On this day, Zheng Dao walked to a mountain, which was not high but was lush and simple, and it seemed that it had not been cut down and repaired for many years. Standing on the top of the mountain, the scenery of the north and south is very different, the south of the mountain is an endless green mountain forest, but the north of the mountain is the yellow sand and no grass.

Zheng Dao carefully identified the direction and determined that Shanbei should be the legendary desolate land. Zheng Dao didn't dare to move forward easily, and he didn't know what the consequences would be if he stepped into the desolate land, but he still remembered his master's warning.

Zheng Dao did not go north, but returned to the mountains and forests and walked east along the mountains, the east side of the desolate land is the demon realm, as long as you walk in the direction of the east, you will definitely be able to find it.

Zheng Dao hurried unhurriedly, after these days of relief, his mood has improved a lot, and he also figured out that no matter how anxious he is, it is impossible for him to immediately become a top master, this lonely journey is what he must go, no one can accompany him, and no one can help.

Zheng Dao walked in this mountain forest, listening to the spring water, the birds and the warbler, suddenly felt a lot smoother, and the footsteps became lighter. He kept looking up to the left and right, and he didn't pay attention to his feet, and suddenly tripped over a branch and almost fell.

Zheng Dao suddenly said lightly, you know, with his current cultivation, not to mention a branch, even an iron rod is impossible to trip him, he can easily kick the iron rod off, but now he is almost tripped by a branch, how does this not surprise him.

Zheng Dao turned around and walked to the place where he had tripped up, because a thick layer of fallen leaves had accumulated on the ground, hiding the branches in it, and he couldn't see what it was. Zheng Dao gently picked up the fallen leaves, and what he saw disappointed him. Zheng Dao only saw a black thing that looked like a branch, I don't know what material it was, but there was nothing special about it.

The area of the fallen leaves was a little larger, and Zheng Dao finally confirmed that this was really a branch. But this branch is an extension of some kind of plant, the thickness of the forearm, the color is dark, and there is no sound when you knock it with your hand, but there is a sound of metal hitting it when you hit it with a stone. Zheng Daoton was surprised, and searched along the branches, and after a while, he found a tree with the same color as the branch.

This tree is not thick, the three of them can hug together, the color is still dark, Zheng Dao picked up a stone and knocked it on the tree, it still made a metal impact sound, and scratched it a few times with the stone, but it could not leave any traces.

Zheng Dao was puzzled, what kind of species is this? It is not wood, not stone, and it does not look like metal, but it looks like it is indeed a tree, but it does not have a leaf. Unfortunately, the Human Emperor is now in retreat and cultivating, so I can still ask him.

In fact, this is Zheng Dao's loneliness, if he knew what kind of species this is, he would definitely be ecstatic. This thing is the ancient ironwood sacred tree, not to mention in this world, even the entire continent is also a treasure that can not be found, this thing seems to have spirituality, it will not only grow in one place, nor only on the ground, it seems to be invisible, it is a once-in-a-lifetime opportunity to see it.

Moreover, this thing grows extremely slowly, and it may only grow a few centimeters in thousands of years, so the ironwood divine tree that Zheng Dao saw is definitely an ancient thing, otherwise it would not have grown so thick. This ironwood divine tree does not have any special ability, but this thing is extremely hard, if you can use the branches of this ironwood to create a weapon, it can definitely be called a divine weapon, and the broken rainbow sword on Zheng Dao's back can only be regarded as a rotten piece of iron in front of it.

Although I don't know what kind of species this is, but Zheng Dao's most basic judgment is still there, this is definitely not a simple thing, since I have encountered it, then I can't miss the opportunity in vain, Zheng Dao found a straight branch, it seems to be very suitable for building a long sword, grab the root of the branch and break it hard, Zheng Daoman thought that he could break this branch, but Tiemu did not move at all, not to mention that there was no broken gap.

Zheng Dao was unwilling to increase his strength, seven points of force, ten points of force, twelve points of force, Zheng Daozong used the strength of milk, but Tiemu was still uninjured and did not move. Zheng Dao really paid attention to it at this time, it seems that this thing is extraordinary, and he still has an estimate of how much strength he has now, but it is something that he can't help with all his might, and it is not simple.

Zheng Dao looked at the palm of the flesh, and the Broken Rainbow Sword Dragon on his back groaned out, holding the Broken Rainbow Sword Zheng Dao was a little difficult, seeing that the hardness of this thing is not ordinary, even if it is the Broken Rainbow Sword, it is not worth it, if he hurts the Broken Rainbow Sword, this Broken Rainbow Sword is a beloved thing given by the master, if it is destroyed by himself, how to explain to the master. But he was very unwilling to let him give up in vain, he took the Broken Rainbow Sword and looked at it for a while, and then looked at the Ironwood Divine Tree in front of him, Zheng Dao shook his head, and still took the Broken Rainbow Sword back into its scabbard.

Zheng Dao found a lot of thin stone chips with high hardness, picked up one and poured the internal force into it, and slashed it towards a thin branch of ironwood, this time because Zheng Dao poured the internal force on the stone chips, he still saw some effects, and the stone chips drew a shallow white mark on the ironwood branches, although there was still no big progress, but he still saw a glimmer of hope, Zheng Dao was a little overjoyed, and continued to operate according to this method.

Zheng Dao tried all his internal strength to fight against Tiemu on the stone chips, although the stone chips were very seriously damaged, often a stone chip has been worn away, and the iron wood has only deepened the white seal, but the more this is the case, the more it proves that this is a good thing, Zheng Dao also came to the bull's temper, and he will never give up if he doesn't get a few pieces of it, so he grinds it non-stop.

Because he wanted to cause a little damage to Tiemu, Zheng Dao had to pour all his internal force into the stone chips, so that the consumption of his internal force was very huge, often only cutting for half an hour, Zheng Dao had to rest for a while, meditate and rest to recover the internal force, and once the internal force was restored, he began to grind again.

After grinding endlessly for three days and three nights, Zheng Dao finally grinded a small branch off, and a large bag of stone powder had been piled up under the ironwood tree. The branch that Zheng Dao milled down was only about thirty centimeters long and the thickness of his index finger, which looked useless, even if he felt that it was inappropriate to build a dagger.

But Zheng Dao has his own use, he is not for experiments, he wants to use this twig to make a saw, Zheng Dao thought: Nothing else can help you, let your own things against yourself.