This national scolding traveled through time and space, and it extremely accurately expressed Fang Xin's mood at the moment.

No matter how difficult the opponent was, he couldn't stop Fang Xin's progress, but the seemingly ordinary black iron box in front of him made Fang Xin feel like he couldn't start.

It's funny to say, a living opponent has not been able to make Fang Xin so difficult, but a lifeless iron box has made Fang Xin difficult.

Looking at the dark iron box that was close at hand, but it couldn't be opened, Fang Xin's heart was very melancholy, and when he thought that there were rare treasures in this iron box, Fang Xin's heart was even more melancholy.

This gave Fang Xin the feeling that a delicious food was placed in a jet-black container, and he could taste the aroma of the food inside, but he couldn't see, touch, or eat it.

This feeling made him a little crazy, but he was helpless.

The power of a single elephant could not open this dark iron box, and the full attack after opening the Heavenly Thunder Immortal Body already had the strength of close to two elephants, but it did not cause much damage to it at all, except for causing some white marks on the surface of the iron box.

"What the hell is this iron box made of?" Fang Xin looked at the dark iron box in front of him and let out a helpless sigh.

The difficulty of opening the dark iron box made Fang Xin retreat, and he thought in his heart that he might as well give up this iron box and go back to the Demon God Palace to hand in the task.

This negative thought only appeared in Fang Xin's mind for a second before he forcefully erased it, Fang Xin was not a person who gave up easily.

"I don't believe I can't open your little broken tin box today!"

Fang Xin's temper came up again, and it was better than the dark iron box, and he had to open it no matter how many means he tried today.

"Water Lock!" The demonic qi condensed, and Fang Xin pinched the technique to urge the technique.

Chains of flame entangled around the black tin box, and the scorching flames burned on the dark surface of the tin box with a 'crackling' sound.

As the minutes ticked by, the surface of the tin box remained intact until the flame chains faded away, showing the slightest sign of melting by the heat, but the color of the surface had become darker, which alone indicated that it had just been scorched by the flames.

"Fire is useless against it?" Thinking that the previous fire beasts and firefighters, as well as the flame chains released just now, had no effect on the dark iron box, Fang Xinxin couldn't help but have such a thought.

Since the flame has no effect, then use the power of thunder and lightning to split it, Fang Xin not only has the power of the flame attribute, the power of the thunder attribute is the most original power of Fang Xin, he has it since birth, it is his strongest strength.

The mark in his hand had just been pinched, Fang Xin seemed to remember something, stopped the movement in his hand, and looked up at the stone wall above his head.

"Bang!" In the next moment, Fang Xin's body suddenly jumped up, and a punch slammed into the stone wall above his head, the heavy and huge rock looked extremely fragile under Fang Xin's fist, and it was instantly disintegrated with just one punch.

"Whoa.." The shattered rock fell to the ground, and a beam of moonlight shone on Fang Xin's face.

The stone wall above Fang Xin's head had been pierced by him and connected to the outside.

Of course, Fang Xin didn't do this to see the moonlight, this was his preparation in advance for the stone wall on top to affect the power of his technique.

The technique that Fang Xin wanted to release just now was the strongest technique of his current single attack, the "Thunder Descending Technique", but this technique had great terrain limitations, although the thunder and lightning would break through the stone wall when it fell, it also affected the power of this technique.

In order to magnify the power of this technique, Fang Xin smashed through the stone wall above his head, so that the lightning could hit the dark iron box below.

All the preparations had been made, Fang Xin's hand pinched the magic trick again, and as Fang Xin's movements progressed, a dark cloud slowly gathered in the sky, and the thunder flashed in the dark cloud, and the thunder shook the sky.

This is Fang Xin's strongest single attack technique now, but summoning the thunder element floating in the air for his own use, a grain of thunder element does not have much power, but the thunder and lightning formed by hundreds of millions of thunder elements are not so small.

"Boom!" As the last action in Fang Xin's hand was completed, the accumulated thunder and lightning poured down in the dark clouds, and bombarded the dark iron box with unmistakable accuracy.

Fang Xin, who had finished performing the Thunder Descending Technique, let out a slightly heavy gasp from his mouth, looking at the dark iron box under the impact of thunder and lightning, and muttered, "I don't believe that this heavenly thunder can't split you yet." ”

After a few minutes, the lightning disappeared, the dark clouds drifted away, and Fang Xin's gaze was firmly fixed on the dark iron box in the pile of rubble.

Under the impact of such a violent thunderstorm just now, the stone platform that originally carried the black iron box was disintegrated in an instant, but the black iron box was still there, which was not unexpected by Fang Xin, but to Fang Xin's surprise, the black iron box was still the same as it was.

The only thing that has changed is that the surface of his iron sheet has become darker, and the dark red ornaments on it have become bright red, which is a little more mysterious than before.

Seeing this scene, Fang Xin couldn't help himself, so he rushed directly to the front and picked up the black iron box, knocked it twice, and felt that it was not much different from ordinary steel, and then not only let out a weak **: "What is this.."

"Can't you really open it?" Fang Xin put the dark iron box in his hand on a boulder next to him.

"Attribute fusion, thunder and fire strong fist!"

A punch mixed with scorching flames and crisp thunder and lightning struck the black iron box, but it still didn't react, it was still so stubborn and unwilling to be opened.

Fang Xin looked at the gap between the black iron box and the opening in the middle, as if he saw its mockery of himself.

"Mixed Yuan Halberd Method!

Taking out the Fang Tian Halberd placed in the space in his body, Fang Xin Shi displayed a killing move that he had comprehended in the Mixed Yuan Halberd Technique before.

A gilded cast word 'extinguish' formed in front of Fang Xin's dancing halberd, and after it was formed, it blasted straight towards the dark iron box.

"Boom!" the word 'extinguish' made a roaring sound on the dark iron box.

Fortunately, Fang Xin was in the depths of the Silver Mountain at this time, because of the existence of the bloody bandit group in the depths of the Silver Mountain, there were not many people passing by during the day, let alone in this dark night, otherwise the noise Fang Xin made during this time would definitely cause a large group of people to watch.

The gilded light dissipated, and the unscathed black iron box reappeared in front of Fang Xin, but the boulder below him shattered into stone slag in the impact.

Facing the scene in front of him, Fang Xin was already a little numb, and his methods were almost exhausted, but this dark iron box did not crack even a crack.

"Demon Source Refers to the First Designated Mountains and Rivers!" A giant finger carrying the power of mountains and rivers was pinched out by Fang Xin and crushed straight towards the black iron box that fell into the pile of rubble.

"Lei Yu.." Fang Xin, who cast the first form of the Demon Source Finger, did not stop, and was about to release the next technique, but found that the dark iron box was actually opened under the touch of a giant finger that carried the power of mountains and rivers.

Fang Xin hurriedly stopped his spell casting action in surprise, and with a force under his feet, he came to the dark iron box that had been opened.

Looking at the dark box that was opened, Fang Xin was a little puzzled, the first form of the Demon Source Finger was definitely not the most powerful one among the techniques he had cultivated, why did the previous attacks not work, and the dark iron box that was so difficult to open was automatically opened under the touch of the Mountain and River Finger?

For a while, a big question mark appeared in Fang Xin's heart.

However, at this time, Fang Xin couldn't think about these things, the dark iron box that might hide the secret treasure was finally opened by him, he still had to take a look at the items in the iron box first.

This treasure that made him curious was finally about to appear in front of him, what was this treasure?

Fang Xin couldn't wait to open all the half-open lids with his hands, and the contents completely appeared in front of his eyes.

A book.

The treasure placed in the dark iron box turned out to be a book, to be precise, this is a very simple book, picking up this animal skin book Fang Xin can even smell some moldy smell on it, this book must have been placed in it for a long time.

"Could it be that the Blood Tiger was looking for this book before?" Fang Xin took the ancient animal skin book in his hand with curiosity, opened the wordless cover, and turned to the first page of the ancient animal skin book.

"This is?!" Looking at the three words on the page, Fang Xin was so excited that he almost didn't hold the ancient animal skin book in his hand.

It's not that Fang Xin's mental ability to bear it is too weak, but the content recorded on the front page of this ancient animal skin book is really a little shocking to Fang Xin.

"Demon source finger. These three words are the three big characters written at the top of the first page of the ancient animal skin books.

This actually had the same name as the technique that Fang Xin had cultivated, this technique was a fragment of the technique found by the Demon Wind Tiger King in a ruin, and then it was taught to Fang Xin and Ape Gang.

Thinking of this, the doubts in Fang Xin's confidence could be solved, the technique placed in the dark iron box was the Demon Source Finger, and the dark iron box that Fang Xin had not been able to open before was automatically opened after Fang Xin performed the first form of the Demon Source Finger.

This must be because of the same origin, and only with the prescribed technique can this dark iron box be opened.

"Could it be that what is recorded in this ancient book of animal skins is the incomplete Six Forms?" After such a thought flashed in his mind, Fang Xin's heart instantly became hot, and he hurriedly continued to read.

"The demon source refers to the early stage techniques of the Xuan Rank, with a total of ten styles, which were created when I was looking at the original power of the demon clan, so the name is the demon source finger. ”

"Demon Saint Liu. ”

The content of this text made Fang Xin slightly surprised, the Demon Source Finger turned out to be created by the creator of the Demon Saint Cave, it was a big demon, the body was a Qilin who had mastered the fire attribute to the extreme, and his strength was strong, and the exercises he created would definitely not be too weak.

It's just that Fang Xin didn't expect that the full version of the Demon Source Finger would actually be a technique in the early stage of the Xuan Rank, which only made him a little excited.