High-level martial arts: Contract cashback, invincible starting from the Zerg.

After killing two Earth-rank female Darkborns.

With the combined attack of Wu Yingguang and Xuri Dongcuo, the old Darkborn of the Earth Rank directly turned from having a strategic advantage to a disadvantage.

When Chen Feng joined the battle in his golden demon-slaying armor...

The old Darkin, gritting his teeth and holding on, suddenly found himself fighting three opponents at once, and quickly fell.

"This old guy's identity is not simple."

Wu Yingguang examined the badge on the old Darkborn's corpse and explained.

"The Darkin use thorns as their symbol. Each thorn represents a rank. Three thorns within our base are practically equivalent to a regimental officer."

"This old man is so amazing, I didn't realize it," Xu Ri Dong Cuo joked.

Wu Yingguang frowned and used magic to project the outline of the Darkin core on the old Darkin directly in front of the three of them.

The Darkin Core doesn't look very big.

The core was entirely black, with six fine black swirls slowly rotating deep within, emanating a bone-corroding aura that made Chen Feng's heart tremble.

But even just the core phantom made Chen Feng feel uneasy.

"Although this guy is only at the peak of the Earth Rank, his Dark Inheritance Core already has the Shadow Vortex, which means he is already capable of advancing to the Heaven Rank. He is currently suppressing himself at the peak of the Earth Rank, probably just because he wants to further purify his core energy."

Just then, Wu Yingguang turned to look at Chen Feng.

"Ordinary Earth-rank Darkborns might never even touch the threshold of the Shadow Vortex in their entire lives. But this old fellow not only condensed it, but he also had two full vortexes, which would have allowed him to directly advance to the Heaven-rank expert just now..."

"That ruthless?"

Xu Ri Dong Cuo laughed heartily.

"So, the three of us just killed a ruthless character who could ascend to heaven at any moment? No wonder he could withstand two heavy blows from me; he was hiding a trump card!"

"He failed to unleash the full power of Shadow Vortex."

Wu Yingguang's tone carried a hint of lingering fear. The pale golden magic condensed at his fingertips suddenly tightened, like the sharpest probe, precisely dissecting the structure of the Darkin core.

Just then, the phantom of the Darkin core trembled violently, and under the touch of the spell, it emitted a strange, blood-red glow that was completely out of place with the power of shadow.

The surrounding air instantly became thick and stagnant, and a malice carrying a violent sense of burning everything seeped out from that luster.

Even the slightest lingering force sent a chill down Chen Feng's spine.

"wrong."

Wu Yingguang's pupils suddenly contracted, his face turned deathly pale, and even his voice trembled slightly.

He suddenly increased his spell output, and the pale golden light instantly dissected the Darkin core phantom. The layer of crimson energy was also forcibly stripped from the source of the shadow by Wu Yingguang's spell.

A dense, blood-red talisman net was woven in front of the three of them.

Wu Yingguang frowned and revealed his new discovery: "His Shadow Core was sealed off at its energy source! From beginning to end, he couldn't even unleash half of his power!"

"What?!"

The smile on Xu Ri Dong Cuo's face vanished instantly.

A slight smile appeared on Chen Feng's lips.

"Is this the power of a demon?" Chen Feng asked knowingly.

"You're right, this is the Law of the Demon. It requires a demon to reach at least the Desolate Rank to use it. Once used, even a giant beast of the same rank will have its energy source sealed."

The Darkin and the Abyss Demons are two races with similar bloodlines; one worships the Shadow God, while the other worships the Blood Lord.

As their ranks rise, the gap in combat power between the Demon Lord and the high-ranking Darkin widens.

This gap, however, will be balanced again at ranks above the Heavenly Rank.

"Desolate...Desolate Rank?" Xu Ri Dong Cuo looked at Chen Feng in disbelief.

"At least... Desolate Rank."

Chen Feng ignored Xu Ri Dong Cuo's gaze, simply walking over to Wu Ying Guang and asking, "Captain Wu, can you sell me this Darkborn's core?"

"While the Darkin Core is useless against ordinary combatants, what do you need it for?"

Hearing Wu Yingguang's question.

Chen Feng took off his tactical backpack and unzipped it.

...

The moment the zipper was fully unzipped, a series of soft, crisp "click-clack" sounds came from inside the backpack, like the gentle turning of tiny, precise gears.

Immediately afterwards, a tiny head, about the size of a baby's fist and as clear as crystal, cautiously peeked out from the backpack's inner pocket.

On that silvery-white, intricate crystal structure, the Crystal Devouring Beast's round compound eyes were two pools of bright, light gold, staring unblinkingly at the Darkborn corpse not far away, with a tiny glint of crystal light flashing from its mouthparts from time to time.

It looked exactly like someone who was craving something but was too shy to come out.

"What is this?" Wu Yingguang asked, frowning.

"Uh..." Xu Ri Dong Cuo was also stunned when he saw the information on the Crystal Devouring Beast.

"The Crystal Devouring Beast is a type of Star Beast, and it's also my pet. Its name is Xiao Ning."

"You mean you want to feed it the Darkin Core?"

"That's right, it might become an important fighting force for me in the future."

Wu Yingguang pondered for a moment and then nodded.

"Alright, if its growth is helpful to you, then selling you this Darkin Core isn't out of the question. Just use all your mission points from this mission to exchange for it."

"Thank you for your help, Captain Wu."

After reaching a consensus with Wu Yingguang, Chen Feng looked at the Crystal Devouring Beast.

The little guy, who had been timid just moments before, suddenly sprang to life. His eight legs pushed off the edge of his backpack, transforming him into an almost invisible streak of crystal light, and with a "whoosh," he landed beside the old Darkin's corpse!

The moment of landing.

With a soft "click" from its slender leg joints, several micron-sized crystalline blades, as thin as cicada wings and extremely sharp, instantly popped out.

Like a top-notch anatomist, he swiftly cut along the Darkin's bones and energy pathways.

In the blink of an eye, the Darkin Core, sealed by the laws of demons, was precisely extracted from the corpse without leaving a trace of blood or flesh.

However, just a moment after the Crystal Devouring Beast swallowed the Darkin Core...

The little guy, who was swaying his small body and rubbing his mouthparts with his crystalline legs to savor the taste, suddenly froze.

The next second!!

A powerful energy storm suddenly exploded within its body!

It was as if the core, which contained two complete shadow vortexes and was imprinted with the laws of the Desolate Rank Demon, was bursting with extremely surging energy within its body.

Meanwhile, the Crystal Devouring Beast Xiao Ning's originally crystal-clear mechanical legs were visibly tainted with shadow energy, transforming into sharp shadow limbs!