247: Obtain secrets and upgrade the cave

"Yu Lei Secret Method?"

Mu Feng was stunned for a moment.

"It seems I don't really need this, do I?"

His lightning was all activated from Magic Treasures, so the Yu Lei Secret Method wouldn't be very useful.

"It's useful. Our clan's Yu Lei Secret Method can make your control over lightning even more proficient."

"Just like this!"

To impress Mu Feng with his thunder technique,

the Lei Yu Race birdman demonstrated it himself.

He flicked his hand, and two lightning snakes emerged from between his fingers, quickly slithering over his body.

"It seems just so-so."

Mu Feng shook his head. This kind of Yu Lei Secret Method was quite useless to him.

"The Yu Lei Secret Method also contains a Sacrificial Thunder Technique, which can increase the power of the lightning on your body by several times!"

Seeing that Mu Feng was not satisfied,

the other party explained another use of the Yu Lei Secret Method.

"Sacrificial Thunder Technique?"

"Power increased by several times?!"

Mu Feng's eyes lit up.

His Evil-warding Divine Lightning and Extreme Lightning Bottle were both quite powerful.

If the power could indeed be multiplied again as the other party said, then it would be quite practical.

"You've convinced me."

"But I need to inspect the goods first."

"Of course, you can refuse, but let me tell you in advance, I'm not as interested in this secret technique as you think. If you stall, I won't show any mercy."

Seeing the other party remain silent,

Mu Feng said indifferently.

"I can let you inspect the goods, but you must swear an Heart Demon oath that if you are satisfied after seeing it, you will let me go."

The Lei Yu Race birdman gritted his teeth and made the inspection request.

"As I said, I'm not as interested in this secret technique as you think."

"Your life and death are entirely in my hands now; you have no right to negotiate with me."

Mu Feng shook his head, refusing the other party's request.

The advantage was with him.

Only a fool would agree to the other party's terms.

"You win." The Lei Yu Race birdman gave a bitter smile.

He took out a Jade Slip, tapped it against his forehead, and copied the Yu Lei Secret Method from his mind.

"This is our clan's Yu Lei Secret Method. I hope you will keep your promise."

After copying, the Lei Yu Race birdman directly tossed it to Mu Feng.

Mu Feng did not rush to release his Divine Sense to investigate.

Instead, he first examined the information of the Jade Slip.

To prevent the other party from tampering with it.

A Jade Slip containing the Yu Lei Secret Method.

Mu Feng nodded.

This birdman was quite principled.

He hadn't tampered with it at all.

"What I gave is real."

Seeing Mu Feng holding the Jade Slip in silence,

the Lei Yu Race birdman was afraid Mu Feng would think he had tampered with it, and quickly explained.

"I'll judge whether it's real or not myself."

Mu Feng interrupted him, injecting his Divine Sense into it and beginning to investigate.

Yu Lei Secret Method: The Yu Lei Secret Method of the Lei Yu Tribe of the Flying Spirit Race.

System Reminder: Do you want to learn it?

"Not yet."

Mu Feng shook his head and put away the Jade Slip.

This was clearly not the place to learn secret techniques; he would wait until he returned to his Immortal Cave to slowly study it.

"Alright, you can go!"

After confirming that the secret technique was real, Mu Feng waved his hand, signaling the other party to leave.

"Thank you."

Seeing that Mu Feng actually kept his promise, the Lei Yu Race birdman was full of gratitude and even bowed to him before leaving.

No matter what, Mu Feng had indirectly saved his life.

He took a look.

Seeing that the other party had already left,

Mu Feng turned and walked towards the Sky Crystal Ant Nest.

"Whoosh whoosh whoosh!"

After releasing Azure Origin Sword Light to eliminate the Sky Crystal Ant Squad guarding the nest,

Mu Feng easily entered the Sky Crystal Ant Nest.

"So many Spirit Stones!"

As soon as he entered, Mu Feng saw Spirit Stones piled up like small mountains in the nest.

He immediately went over excitedly and collected all of them.

System Reminder: Low-Grade Spirit Stone x1

....

System Reminder: High-Grade Spirit Stone x1

There were many Spirit Stones.

Mu Feng sorted them out.

He found that there were a total of over eight thousand Low-Grade Spirit Stones inside.

Over forty Mid-Grade Spirit Stones.

And nine High-Grade Spirit Stones.

"Comfortable, comfortable!"

With the Spirit Stones in hand, Mu Feng's face broke into a happy smile.

With these Spirit Stones, he finally had all the Spirit Stones needed to upgrade to an Advanced Immortal Cave.

Now, he was only missing the last Wood Spirit Orb.

The other side of the nest also has a platinum treasure chest. Don't forget to take it.

After putting away the Spirit Stones,

the red prompt reappeared before Mu Feng's eyes.

There was also a platinum treasure chest!

Mu Feng's eyes lit up.

This was truly an unexpected surprise.

Following the indicated location,

soon, an emerald treasure chest appeared before his eyes.

It was precisely the platinum treasure chest he had seen many times before.

Speaking of which, it had been a long time since he had opened a treasure chest.

Whoosh whoosh!

Mu Feng casually released Azure Origin Sword Light to deal with the Heaven Crystal Ants guarding the treasure chest.

Then he quickly walked over and opened the platinum treasure chest.

System Reminder: Wood Spirit Orb x1

System Reminder: Shaman Treasure Azure Rainbow Sword x1

System Reminder: millennial ironwood x5

System Reminder: Black Silk x10

....

"Wood Spirit Orb!"

Mu Feng immediately spotted the Wood Spirit Orb among the many prompts, and eagerly took it out to examine it.

Wood Spirit Orb: A bead containing a large amount of wood-element energy, widely used, can be used to upgrade Advanced Immortal Caves.

"Nice! This is it!"

Mu Feng excitedly picked up the Wood Spirit Orb.

With it, he could finally upgrade his long-desired Immortal Cave to Advanced Rank.

Once the teleportation array was built, he could go play in the central area.

Mu Feng was still very much looking forward to the central area mentioned by the Changqing Clan.

After putting away the Wood Spirit Orb,

Mu Feng looked at the remaining three items.

Name: Shaman Treasure Azure Rainbow Sword

Rank: Shaman Treasure

Effect: After injecting spiritual power, it can release a large amount of Azure Rainbow Swords to attack enemies.

...

millennial ironwood: Wood blocks decomposed from millennial ironwood, extremely hard, are top-grade Materials for making Puppets and refining corpses.

....

Black Silk: A tough strip of cloth, an excellent Material for making clothing-type Magic Treasures.

....

Three items.

Among them, the small sword Talisman was a Shaman Treasure called Azure Rainbow Sword. Mu Feng looked at it a few times and lost interest.

After advancing to Core Formation, the power of Shaman Treasures was no longer sufficient.

However, selling it should fetch a good price.

Besides the Shaman Treasure, the remaining two items were millennial ironwood, which he was currently looking for.

With these ironwood, he could begin refining some Iron Armor Corpses to play with.

Even if he didn't use them then, he could trade them for things he needed.

Refined corpses comparable to the Foundation Establishment Late Stage, he believed, would definitely be very sought after.

After putting away the millennial ironwood,

Mu Feng picked up the Material called Black Silk.

"Material for refining clothing-type Magic Treasures."

"Not bad."

Mu Feng nodded and put it away.

System Reminder: platinum treasure chest x1

System Reminder: Do you want to disassemble the platinum treasure chest?

"Not yet."

Mu Feng shook his head.

The platinum treasure chest could be used to store things.

Moreover, after returning, he would have to disassemble the emerald treasure chest to gather the emerald needed for the Immortal Cave upgrade.

This meant he would have to find something new to store the items currently in the emerald treasure chest.

Therefore, this platinum treasure chest could not be disassembled.

Otherwise, the space in his Storage Ring would be reduced by many slots again.

He checked it once.

After finding no other items in the Sky Crystal Ant Nest,

Mu Feng picked up the platinum chest and used a return-to-city Talisman to return to the city on the spot.

After a flash of golden light,

Mu Feng appeared inside his Immortal Cave.

He placed the platinum treasure chest he was holding.

Then he poured out all the items that were in the emerald treasure chest.

He began to disassemble it.

System Reminder: Do you want to disassemble the emerald treasure chest?

"Disassemble!"

Mu Feng nodded.

System Reminder: emerald treasure chest successfully disassembled.

System Reminder: Emerald x5

The treasure chest was successfully disassembled, and five dark green emeralds appeared in Mu Feng's hand.

"What beautiful emeralds, these must be ice-grade imperial green, right?"

Mu Feng didn't have much knowledge about emeralds; he only knew a few names.

However, the emeralds in front of him were indeed beautiful, a deep green, and would certainly be worth a lot of money in modern times.

But in the Cave World, practicality was what mattered.

After playing with them for a few moments, Mu Feng put them into his Storage Ring.

After disassembling the two treasure chests, he had finally gathered all the Immortal Cave upgrade Materials.

"Finally gathered!"

Mu Feng rubbed his hands excitedly.

He was already impatient to upgrade his Immortal Cave and explore the new map.

Opening the panel, Mu Feng clicked on the [Immortal Cave] page.

Ready to begin upgrading to a new Immortal Cave.

Current Immortal Cave: Intermediate Immortal Cave

Effect: Immortal Cave Spiritual Qi density increased by 200%, Spiritual Fields opened for planting Spiritual Plants and Spiritual Trees, Spirit Gathering Array added, Insect Room and Defensive Formation opened.

Next Level: Advanced Immortal Cave

Upgrade Requirements: void spirit stone 5/5, dream stones 3/3, Any Millennial Spirit Wood 10/5, Wood Spirit Orb 1/1, Fire Spirit Orb 1/1, Metal Spirit Orb 1/1, Water Spirit Orb 1/1, Earth Spirit Orb 1/1, Emerald 10/10, High-Grade Spirit Stone 20/20, Mid-Grade Spirit Stone 344/300, Low-Grade Spirit Stone 54000/50000

Upgrade Effect: Immortal Cave Spiritual Qi density increased fivefold, new Immortal Cave space opened, Teleportation Formation added, Immortal Cave scale expanded, Immortal Cave can be named.

.....

System Reminder: You have gathered the Materials for the Immortal Cave upgrade scroll. Do you want to upgrade the Immortal Cave?

"Upgrade!"

Mu Feng nodded.

He naturally wouldn't miss this long-awaited upgrade opportunity.

System Reminder: Materials have been deducted. The Immortal Cave is currently upgrading...

As the red prompt appeared,

the entire Immortal Cave where Mu Feng was located began to vibrate violently.

This vibration was many times more intense than the previous two.

Large and small pieces of dirt and stone fell from the ceiling.

The surrounding Immortal Cave walls were also completely shattered.

The floor rose, and cracks appeared in the ceiling.

"Holy cow, why is it so intense this time?"

"Could it be a fake upgrade scroll?"

"Why does it feel like my Immortal Cave is going to be completely demolished!"

It wasn't surprising he thought this; although there had been vibrations in previous times, they were all small-scale.

This time, the commotion was a bit frightening.

The little fox playing nearby was so scared it trembled, jumping onto Mu Feng's body, looking as if facing a formidable enemy.

Rumble.

The Immortal Cave's vibration continued.

Under this violent vibration, the walls at the top had completely come apart.

Dazzling sunlight shone in.

This was the first time he had seen such dazzling sunlight inside his own Immortal Cave.

Previously, he could only see a faint glimmer of light coming from the top.

Besides the changes at the top, the walls and the bottom were also continuously rising.

"Is this going to add another floor?!"

Looking at the gradually widening view,

Mu Feng's eyes lit up.

If it was truly like this, then it would be a revolutionary upgrade.

This upgrade took a bit longer than the last one.

It lasted for about half an hour.

Only then did the entire Immortal Cave's vibration cease.

This made Mu Feng even more excited about his new Immortal Cave.

System Reminder: Immortal Cave upgrade complete. Current Immortal Cave Rank is Advanced Immortal Cave!

A dazzling white light flashed.

When Mu Feng opened his eyes again,

the entire interior of the Immortal Cave had been completely transformed.

Smooth, deep green walls made of emerald, and wooden floors crafted from Millennial Spirit Wood.

It looked incredibly magnificent. Putting everything else aside, visually it exuded a high-class Aura, perfectly fitting his title as the First Core Formation in this Cave World.

"Ying ying ying!"

Mu Feng's satisfaction was unknown, but the little fox was extremely pleased, leaping up and down on the wooden floor.

After the upgrade, the bedroom and the hall were no longer connected but had become multiple rooms.

The place he was currently in seemed to be a cultivation room.

"Let's go out and see."

Mu Feng took the little fox and walked out of the room.

Outside was the main hall.

The hall had also changed significantly. Besides the previous eight teleportation gates, there was also an additional teleportation array.

Needless to say, it must be for traveling to the new map.

The Five Elements Formation outside the hall, after being upgraded with the Five Elements Spirit Orbs, had become even larger and sturdier.

Five orbs floated within it.

"This means an additional offensive Formation!"

Looking at the constantly moving orbs, Mu Feng's eyes lit up.

The previous Formation only had defensive and trapping effects.

And the effect was not very obvious.

Although Mu Feng hadn't entered to inspect the upgraded Formation yet, from its Aura, it was already on par with the Inverted Five Elements Array he had obtained before.

"First, let's see what kind of Formation it is!"

Mu Feng activated his Spiritual Eye Divine Power and began to curiously investigate.

Five Elements Dividing Light Array: A common Immortal Cave Formation, integrating attack and defense. As long as the energy within the Formation is inexhaustible, it can continuously release the power of the Five Elements to defend and kill enemies. Anyone below Nascent Soul who enters will surely die!

"Five Elements Dividing Light Array, below Nascent Soul, those who enter will surely die!"

"Holy cow, that's amazing!"

Mu Feng's eyes sparkled.

Indeed, expensive things have no flaws except being expensive.

Mu Feng hadn't felt much about the previous Immortal Cave changes.

It wasn't until he saw this Immortal Cave Formation that Mu Feng felt it was worth the price.

Just based on this Formation that could kill those below Nascent Soul, the ten thousand Spirit Stones spent were not wasted!

System Reminder: The Five Elements Dividing Light Array has not yet been refined. Please refine and recognize it as your master as soon as possible to avoid accidentally harming yourself.

Refinement Method: Inject a wisp of Divine Soul.

"Inject Divine Soul."

Mu Feng nodded. He was not unfamiliar with this refinement method.

After separating a wisp of his Divine Soul and injecting it into the Formation,

the entire Formation lit up.

And Mu Feng gained several spell techniques to control and master the Formation.

He could freely change the Formation, whether it was for defense or offense.

"Good, good!"

He manipulated it a few times in succession.

After adapting to the changes of the new Formation, Mu Feng stopped.

(Happy New Year, everyone! Wishing all dear readers good luck in the Year of the Dragon, and great wealth, hehe.)