"Huh?"

Leon groaned in confusion and picked up the leftmost fragment.

"Click, click, click!"

Spiderweb-like cracks suddenly appeared on the surface of the fragment, and rusty copper coins fell to the ground one after another, making a crisp crashing sound.

Li Ang hurriedly bent down to pick it up, and collected more than a dozen badly corroded copper coins together, and combined them into a simple and simple silver badge.

"Huh?"

Li Ang was stunned, and held up the silver badge to look at it carefully.

The badge is composed of seventeen or eighteen copper coins, and the surface is pitted, uneven, and full of the vicissitudes of time.

"What's up with this badge?"

Leon frowned, vaguely feeling as if he had overlooked some important information.

"By the way, this is the ...... given to me by the owner of the antique shop"

Li Ang suddenly realized, and his eyes fell on the pile of rocks inside the counter.

The surface of this pile of rocks was engraved with runes, and it looked like a key node of some kind of formation, but it was destroyed for unknown reasons.

He put the silver badge back on the counter, then picked up another pile of rocks and began to ponder it.

"This pile of rocks should be the core of the formation, but it's a pity that it was destroyed by me."

Li Ang muttered, his brows furrowed: "It's a pity that such a precious antique is actually cheaper for me." ”

There was an item in the pile that intrigued him.

It was a black iron box, the outer shell was wrapped around a wire mesh, and the shape was simple and rough, without any fancy or decoration.

"The owner of the iron box should be the survivor who entered the tomb in the first place. Over the years, he must have often taken out the tin box to study, so that he could keep it intact. ”

Li Ang rubbed the thick rust on the iron box, and thought to himself, "But this rust has weathered and can't provide any effective clues." ”

"Forget it, let's go see the situation of those skeleton soldiers first."

Leon turned and walked towards the skeletons.

"Ahh

As soon as they got close to the group of skeletons, several skeletons screamed and pounced.

Leon raised his leg and kicked away several skeletons, walking up to one of them.

He pulled out his dagger and slowly cut through the wound in the skeleton's skull, eventually finding a thin metal chip with liquid flowing from it, as if it were some kind of grease.

"What is this?"

Leon frowned and flipped the tin box over, trying to find a chance in it.

Click!

Suddenly, a short gun popped up on the inner wall of the iron box, aiming at Li Ang and pulling the trigger.

"Whew!"

A dark green gas bomb whizzed out, piercing the air.

"Uhh

Li Ang covered his nose, looked at the gas bombs flying towards him in horror, and desperately hid to the side.

Burst!

The highly toxic gas penetrated the walls, leaving behind a cavern the size of a bowl, which was extremely corrosive.

Leon trembled, but his eyes bloomed with a feverish look and he laughed.

"Hahaha! Great, a chance to leave this catacomb! ”

Excited, he rushed to the wall, grabbed the tin box, and prepared to throw it out of the cave.

"Boom~"

At that moment, the entire hall shook violently.

Li Ang was caught off guard, stumbled and fell, and almost didn't fall on the skeleton's corpse.

At the same time, the iron box in his hand also came out of his hand, flew out of the cave, and disappeared into the sky of the dark abyss.

"Damn ......"

Leon cursed, and hurried out of the cave, standing on the edge of the cliff, looking down.

"Bang la la ~ bang la la ......"

Huge waves rose at the bottom of the cliff, and hundreds of Ahuizotls rushed out of the water like giant beasts, roaring in the sky.

An indescribable oppressive aura enveloped the entire valley, as if the end had come.

"it!"

Frightened, Leon turned around and fled back to the tomb, slamming the door shut.

The roars of the Ahuizotls gradually stopped, and they returned to their places.

The tomb was quiet, and only a strange blue demonic aura was rising and jumping, like a blooming lotus flower.

"What the hell is this......"

Li Ang swallowed his saliva, wiped the cold sweat on his forehead, sat on the chair and gasped for breath to rest, observing the changes in the demonic qi by the way.

"Buzz ......"

The demonic qi fluctuated slightly, and the rotation became more and more intense, gradually condensing into a fist-sized ball of light blue light.

"It's ...... Spiritual source? ”

Li Ang's eyes widened, and he was pleasantly surprised.

The spiritual source is a strange spar that contains aura, which is relatively rare.

Reiki was very important to ordinary human martial artists and transcendent beings, but it had no effect on Leon.

He is a half-dragon man with a special physique, and he doesn't need a spiritual source to improve his strength at all.

However, the Spirit Source can improve the qualifications of martial artists, so that highly qualified humans have strong combat power.

"If you can get a piece of spiritual source, and then combine it with other elixirs to refine it into an elixir or something else for relatives and friends to take...... Tsk, it will definitely greatly enhance their qualifications and potential. ”

Li Ang rubbed his chin and secretly calculated the pros and cons.

According to his estimates, although the effect of aura is far less than that of spirit jade, it is still precious to him.

If he can, he hopes to bring the spiritual source back to the present world, so that relatives and friends can absorb the spiritual source and obtain better qualifications, so that he can practice twice the result with half the effort in the future.

"But how can I get out of this ancient tomb?" Li Ang frowned and looked around.

"No...... right"

His eyes lit up, and he suddenly noticed a metal box lying in the corner.

"Could it be that there is something in this box that has stimulated these undead?"

Leon walked to the corner and opened the box, revealing a metal card inside.

The card is square, with dense symbols inlaid on the edge, and the front is a complex pattern, and on the back are three ancient seal fonts -

【Key】.

"I see, it's really the key......"

Leon nodded thoughtfully, put the card in his arms, and continued to explore the tomb.

Soon, he found two more metal boxes in the corner.

Leon took out all the remaining five spiritual sources and put them into two boxes.

"Buzz!"

The five spiritual sources touched each other, emitting strange vibrations, and then they merged into one, turning into a milky white gem the size of an egg.

"That's ...... so"

Leon grinned, placed the milky white gem in his palm, and looked at it carefully.

This was the first time he had seen a living spiritual source, and his heart was pounding.

It is rumored that Reiki is an element of heaven and earth, and no matter what kind of creature it is, it must rely on the Heaven and Earth Yuan Qi to cultivate, and the cultivation speed is far inferior to the Heaven and Earth Yuan Qi.

The birth conditions of the aura are harsh, not only requiring a large number of mineral vein resources, but more importantly, the aura is mixed with many mixed elements of heaven and earth.

For example, negativity, aging, sickness, and so on.

Therefore, after reaching the A-level stage, the vast majority of cultivators stagnated and were unable to break through the bottleneck and step into the S-level or even SSS-level realm.

In addition to this, aura is also the most difficult element to capture and use in the cultivation world.