It didn't take long for another pinprick-like energy to penetrate into Xu Feng's body, but this time it gave Xu Feng an extremely cool energy.

Xu Feng's heart moved, did he want to absorb the energy in this piece of ore like absorbing insect crystals?

As soon as he thought of this, Xu Feng couldn't bear it anymore and ordered the monitor lizard beast to protect himself, Xu Feng sat down cross-legged, holding the Five Elements Concentrate in both hands, just like absorbing the insect crystal for the first time, and began to absorb the energy in the concentrate.

Hot, cool, sharp, vibrant, thick and deep, five different senses of energy poured into Xu Feng's dantian in turn.

The five-element concentrate in his hand, the colorful light gradually disappeared, and the originally crystal clear ore disappeared with the light, turning into a stubborn stone, falling stone chips and powder.

The five elements of gold, wood, water, fire, and earth, the five energies converged into a round ball the size of a fingernail in Xu Feng's body, floating quietly in Xu Feng's dantian.

I don't know how long it took, Xu Feng was shocked, opened his eyes, looked down at the stone in the palm of his hand that had lost all its brilliance, Xu Feng gently grasped it, and the five elements concentrate that had lost energy suddenly turned into powder, and it spilled from Xu Feng's fingers.

"It turns out that this is the Natal Flying Sword." Xu Feng had a look of surprise on his face.

Pointing at the stone wall in front of him, a white light flew out of the tip of his finger and swooped into the rock wall, leaving a fist-sized pit with no bottom.

As soon as his mind moved, a white light came out of the deep sky and returned to Xu Feng's fingertips and drilled into Xu Feng's body.

"Like an arm and a finger, this natal flying sword is almost another organ of my body." Xu Feng said to himself: "No, it can't be called a flying sword now, it can only be called a sword embryo, and it still needs to absorb a large amount of five elements essence to forge a real natal flying sword, and now in the state of the sword embryo, it is still very easy to be damaged, once the natal flying sword is damaged, I will also receive serious injuries."

Although it has not really become a natal flying sword, it is only a sword embryo, but its power cannot be underestimated, and the power of the sword embryo is even more powerful than the silver-quality long sword in Xu Feng's hand.

"The Five Elements Essence is hard to find elsewhere, but this is a mine cave, what kind of ore is not, I can forge the Natal Flying Sword here." Xu Feng laughed.

Taking out all the ores in the storage ring, Xu Feng began to clench them in the palm of his hand one by one, absorbing the five elements essence in the ore.

"Cryolite, a good thing, can increase the essence of the water attribute." Xu Feng picked out a piece of ore that looked like an ice cube and held it in his palm.

The sphere in the dantian jumped slightly, and a cold energy flowed out of the ice crystal ore, flowing along the meridians in Xu Feng's body into the colorful sphere in the dantian.

Soon, the valuable ice crystal in his hand was mineralized into residue, and stone chips fell in a cloud and scattered.

Cryolite is an excellent material for refining weapons, and it has a high chance of adding effects such as freezing and slowing down to weapons, which is very sought after and valuable, but in less than ten minutes, this extremely valuable cryolite ore turned into a cloud of stone chips.

Looking at the small pile of stone chips in his hand, Xu Feng's eyes also showed a look of pain.

But thinking of the natal flying sword, Xu Feng gritted his teeth, and continued to pick out a piece of pale yellow ore and held it in the palm of his hand.

Soon, Xu Feng's stored ore was depleted.

"I originally planned to give Zheng Yi and let him improve his forging proficiency, but as a result, he used it all up." Xu Feng smiled bitterly.

Slightly sensed the sword embryo in the dantian, the original ball-like sword embryo has now become a water drop shape, but it is still a sword embryo, and there is still a long way to go before it becomes a flying sword.

"Damn, how much ore does this have to absorb before it can be forged into a real flying sword." Xu Feng couldn't help but shudder at the thought of Western medicine absorbing a huge amount of ore.

In less than an hour, the ore consumed by Xu Feng was worth tens of thousands of fate points, and if these ores were forged into weapons, the value would be doubled.

Just when Xu Feng was distressed, the monitor lizard beast suddenly stood up, squatting slightly on its hind legs, and making a threatening sound from its mouth.

Two three-star rock swallowing beasts suddenly appeared in front of them.

These two three-star rock-swallowing beasts were just ordinary monsters, and when they walked towards Xu Feng, the first thing they saw was not Xu Feng, but the corpse of the three-star elite rock-swallowing beast beside Xu Feng.

Seeing the corpse, the two Rock Swallowing Beasts were slightly stunned, as if they couldn't believe their eyes, they blinked vigorously, and when they confirmed that it was indeed the corpse of the three-star elite Rock Swallowing Beast, they suddenly became manic, their eyes were scarlet, their faces showed an angry look, and their four thick thighs kept trampling on the ground, making a rumbling sound.

"Die, die, die......"

An angry roar appeared in Xu Feng's mind.

The Rock Swallowing Beast rushed towards Xu Feng, and the monitor lizard beast next to it roared, jumped forward, knocked down a Rock Swallowing Beast, and then twisted its body, and the tail behind it slammed into the body of the other Rock Swallowing Beast.

As a three-star elite monster, it doesn't take much effort for the monitor lizard beast to deal with two three-star ordinary monsters.

"Let one go." Xu Feng hurriedly ordered.

"Just test the power of the sword embryo."

Xu Feng pinched his sword with two fingers, and swiped lightly towards the three-star monster that was rushing in, a white light came out of his fingertips, and with a bang, he slashed towards the Rock Devouring Beast, and the afterimage formed a white light and shadow more than ten meters long, like a narrow long sword.

The white shadow silently sliced over the Rock Eater's left shoulder, emerging from the base of its right leg and burrowing into the ground.

Puff~

A strange sound erupted from within the Rock Eater's body.

Swish~

Blood splattered, and the body of the Rock Swallowing Beast was split in half, sliding left and right, and slamming to the ground;

Xu Feng was startled, and the blow was fatal.

"Well, it's just an ordinary attack! actually killed a three-star monster in seconds. Xu Feng couldn't believe his eyes, the power of the sword embryo was even more powerful than he imagined, this surprise exceeded Xu Feng's expectations, and the power made Xu Feng himself a little scared.

"Monitor lizard, come back." Xu Feng commanded.

The monitor lizard beast, which had already forced the Rock Swallowing Beast into the corner, let out a dissatisfied roar, put down its front paws that were holding down the head of the Rock Swallowing Beast, and slowly walked to Xu Feng's side.

"Slash!"

Xu Feng snorted softly, the white shadow flashed away, and the Rock Devouring Beast that had just gotten up was split in half from head to toe.

"That's amazing!" Xu Feng was full of smiles.

The monitor lizard beast beside him seemed to be taken aback, and after taking a look at the corpse of the rock swallowing beast, the monitor lizard beast turned its head to look at Xu Feng, its eyes full of fear.

After harvesting the spoils of the two Rock Devouring Beasts, Xu Feng walked towards the depths of the mine with satisfaction, now the requirements for the absorption of the sword embryo are getting higher and higher, ordinary quality ores can no longer meet its requirements, and the five elements essence provided by high-quality rare ores can only meet its requirements, and such ores must be collected deep into the mine.