With Yun Fei's current cultivation, the seven or eight undead below were no threat to him, and the most powerful one was only the strength of the peak of the late stage of the Little Spirit Heaven Realm, and moreover, these undead did not have any wisdom, only killing.

The only thing he was worried about now was if there were other undead behind them, or if there were any necromancers. Once the undead grow into an undead master, his strength is equivalent to that of a strong man in the early stage of the Condensing God Realm, and it is still a huge threat to him, so he can't be cautious.

Yun Fei's eyes rolled, and he had a plan, and a leaf shot out, heading straight for one of the undead.

"Roar..."

Although these undead have no intelligence, their instinctive reaction to danger still exists, so when they saw the blade flying, the undead reacted quite quickly, threw the short knife in his hand violently, and went straight to the blade with a sharp sound of breaking through the air.

At the same time, the remaining few undead rushed towards the ancient tree where Yun Fei was hiding, and their mouths let out a roar of non-human and non-beast, which was extremely piercing, and the blue flames in their eyes burned even more vigorously.

"Bang!"

Almost at the same time, the blade collided with the short knife, but as soon as it came into contact, the short knife was knocked out by the blade, spun and plunged into the ground, but the leaf only froze, and rushed away at the undead again.

"Click..."

The strength of this leaf was tens of thousands of catties heavier than the previous tentative leaf, and the humanoid skeleton couldn't withstand the strong force at all, so it immediately flew out sideways, and the parts below the skull, under this blow, all shattered into countless pieces.

However, the undead did not die there, even though there was only one head left, it still flew into the air, the blue flames in its eyes became even more intense, and it roared angrily and rushed towards the ancient tree where Yunfei was.

Looking at the seven or eight undead who rushed over, Yun Fei was not afraid, his palm shook, and countless leaves were used as secret weapons by him and thrown out, and in an instant, the seven or eight undead had broken bones and tendons, leaving only one head.

It's not that Yun Fei doesn't want to kill these undead, but what surprised him was that the leaves blessed by it weighed tens of thousands of catties, but when they hit their heads, they made a metallic crashing sound, only knocking those heads away, not shattering them.

This discovery shocked Yun Fei's heart, although he didn't do it personally, but those leaves carried his power, even a spiritual cultivator in the late stage of the Little Spirit Heaven Realm in the true sense, he didn't dare to resist so hard, but the undead was good, but he didn't have any scars after resisting.

"It's weird!"

Yun Fei raised his eyebrows, the attack continued, and more leaves smashed over, but at this moment, a vision suddenly appeared, and the seven or eight heads quickly gathered in one place, as if they had generated a spiritual intelligence in an instant, and the blue flames in their eyes erupted, forming a blue flame net in the void, and shrouded the ancient tree where Yun Fei was.

The moment the blue flame appeared, the temperature of the entire space rose rapidly, and it was visible to the naked eye that a small puddle of water instantly turned into water vapor and was evaporated under this high temperature.

The moment the blue fire net covered the ancient tree, it turned it into ashes, leaving nothing behind, and Yun Fei had already taken the first step and flew away from the ancient tree, although the speed of the fire net was fast, how could it be compared to the Nine Dragons Transformation Technique, naturally Yun Fei could not pose the slightest threat.

Yun Fei was suspended in mid-air, coldly glanced at the seven or eight skulls, and then shifted his gaze to the black pool, because just now, his powerful perception found a black shadow hidden in the pool, although it was very vague, he could conclude that there was an existence hidden in the pool, but the strength was unknown.

When the skull saw Yun Fei appear, he howled and went straight to Yun Fei, and his speed instantly increased several times, but in Yun Fei's eyes, although the speed of these skeletons was fast, the trajectory of their flying was clearly reflected in his mind.

"Whoosh!"

Yun Fei moved, he decided to shoot directly and kill these undead, after all, even he didn't dare to touch the blue flame, just now, he communicated with Ling'er, the ghost fire in the eyes of those skeletons was actually a kind of ghost fire, although the grade was not very high, but it was not something that the physical bodies of these spiritual cultivators could resist.

Even if Yun Fei's body was strong, it couldn't withstand the calcination of this flame, so when these skeletons flew over and were about to spew out blue flames, Yun Fei took the first step.

"Click..."

There were seven or eight crisp sounds in succession, and the remaining heads of the undead exploded under Yun Fei's fist, leaving no drops, and only a few blue flames were left in the void, which were condensed into a ball of fire by the white light that rushed out of Yun Fei's body, and it was collected inside.

Although the ball of fire was only the size of a thumb, as soon as it approached Yun Fei's skin, the tingling sensation was transmitted instantly, and this was still under Ling'er's control, otherwise, with his current physical strength, he really wouldn't dare to touch this ghost fire.

The subordinates were killed, and the black shadow hidden in the pool did not attack, and there were signs of taking the opportunity to slip away, discovering this situation, Yun Fei immediately made a decision and slapped it with one palm.

Zhang Xu's huge palm fell, the black pool was destined to cease to exist, the reason why Yun Fei dared to do this was also based on Ling'er's reminder, after all, the current Ling'er was also a cultivator of the Condensation Realm, although she did not have a physical body, it did not affect her release of her divine sense.

Ling'er found that the black shadow hidden in the pool was not an undead master in the Condensing God Realm, but something that looked similar to a demon beast, and its strength was only equivalent to the early stage of the Little Spirit Heaven Realm, which was also the reason why Yun Fei dared to directly face those skeleton undead.

"Bang!"

Before the big hand transformed into spiritual power fell, the black pool immediately splashed with a black wave that was a few feet high, and then, a black shadow shot out from it, and, at the moment of sprang out, it was about to drill into the yellow soil.

"I'd like to see what the hell you are!"

Yun Fei chuckled, naturally he would not let the black shadow escape, Zhang Xuda's palm suddenly changed direction, and grabbed the fleeing black shadow.

"Whew!"

The black shadow was unwilling to be restrained, and spewed out an arm-thick column of water from the wrapped black liquid, heading straight for the palm of the spiritual power, but the black water took the opportunity to slip away.

Yun Fei, who was bent on taking down the contents of the black water mass, wilted to make it do what he wanted, and with a flick of his other hand, a silver-white arc of lightning shot out and ran towards the black water.

"Bang!

Two collisions sounded, and the black water column was smashed with a palm, but the black water mass was shot out by the arc, and the black water wrapped in it was completely killed, revealing the true face of the thing hidden in it.

It was a small beast with black hair, only the size of a human head, and its two eyes were rolling around, and it was held by the big hand of spiritual power, looking terrified.

However, there was something in its mouth, Bai Yingying emitted fluorescence, when Yun Fei saw the thing in the mouth of the little beast, his eyes shrank sharply, and he held his palm, and the black little beast only had time to let out a wail, and was killed on the spot, and the thing in its mouth fell into Yun Fei's hands.

When he first caught the little beast, Yun Fei didn't plan to kill it, but when he saw its triangular eyes, which were originally dark green, instantly turned blue, Yun Fei knew that this guy was deliberately showing weakness, so that he would no longer be guarded.

It's a pity that although this little beast is a little cunning, how can it escape Yun Fei, who is always watching it, so as soon as he found this sign, Yun Fei immediately decided to kill it.

Looking at the things in his hand, Yun Fei frowned slightly, and hurriedly took out the bone key obtained in the trial secret realm from the space, the two bone keys were lying quietly in the palm of his hand, no matter the color and material were very similar, but the perforations on the bone keys were different, and now he was very sure that these two bone keys were likely to come from the bones of the same kind of demon beast.

And from their system, these two bone keys are likely to be the keys to open a certain place, but now it is not known where these two bone keys can be used or where they are the keys.

He once asked Ling'er to check the bone key, wanting to guess what kind of demon beast it belonged to, but unfortunately, Ling'er didn't judge it, and there was no better suggestion for this, so the first bone key stayed quietly in the space, and as a result, he didn't expect to get the second bone key on the first day of entering the ancient battlefield, which made him surprised and a little puzzled.

After pondering for a while, Yun Fei put the two bone keys into the space, flipped his palm, and a palm-sized white jade appeared in his hand, and the spiritual power was instilled into it, but there was no change in the slightest, which made him frown.

"There is no same door within a radius of fifty miles, and it seems that it is separated by some kind of law in space. Yun Fei muttered to himself, glanced at the psychic jade in his hand, put it away as soon as he turned his palm, and then put away all the black snake grass, and then chose a direction to fly away.

Tongling jade is a token that can contact the same door, as long as there is the same door holding the same thing, it can be sensed within fifty miles, before leaving, Qin Yifan did not favor one over the other, everyone sent a piece.

As for him taking away the black snake grass, it was naturally to refine the poison pill, which was not only a means of saving his life, but also the only way for the Yin people.

Although Yun Fei had other means to save his life, in this ancient battlefield, one more means would give him one more chance of survival, after all, with his current cultivation and strength, he could only be regarded as inferior.

After all, the people who entered the ancient battlefield, in addition to the spiritual cultivators, there were also people of other races who also entered it, and he didn't dare to be careless.

While flying, he checked the psychic jade in his hand, but unfortunately, after flying for hundreds of miles, the psychic jade did not react in the slightest, if it weren't for Qin Yifan's words that this thing could help them find the same door, Yunfei really suspected that it was a dead thing.

After flying forward for more than two hundred miles, a few red dots finally appeared in the psychic jade in his hand, but these red dots moved very fast, and they just appeared in the psychic jade, and the next moment, the red dots of light suddenly disappeared from the psychic jade.

This time, Yun Fei was quite puzzled, and without hesitation, he swept forward, judging from the speed at which the red light disappeared just now, there must have been a fellow door in trouble, otherwise, the speed of movement would never be so fast.