Yu Xiao's face changed greatly, he only felt that his scalp was numb, and there was a hint of horror in his eyes, if he was surrounded by this group of blood fairy insects, the end would definitely be very miserable.

He had also seen how powerful this mutated Blood Immortal Worm was before, not only was it powerful, its teeth were sharp, and it was more aggressive, but it was also thick and thick and not afraid of flames, and it was not easy to kill them.

What's even worse is that once these blood fairy insects set their sights on a target, they will not give up easily, and he never expected that there are so many mutated blood fairy insects here.

"Damn it!"

Yu Xiao secretly scolded in his heart for being unlucky, and he didn't have time to think about it, so he directly sacrificed the Black Ding, and the latter's size skyrocketed several times, sprinkling Dao Xia light to block the approach of the blood fairy insects.

However, this magic weapon can still have a good killing effect in the face of ordinary blood fairy insects, but it has almost no effect in the face of that group of crazy mutant blood fairy insects.

Those rays of light shining on the blood fairy insects only made them let out a few screams, and a few wisps of white smoke came out of their bodies, but they couldn't directly kill them.

Moreover, the blood fairy worm will become more ferocious after eating pain, its eyes are full of scarlet, and the clanging sound of a pair of large jaws colliding is like a meat grinder with full horsepower.

Seeing that Hei Ding couldn't stop the Blood Immortal Worm, Yu Xiao decisively sacrificed the sword diagram again, and hundreds of black and white swords burst out in mid-air with dazzling sword light, slashing down one after another at an extremely fast speed.

When the sword light fell, the blood fairy insect was attacked quite a bit, and there were many more scars on its body, and its movements became a lot slower.

However, after a while, those blood fairy insects began to bite the black and white swords frantically, just one of them, and the black and white swords fell a large piece with a swish.

Seeing that the situation was not good, Yu Xiao dared to stay anywhere, and immediately put all the small swords into the sword diagram, turned around and ran.

However, the Blood Fairy Worm did not intend to let him go, the speed soared, and the earth-shattering sound of the wing fan was soon approaching, and Yu Xiao could even feel the fierce wind passing overhead, and his mood sank to the bottom in an instant.

At this time, an eager voice came from the side: "Fellow Daoist, it's safe here!" Come here! ”

Hearing the sound, Yu Xiao saw a strange ancient tree not far away, and there were three people standing below, surrounded by spiritual power, as if there was some kind of formation enchantment, and at this moment, one person was waving at him.

Seeing that the blood fairy insects in the rear were about to catch up, he didn't have time to hesitate, and immediately turned around and galloped towards the strange ancient tree.

It was too late, and it was fast, as soon as Yu Xiao's front foot arrived, the blood fairy worm in the back had already fallen.

Fortunately, the three of them had prepared in advance, one of them twisted the trick to open the enchantment prohibition in front of him, let Yu Xiao in, and the other two sacrificed magic weapons to delay the pace of the blood fairy worm.

After Yu Xiao entered the enchantment, the man immediately fell the prohibition and closed the enchantment, and the blood fairy worm failed to succeed, and was very angry, letting out a squeaky roar, and frantically attacking the enchantment.

But the enchantment in front of him was very strong, no matter how the blood fairy worm attacked, it failed to have any substantial effect, and after some tossing and turning to no avail, the blood fairy worm flew away very unwillingly.

At this time, the three of them breathed a sigh of relief slightly, and Yu Xiao was also a lot more relieved, it seemed that this place was indeed safe.

He immediately looked at the people present, his eyes fell on one of them, and he couldn't help but be a little surprised: "It's you!" ”

Among the three of them, there was a personable man in white, who was Mu Yunqian, the young master of the Phantom Spirit Gate.

The two people beside Mu Yunqian were both disciples of the Phantom Spirit Sect, and the three of them seemed to have been here for a while, their faces full of sorrow.

"It turned out to be a Taoist friend of the Fuguang Sect, disrespectful and disrespectful." Mu Yunqian replied politely, he didn't underestimate Yu Xiao's cultivation because he was lower than himself.

There are a few people who can enter the big sect and become disciples in the room, and there are a few people who are ordinary people, and if the gap is not particularly large, there is not much reference significance for cultivating this kind of thing, unless it is a disciple of Song Xi who has a complete spiritual root.

"The master of the Mu Shao Sect is polite, in Xia Yuxiao, thank you to the three Taoist friends for saving me just now." Yu Xiao replied.

Mu Yunqian waved his hand indifferently, and smiled bitterly: "It's just a gesture, besides, Yu Daoyou is only temporarily safe, the group of blood fairy insects did not fly away completely, they are just waiting for the prey to appear."

As soon as we leave this barrier, they will immediately notice it, and they will surround it, and we will ...... It's all trapped here. ”

"I see!"

Yu Xiao thought it was strange before, why didn't these three people go to collect spiritual herbs, but instead sat leisurely.

Now he understands that it's not that the three of them don't want to leave, but that they are also targeted by the Blood Immortal Worm, and they can only rely on this method to temporarily save their lives.

Now they are also sympathetic.

"By the way, Yu Daoyou, are you here alone?" Mu Yunqian asked out loud.

"Yes, it's just me." Yu Xiao nodded, he also knew that the other party wanted to find more helpers to deal with those blood fairy insects, but this place was really special, and there were not many people who could enter this place.

If he hadn't followed the Blood Immortal Worm all the way here, he wouldn't have discovered the Stone Formation, let alone tried to enter it.

"Looks like we'll only be able to get out when the building is closed." Mu Yunqian shook his head and sat down indifferently, since he couldn't get out, he just waited.

Yu Xiao was not as depressed as the three of them, and his attention at the moment was attracted by the strange ancient tree behind him.

The tree is tall and straight, like a pillar, with a trunk thicker than a jar, with lush red leaves on the top, and a crown shaped like an outstretched arm.

"This tree...... It can't be the Yuan Danshu, right? Yu Xiao's pupils shrank slightly, and he instantly understood why those blood immortal insects had undergone such a big mutation.

The Yuan Dan Tree, as its name suggests, can give birth to a spiritual fluid called 'Blood Yuan Dan'.

Blood Yuan Dan is actually the gum of the Yuan Dan tree, it is conceived from the inside of the Yuan Dan tree, through a long period of penetration, on the surface of the bark to form a ball of spiritual liquid fruit similar to wolfberry, because its appearance looks like a pill, and the same as blood, so it is named Blood Yuan Dan.

Whether it is for spirit beasts or humans, the Blood Yuan Pill has great benefits, it can stimulate the potential of the human body, mortals eat to strengthen the body, it is not a problem to live to be more than a hundred years old, and the monk can use them to temper the body.

If the spirit beast eats the Blood Yuan Pill, it will produce different degrees of evolution and mutation, and it can even complete the transformation process that can only be achieved in decades or even hundreds of years in a short period of time.

Those blood fairy worms, presumably it was after eating the Blood Yuan Pill that such a big change would occur.

The more you eat this kind of thing, the more obvious the effect is, and the new Blood Fairy Worm King eats very little, and after leaving the stone formation, he encounters other Blood Immortal Worms and begins to cannibalize each other, transforming in the direction of the Worm King.

And those blood fairy insects before, because they ate too much, far exceeded the mutation range of normal blood fairy insects, and they couldn't kill each other, so they couldn't give birth to the insect king.

Therefore, they can only become bigger and stronger, and without the command of the insect king, they will become a group of crazy insects that hunt completely by instinct.

After understanding this, Yu Xiao suddenly had a bold idea, what would happen if he used the Blood Yuan Pill to create two mutant insect kings?