"Thunderclap Wood? What's the Thunderclap Wood?" Duanmu was the first to ask.

"The Thunderclap Wood is one of the three ancient divine trees. It can absorb the thunder between heaven and earth and become the power of thunder and lightning. Look at the silver flower on it. It's not an illusion. It's a real bolt of lightning," said Xiao Yi as he suppressed the excitement in his heart.

"There's such a divine wood? I've never heard of it!" Duanmu was eager to give it a try. He shook the scythe, and with a flash of energy, he struck the Thunderclap Wood.

"Bang!" With a loud noise, the black scythe struck the Thunderclap Wood. The lightning spiraling around the tree immediately resembled a silver dragon. It wrapped around Duanmu's scythe. The numbing sensation immediately spread over Duanmu's body.

"Ah!" Duanmu cried out in pain. With a sudden swing, he was about to throw the big scythe out.

However, just because of that shaking, his arm became numb instantly. It was difficult for him even to throw the scythe away.

At this critical moment, a beam of sword light suddenly flashed by, and a black sword was placed on Duanmu's scythe.

It was Xiao Yi who released the Doomsday Sword. With a trick, he knocked away the scythe in Duanmu's hand.

With a "puchi" sound, the scythe fell into one side of the stone wall. Streaks of silver dragon-like lightning clashed with the scythe on the stone wall, making a deafening sound.

"F*ck, this Thunderclap Wood is tough to deal with!" Duanmu shouted angrily.

"As I said before, it has accumulated the thunder power for nearly ten thousand years on it. How dare you touch it with metal? You are lucky I was not far away from you. Otherwise, you'd be burned into charcoal if I delayed for another second. You've been flighty recently, and it's really time to control your temper." Xiao Yi said unceremoniously.

Duanmu shrunk his neck. Indeed, he had been flighty recently and became more and more impatient. The more he wanted to show off his extraordinariness in front of Xiao Yi, the more he ended up in a self-defeating situation.

Xiao Yi didn't say anything more. But he was also shocked by the scene just now.

This was just the original Thunderclap Wood that had not been refined yet, but it was so powerful. If he refined it into a Flying Sword, the power it burst out could be imagined.

Back then, his Haotian Stone Flying Sword was just a trick. With the power of Fire Essence and the Thunder Array, it had collected a lot of Lightning Spells. However, even so, at the crucial moment, when the Lightning Spell was triggered, it could still shake the world.

Unfortunately, the Haotian Sword was destroyed during the battle with Richard.

The self-destruction of the Haotian Sword had made Xiao Yi's heartache. It was undoubtedly the most tragic battle since Xiao Yi's rebirth. He had suffered great losses. He had thought that if he was lucky enough to get the Fire Essence again, he could make another Haotian Sword with the Lightning Spell.

Who would've thought that he wouldn't be able to obtain the Fire Essence, but he would've seen the Thunderclap Wood, one of the three ancient divine trees?

If the Flying Sword were made of the Thunderclap Wood, it would possess the genuine power of thunder. It would be many times more powerful than the ingenious Haotian Sword.

Thinking of this, Xiao Yi had an impulse to worship it. It was a lucky chance to let him enter the underground palace under the large swamp and get endless benefits.

Initially, during the trip, he just wanted to obtain the Three-legged Golden Toad. It could be said that he had succeeded if he could get it, and he dared not to be greedy.

But he didn't expect that he would encounter many adventures by chance, which made Xiao Yi couldn't help but appreciate Heaven's favor.

The Thunderclap Wood was implanted here when the ancient cultivators built the underground palace. After nearly ten thousand years, it was only two meters tall. It could be seen that this thing was precious.

After thinking for a while, Xiao Yi activated his Doomsday Sword. He activated his True Energy, and a strong Samei True Flame was caught in the sword's radiance and cut to the ground near the roots of the Thunderclap Wood.

"Clang!" A dull sound immediately rang out, as if it had hit an iron plate. It was evident that there was a restriction on the ground.

"Jiuer, I'll have to trouble you for a while!" Xiao Yi looked at Jiuer with some embarrassment and said.

Although he could think of a way to comprehend the restriction on the ground and break the formation, it was not as convenient as Jiuer's Devil God Sword. That was why Xiao Yi said so.

"Okay." How could Jiuer not understand Xiao Yi's intentions? She nodded her head and immediately released the Devil God Sword. A touch of sword radiance mixed with a sticky blood light cut to the ground where the Thunderclap Wood root was.

"Swish, swish, swish!" After a slight noise, the restriction on the ground had disappeared. Not only that but the ground was scorched black by the blood light. The roots of the Thunderwood Tree were exposed, and they were also wrapped with fine lightning, sizzling.

"Oh my God!" Duanmu looked at this scene, the Devil God Sword, and then Jiuer. He was shocked and envious, but he had no words to express his feelings.

Xiao Yi also couldn't hide the shock in his heart. When Jiuer put away the Devil God Sword, Xiao Yi released the Doomsday Sword. He carefully peeled off the soil from the roots of the Thunderclap Wood. Bit by bit, he exposed all of its roots.

Subsequently, he carefully rolled it up with his True Energy and absorbed the entire stalk of Thunderclap Wood into his Square Gourd.

The Soul Devouring Beast was sleeping inside the gourd, and it was startled when it heard the sound.

The next moment, its eyes lit up. It saw this stalk of lightning wood, and with a few movements, it ran over, reaching out its pitch-black claws, carefully about to touch it.

Suddenly, Xiao Yi's voice rang out in his mind, "No! You're from hell! You'll suffer if you touch this tree's lightning!"

When the Soul Devouring Beast heard these words, it hurriedly retracted its pitch-black claws and hid in the corner. However, it was still shocked by the fiery tree's silver flowers, and its tiny eyes continuously rolled around to size it up. However, it didn't dare to act recklessly.

Xiao Yi obtained the Thunderclap Wood easily. He was very excited, but he also knew that he could not get too many benefits for no reason, and that he should not be complacent. In the future, he must accumulate a lot of merits and be virtuous to carry things. Otherwise, if his virtue were not supported by anything, he would be affected by disasters.

After putting away the piece of Thunderclap Wood, Xiao Yi also thought of the Mysterious Yin Water in the north room.

Although the Mysterious Yin Water had been stored here for nearly a thousand years, it never gave birth to objects similar to Sword Spirit and Fire Spirit. Presumably, it was related to the Dark Yin Earth Dragon. It broke the restriction and kept absorbing the extreme Yin Qi of the Mysterious Yin Water. Hence, the pond water was hard to give birth to demons in the water. After nearly a thousand years, it was still a pool of Mysterious Yin Water.

Even so, Xiao Yi still had to go and collect some. It was rumored that the Mysterious Yin Water was refined from the Yellow Springs. Each drop was more than 500 kilograms in weight. Moreover, it contained a significant amount of Yin Qi. It was also a rare top-grade spiritual material.

Thinking of this, Xiao Yi was going to ask Duanmu to take them to the north room to collect the Yin Water.

However, he saw that Jiuer was walking to a corner of the room and bending over to look at something.

A thought came to Xiao Yi's mind. He knew that Jiuer was pure in mind and had an amazing sense of tension, but he didn't know what could make her pay attention to.

Xiao Yi walked over to her and asked softly, "What's wrong, Jiuer?"

"There's a bunch of grass in the corner of the wall. It's really strange." Jiuer straightened up and pointed to the corner of the wall.

Xiao Yi stared at it, only to see a clump of purple-black grass. There was no strange aura, and its color was very close to the tiles inside the mausoleum. If one was not careful, one might not be able to see it.

There were a dozen of them, each thin and with oval leaves.

However, when Xiao Yi caught a clear glimpse of the leaf, he cried out in alarm, "Carefree Ghost Grass!"

That was because every part of this grass was like a smiling face. However, when he looked at them carefully, he found that the smiling face was a little gloomy, as if it were smiling with a ghost face.

It was also because of this unique characteristic that Xiao Yi immediately recognized this shrubbery of grass. It was one of the main ingredients for refining the Calamity-surviving Pill: Carefree Ghost Grass!

After Xiao Yi's ecstasy, he also understood that it was not surprising that he found the Carefree Ghost Grass in the east room.

It was very special and had to have two conditions for it to grow. One was the pure Wood Spirit Power, and the other was the continuous large amount of Earth Yin Qi.

As such, it was able to form a face-shaped leaf that looked both like it was crying and laughing. It was also because of this that this unremarkable, long, and fine grass contained both Yin and Yang Qi, and became a rare elixir.

And in this room, Thunderclap Wood was emitting pure Wood Spirit Power. The deep underground palace had an endless source of Yin Spiritual Energy, which satisfied its living conditions. Naturally, there was such a rare cluster of Carefree Ghost Grass.

The appearance of the Carefree Ghost Grass made Xiao Yi's surprise reach its peak.

Out of luck, the main ingredient for the Calamity-surviving Pill had become one more thing he encountered by chance.

Xiao Yi was extremely excited. He carefully picked the Carefree Ghost Grass and thank Jiuer. "Jiuer, thank you. Otherwise, wouldn't I have missed this Carefree Ghost Grass under my nose?"

Upon hearing this, Jiuer smiled, but she did not say anything. She held Xiao Yi's big hand and said softly, "Let's go!"

"Let's go!" Feeling proud, Xiao Yi called Duanmu.

Duanmu shook his hand and withdrew the scythe.

As soon as he took the scythe in his hand, Duanmu seemed to sense something different than usual. However, he did not have time to pay attention to it. He reached out and took Xiao Yi and Jiuer to the north room.

The Mysterious Yin Water gave off a strong Spiritual Power of water.

Ordinary vessels couldn't carry a single drop of this Yin Water weighing more than 500 kilograms. After thinking about it, Xiao Yi took out the Fire Dragon Cauldron. With a thought, the Kan Formation in the cauldron began to operate, and the cauldron's mouth was aimed at the Mysterious Yin Water.

As soon as he controlled his True Energy, drops of Mysterious Yin Water were slowly moved by Xiao Yi and became a thin line, turning into a water dragon and rushing into the Fire Dragon Cauldron.

It was a little bit difficult for Xiao Yi, a late Nascent Soul Realm Realm cultivator, to complete this process. It took him half an hour to collect all the Mysterious Yin Water drops into the Fire Dragon Cauldron Formation.

The bottom of the pond was empty, leaving only a huge hole. It was clear that they had been brought into this place by the Dark Yin Earth Dragon from the hole, and from there, they had obtained endless benefits.

Looking at the big hole, Xiao Yi turned to ask Duanmu, "Duanmu, have you found the shortcut to get out of the underground palace? Or do we still need to return to the vast swamp?"