Under the earth, Gu Dong slowly lost his sense of direction as he continued to go deeper, and at this time he had gone deep into the ground and didn't know how deep, and he advanced with all his speed for half a day.

Stopped digging Gu Dong carefully felt the cross killing array above his head, and his mood was a little bad.

Shaking his head, the Gudong Holy Sword pulled out and slashed around, wanting to make a space to rest for a while.

The land was crisscrossed with huge stones and trees, which separated and disintegrated as Gu Dong's sword fell.

Click!

A crisp collision sound sounded in his ears, and there was a vibration in his right hand, and a flame appeared above Gu Dong's left hand, which immediately lit up the place in front of him.

In front of him, where the holy sword touched, a white mark appeared on the rhizome of a large tree.

This situation shocked him very much, you must know that the sword in his hand, let alone wood, can be said to be sharpened like clay against other weapons, but now it is directly blocked by a rhizome, and only a white mark is left.

Gu Dong was overjoyed in his heart, the secret path may have met a treasure, such a hard tree must not be ordinary.

Immediately evoked the sword soul, this tree that was harder than the holy sword might be the material for refining, Gu Dong couldn't let go of this opportunity.

"Just looking at this stem, in addition to the hardness, this is an ordinary tree......" Sword Soul also had some doubts in his answer.

It stands to reason that a tree of such hardness cannot exist, after all, this is wood, not an ore, only several divine wood sword souls also know it, but he has never seen this.

"No, you dig down, the problem should be ...... below"

The sword soul seemed to feel something and said to Gu Dong.

Gu Dong dug down without saying a word, and piles of dirt fell, forcibly pushed away by the martial arts outside Gu Dong's body, and as he continued to go deeper, Gu Dong's face began to slowly become strange.

This tree is getting thinner and thinner from top to bottom, and as it goes deeper, there is a trace of pure Yuan Power that begins to come out.

"That's right, there should be a dragon vein down here......" The voice of the sword soul suddenly appeared.

"Dragon vein?" Gu Dong was a little puzzled, he had heard of the name Dragon Vein for the first time in the Spirit Vein.

"The dragon vein is also a kind of spiritual vein, but the yuan power in the dragon vein is many times higher than the spirit vein, and it is said that if the dragon vein is too strong, the dragon ......spirit may be born," the sword soul explained to Gu Dong.

"Of course, this is all nonsense, the dragon clan in the world is probably no more than the number of hands now......" Sword Soul's voice suddenly became a little inexplicably low.

Gu Dong asked the Sword Soul about his future savings, and he felt that the Holy Sword was once again slashing in an incomparably hard position.

At this time, the hard tree was only the thickness of the palm of Gu Dong's hand in front of him, and the Gu Dong Holy Sword below the thickness of this palm could not move forward.

"This should be all his rhizomes...... Gu Dong said, using his sword to remove the soil from under the trees......

But as his movements fell, layers of dirt were peeled away, and cracks like eggshells were revealed under the rhizomes, and his eyes froze at the ancient Dongwu Domain, and all the debris above scattered to reveal the scene below.

A flat crystal wall was exposed in front of him, and the crystal wall emitted even more heart-shattering spiritual power fluctuations.

"This is the dragon vein branch......" Gu Dong stared blankly at the palm-thick branch in front of him, stuck in the crystal wall.

Click!

The Gudong Holy Sword stabbed out hard!

What was waiting for him was a loud bang, only to see the holy sword fly back upside down, and the force of the shock almost made Gu Dong throw the holy sword out......

"I know, face up to the fact that this ordinary tree is so hard because of this crystal wall, the tree is facing the sun, only the body of the tree is hard and it can get out of this place......" Sword Soul suddenly said to Gu Dong.

Gu Dong also looked thoughtful at this time, and nodded, the words of the sword soul were not contradictory, it was not so much that the trees pierced the crystal wall as the crystal wall forced the trees to grow and mutate like this.

"If you find a way to get into this, you should be able to gain something from cultivating." The sword soul stopped talking, and fell silent again.

Gu Dong looked at the crystal wall below, and his face was also happy, the fluctuation of the yuan force from this crystal wall was the only one he had seen in his life, and now he had a cross on his head to chase and kill countless people on the ground waiting to kill him, and now he found such a holy place of cultivation on the ground, he naturally wanted to practice.

But there was a huge problem in front of him, how to break the crystal wall and enter it......

"I'm afraid we can only start with the trees." Gu Dong quickly cleared out a place around him, and at this time, his feet were like transparent glass, and through the transparent crystal wall, Gu Dong could see the rich ribbon-like Yuan Force below.

No matter how hot his heart was, he could only surround this tree, which was now only the thickness of his palm.

Syllable!

Gu Dong tried again with a sword and slashed it, although the trees here were already very small, but there was basically no change in this sword hit, and the response of this tree was only strong and not weak.

Constantly walking around the tree, Gu Dong kept thinking in his heart.

"There is such a strong Yuan Force in this, as long as you can enter it, the breakthrough time will definitely be greatly shortened...... Then I'll be able to find a chance to fight back! Gu Dong secretly clenched his fists, and a spiritual light suddenly flashed in his heart.

Since the holy sword can't work, why not give it a try!

Suddenly!

A flame appeared in Gu Dong's right hand and then sprayed directly at the trees, the flames kept condensing and scorching the trees, and in the blink of an eye, a few hours passed, and a black line appeared on Gu Dong's face.

It's not that the flames have no effect on the trees, but after burning for a few hours, they only let the skin of the trees fall off, how can it be that they are only scorched for a while, and it will take at least a few months or even eight layers a year to burn off the palm-thick trees.

"If you want to enter here, you can only start from the gap made by this tree, and now it seems that you can only use the Nine Heavens Fire to solve this tree ...... within a month" Gu Dong's eyes showed a resolute look.

After speaking, Gu Dong rushed directly upwards along the rhizome.

This place is located underground, and it is obviously impossible to attract the Nine Heavens Fire, the only way is to go to the surface and use the Fire Phoenix Transformation to bring the Nine Heavens Fire down......

Along the rhizome of the tree, the more he went up, the more frightened Gu Dong became, as he advanced to the surface, the tree became thicker and thicker, and after a while, Gu Dong appeared on the surface, and the scene in front of him made him stand on the spot for a while.

A tree about twenty meters thick above the ground stood in front of him!

What attracted his attention was far more than that, but there were a few fruits in the canopy that covered the sky and the sun, and if it weren't for the ancient Eastern gods, it would have been difficult to find if they happened to come out of here.

"The target has appeared! Kill! ”

Before Gu Dong could react, two black shadows appeared around him, turning into streamers and rushing directly towards him.