The blue light spread, and soon spread into the canopy of the Great Dryad, and together with its own strength, it quickly extinguished the black flames around it, successfully saving its own life.

However, after a few tosses, its injuries were not light, and it took more than half an hour for it to recover its strength, and some blackened branches and leaves bloomed again, and the blue light flickered.

"This guy's vitality is ridiculously strong!" Han Feng watched coldly, muttering secretly in his heart.

After dozens of breaths, as a large amount of spiritual energy flowed into the body of the big tree demon, one after another new branches and leaves grew, making it shine brightly, and half of its injuries recovered.

"The fire is extinguished, and you are rejuvenated, isn't it time to get down to business?!" During this period, Han Feng also took medicine to breathe and recover his energy, and said coldly at this moment.

"Understood, understood. The Great Dryad replied busily.

After saying this, its main trunk glowed, and then the entire crown of the tree was also emitting a brilliant turquoise light, slowly condensing, gradually condensing, and in a moment it changed into a rune, on which the lines were complex, as if outlined by thousands of green threads, like jasper, brilliant as fire.

"Hoo ......"

The sigil flew upwards at a very slow speed, and it was only a few distances away with a single breath, as if it were heavy on its own.

Han Feng staggered his body and let this ten-zhang-sized sigil rush to the top of the cave, and with a bang, it was heavily imprinted.

Immediately after, this sigil spread out and turned into thousands of silk threads attached to the stone wall, like a spider web, enveloping the uneven stone face.

"Buzz ......"

A sound of mechanical opening spread, and the stone surface on the top of the cave began to glow gray, and a striped road was revealed, gradually coinciding with the runic silk line sacrificed by the big tree demon, and the original uneven stone surface, the stone rose and fell, and after a while, the entire stone surface became extremely flat and smooth as a mirror.

Han Feng was stunned for a moment, he was a little surprised, he didn't expect that there would be such an arrangement, this underground palace is very likely to be a stone talisman, and every place is engraved with a talisman.

Just when he was secretly thinking about it, the stone surface above changed again, a burst of light flowed, in the center, about nine feet square, suddenly cracked a hole, quickly opened, and in a blink of an eye it became a hole, empty inside, nothing else, and a cool breeze blew out of it.

"My lord, the entrance to the cave has been opened, please enter it as soon as possible, I won't be able to last long!" said the Great Dryad hurriedly.

"Are you the guard here?" Han Feng asked without answering.

"I don't know, it's an innate skill that I've lived for so long, and it's the first time I've opened this hole. The big dryad gasped, "Please go in early, every breath makes me extremely uncomfortable, I, I almost can't hold it anymore!"

Han Feng's soul power spread out, infiltrated into the entrance of the cave, and after careful inspection, he really didn't find anything abnormal, and the passage in the cave suddenly became larger dozens of feet away, as if it had penetrated another horizontal corridor.

Without hesitation, he immediately rushed in, and in a few flashes, he went to the horizontal corridor.

Just then, the hole below began to heal and disappeared in an instant.

Han Feng turned around and stroked the stone wall, and found that it was tightly sealed, without the slightest trace of healing, and the secret path was magical.

Then, he looked back at the corridor, and found that it was shining in all directions, and there were also dense crystals on the four walls, which made him feel uneasy, for fear that they would suddenly explode again, forming a terrifying flame of light.

He didn't dare to stay, and immediately walked to the right, just because at the last moment, the big tree demon transmitted a message to him through the air, saying that he would walk all the way to the right, and if there was no accident, he would be able to get out of this underground palace.

As for the reason, it only said that it was a memory hidden deep in its soul, and it did not know if it was correct or not.

Han Feng naturally didn't know if it was true or not, but presumably the other party didn't dare to deceive him, otherwise he would go back to that cave cellar, and he would not be able to die.

Moreover, in Han Feng's opinion, the biggest role of this underground palace is to seal the princess of the ghost clan, and there is no other purpose, and there will be no secret treasures.

Even the reason why he was able to go to the cave and the lake smoothly should be thanks to Yan Yanfang's guidance, especially that time when she broke out of the formation in the passage, she definitely crossed a lot of roads and went directly to her destination.

At the same time, he secretly guessed that the plants on that island were most likely the handiwork of the princess of the ghost clan, and as for why the soul revival grass was cultivated and what the purpose was, I am afraid that only Yan Yanfang and the princess of the ghost clan knew.

In less than half an hour, Han Feng walked out of this horizontal corridor and went to another passage without any danger.

This passage was larger, three zhang wide, and the surrounding crystals were shining, and the four walls were still inlaid with spars, which dazzled Han Feng.

He didn't think much about it, as soon as he came here, he immediately turned right, and after a while, he was about to turn a corner, and then it was winding up, twisting and turning.

Time flew by, Han Feng turned all the way to the right, I don't know how many passages he passed, and finally came to the passage where he first came in after most of the day.

He found that the spar in this passage had disappeared, presumably because it had been consumed after it exploded, making it dark and dark at the moment, and he couldn't see his fingers.

What's even more terrifying is that even his soul power can only cover a range of five or six zhang.

"The previous spar eruption, it seems that Yan Yanfang also did it, the purpose is to let me enter that cave cellar, fortunately her tricks were detected in advance, otherwise in her heyday, if she really absorbed half of the energy of the Soul Restoration Grass, she would be in danger!" Han Feng was secretly happy as he ran quickly.

This passage was very long, and it took Han Feng half a quarter of an hour to reach the end and smoothly enter the entrance passage.

The entrance passage climbed up in a spiral, and Han Feng kept circling around it, and it took him a while to finish it, and he successfully reached the entrance of the cave to the west.

The hole was still open, and there was even a ray of sunlight slanting in, making it a little warm.

Han Feng stepped out and finally returned to the outside world.

"Haha, you kid finally came out, hand over everything you got, our brothers can consider sparing you from dying!"

Suddenly, a hearty voice came from mid-air, and the tone was arrogant and arrogant.

Han Feng was deeply surprised, looked up and followed the sound, only to see Wu Nan suspended in mid-air, his eyes like eagles, staring at Han Feng gloomily.

Not far from both sides of Wu Nan floated two monks whose aura was not weaker than his, one wearing a light cyan Taoist robe embroidered with gold thread, and the other wearing a fiery red brocade coat.