special Gathering Spirit Forbidden Array was arranged. Within this Gathering Spirit Forbidden Array, four strange pillars of light the thickness of buckets surrounded the big stone where Wu Yan was sitting cross-legged, illuminating the entire island as if it were day.

After doing this, Wu Yan slapped the green cow bag and took out the fist-sized piece of Shenzhen Iron.

Wu Yan took a deep breath, and a magic trick hit the divine treasure iron.

With a burst of blue light, the Divine Iron floated not far in front of it. Wu Yan then opened his mouth and spewed out a faint blue Dan fire.

With the guidance of its magic technique, the Dan Fire began to calcine and refine when it wrapped the divine iron floating in the blue light.

It's just that, the weird thing is that the whole Shenzhen Iron is black and black, and it is constantly scorched by the dark blue 'color' Dan fire, but it has never changed at all. Moreover, on top of the divine treasure iron, a layer of undetectable black light was faintly released, isolating the faint blue Danhuo.

Wu Yan seemed to have expected this situation a long time ago, and he was not anxious, letting the dark blue Dan fire continue to burn the divine treasure iron, once he saw that the fire of the Dan Fire was slightly weaker, he immediately opened his mouth again and spewed out a dark blue Dan fire, supplementing its fire.

The complicated recipes were also burned with the Dan Fire, and they were constantly hit on the Shenzhen Iron that was wrapped in the Dan Fire.

The consumption of mana by this dark blue Dan Fire is very huge, so while Wu Yan is constantly calcining the Divine Treasure Iron with Dan Fire, he will take out some pills that replenish mana to take.

In order to condense the magic weapon, he has also opened the furnace again to refine a lot of pills in the past twenty years, which is enough to support the entire condensation process.

More than ten days passed, and the Dan Fire had exhausted the scorching power of the layer of black light wrapped around the Divine Treasure Iron. The Divine Iron was also burning for a while, faintly beginning to turn red and shiny, and then began to melt into a trace of fiery red 'color' liquid.

More than ten days passed, and the entire Shenzhen Iron was completely melted into red 'colored' iron juice.

Wu Yan wiped the hot sweat on his head, and without stopping, he continued to spew out the faint blue 'color' Dan fire, wrapping the red 'color' of iron juice to keep it in this state.

At the same time, he began to play one after another incomparably complex spells, and one after another filaments of spiritual energy were injected into the iron juice from the spell, pulling the iron juice to begin to change shape according to the shape of the flying sword.

Wu Yan's face was calm, and he continued to use the magic trick to pull the sword blank formed by the iron juice to elongate and flatten, and 'make' the appearance of the metal 'sex' flying sword exactly the same as that recorded in the "Five Elements Sword Codex".

A few hours passed, Wu Yan casually grabbed two Qi Replenishing Pills and threw them into his mouth, but his eyes stared at the small fiery red 'colored' flying sword floating in front of him without blinking, and when it finally formed a slender flying sword like a sharp cone that was exactly the same as depicted in the Five Elements Sword Codex, he breathed a sigh of relief.

Then, Wu Yan bit the tip of his tongue and squirted out a mouthful of 'essence' blood, which condensed into two blood lines in the face of the year. Wu Yan pointed his finger in the air, and the two blood lines rushed to the front and back of the fiery red 'colored' little sword.

As soon as the two blood lines touched the small sword, they did