I, a prison guard in the Heavenly Prison, secretly became invincible thanks to the system.

Chapter 457 Yin Sha Beast Core

Ye Kang returned to the courtyard and began his secluded cultivation.

After eight days, his cultivation and martial arts skills were completely stabilized.

That day, after having a meal with the Carp God, he used the Thousand Faces Transformation technique to transform into Liu Ci's appearance once again.

Because the Nourishing Spirit Technique grants him a divine sea far greater than that of martial artists of the same level, it makes it easy for him to disguise his cultivation level.

He only revealed his cultivation level of nine leaves and calmly walked out of the sect.

Along the way, as expected, there were many unfriendly glances, but Ye Kang ignored them and headed straight for Tyrant Whale City.

The demonic invasion did not cause any changes to this prosperous city; warriors continued to come and go in an endless stream.

Relying on his memory, Ye Kang once again arrived at the magnificent Linglong Chamber of Commerce branch.

As soon as he entered, a tall figure came down from the second floor. Ye Kang had an idea and walked over.

"Miss No. Seven, it's been a long time."

That's right, this tall saleswoman is none other than No. 7, whom I met on my first visit, and the one who took me to the Tang family.

The latter paused for a moment, then tentatively asked, "Do I know this distinguished guest?"

"Fellow Daoist, you are truly a person of great importance who has a short memory."

Ye Kang smiled slightly and handed over his membership jade token.

Number Seven sensed the area and immediately realized what was happening.

"It's you!"

"I remembered?"

"Why do you look so different? I can't believe it at all..."

"It's just a little trick. You once said that I should come more often to help you increase your sales. Sorry, it's been so long since I've come."

Ye Kang cupped his hands slightly, and his words were like a gentle breeze.

Number Seven raised an eyebrow: "That's great. My performance has been particularly poor lately. What do you need? I'll introduce you to it."

Ye Kang then handed over a jade slip, which contained his requirements.

Treasures or precious plants related to the underworld.

Elder Mo said that the Tyrant Whale Sect didn't have it, so we could only try our luck at the Linglong Chamber of Commerce.

Sure enough, Number Seven nodded immediately after a quick glance: "These kinds of things are not very common, and there is basically no market for them in the Coral Islands. However, we have a few of our best-kept secrets here, so you can take a look."

After saying that, Number Seven led Ye Kang upstairs to the second floor.

Ye Kang was completely confused. Why did she sound so strange? Had she been to places outside the Coral Islands?

Although he found it strange, Ye Kang didn't ask any questions and simply followed Number Seven to the very back of the merchandise display case.

Unlike the dazzling array of goods in front, the items piled up here are all extremely niche products, many of which have been untouched for decades.

Number Seven took out a jade slip and counted the items while referring to the list inside.

"Row 34, Column 5, Layer 6... Got it!"

She immediately pulled open one of the boxes and reached inside with her right hand.

This box was extremely mysterious. Ye Kang could only see pitch blackness, and his divine sense was completely disabled, so he had no idea what the structure inside was.

"A forty-year-old red spider lily, produced in an extremely yin place, possessing a portion of the aura of the underworld. Are you satisfied, esteemed guest?"

Ye Kang took a jade box, inside which was a red spider lily.

【Ding】

[Shenwu Forge Tip: Red spider lilies over 200 years old can be used to strengthen the Azure Blade]

Ye Kang's eyebrows twitched, and he smiled, "Good stuff, but it's a pity it's too young."

Number Seven nodded and said, "Yes, but there's really no one who needs it here. This forty-year-old plant has been sitting here for a long time. It's okay, we have other things."

Number Seven clenched her fist, seemingly to cheer Ye Kang on, but it looked more like she was encouraging herself.

"The next item is... the Yin Sha Beast Core. Legend has it that this beast originated in the Yellow Springs, and it enjoys devouring human souls. It is extremely Yin in nature and contains a beast core. Judging from its size, its quality is on the thirteenth floor!"

As she spoke, she flew up and pulled out a box from the thirteenth floor.

He took out a gray beast core that emanated a malevolent aura.

Ye Kang took it, and the system notification sounded again.

【Ding】

[Divine Martial Furnace Notification: Yin Sha Beast Core detected, which can be used to enhance the Azure Sky Blade]

Ye Kang was immediately delighted: "This is it, I'll take it."

Upon hearing this, Number Seven immediately jumped up excitedly: "Great! Our distinguished guest is truly generous, taking a treasure worth millions just like that! This will definitely boost my sales performance for this month!"

"What! Young Master Duo!?"

Ye Kang was stunned. A million-level beast core?

Number Seven nodded: "That's right. This Yin Sha Beast Pill was taken from the body of a Yin Sha Beast in the Divine Sea Realm. It is usually calculated based on high-grade spirit crystals, which is about one million low-grade spirit crystals."

Ye Kang unconsciously swallowed. After touching so many storage bags, his total wealth was only less than two million low-grade spirit crystals.

Unexpectedly, half of this beast core was spent immediately.

"If it's settled in high-grade spirit crystals, how many would it cost?"

"That's not expensive, a thousand high-grade spirit crystals will do."

"A thousand to one!"

Ye Kang was stunned; this exchange rate was outrageous.

After much deliberation, Ye Kang looked at several other treasures, but none of them were as good as this Yin Sha Beast Pill. Helpless, he still spent one million to buy it.

Not only was No. 7 happy, but even the branch owner said he hadn't seen such a big scoundrel in a long time, who actually bought something that no one had wanted in the store for decades.

Amidst a warm farewell, Ye Kang left the Chamber of Commerce with tears in his eyes.

On the way, he didn't hesitate for a moment and used the thing directly.

【Ding】

[Divine Martial Furnace Notification: Confirm use of Yin Sha Beast Pill to upgrade Azure Sky Blade]

【Ding】

[The Azure Blade has been successfully enhanced and has acquired the new attribute "Azure Netherworld".]

[Azure Heaven and Yellow Springs: Greatly increases the intensity of sword energy, upgrades the frost erosion attribute of sword techniques, and doubles the damage to ghosts since the Yin Sha Beast feeds on souls]

"Ok?"

Ye Kang looked at the brand-new Biluo Blade and felt the chilling aura of Biluo within it.

I never expected the Yin Sha Beast Pill to have such a wonderful use, actually possessing special damage against ghosts.

But it's not very useful now.

Ye Kang was not annoyed. He put away the Azure Sky Blade, then suddenly thought of something and probed the ancient black jade treasure with his divine sense.

The moment the two pieces were combined, Ye Kang discovered the secret within them.

Above the Ancient Treasure Space, there is an inscription of a martial arts manual called "Thunder in the Palm".

It looks incredibly powerful, but it's something you can't learn before reaching the Divine Sea Realm.

I can learn it now, but I've lost my aptitude, so I can only put it aside for now.

Ye Kang sighed. The task was arduous and the road ahead was long; in the end, he still lacked comprehension.

……

In a flash, another two days passed.

On the tenth day, good news finally came from the Demon Forge.

【Ding】

[The Demon Forge Successfully Refines the Man-Eating Demon: Red-Eyed Bear King]

[Congratulations, host, you have obtained 2800 Demon Blood Crystals and 1 Demon Blood Core from the Divine Sea Realm]

[Congratulations, host, you have obtained a top-quality fur coat, two rare bear paws, two large buckets of demon blood essence from the Divine Sea Realm, and two bear teeth.]

[Congratulations, host, you have obtained the Demon Body Refining Technique: Bear Demon Overlord Body Technique]