The Ximen Clan's estate was vast, lush with greenery, and surrounded by flowing waters. Under Ximen Guai's guidance, Qin Yang traversed the estate.

Along the way, the estate's guards and servants, seeing the clan's council leader Ximen Guai diligently leading a young man, all showed expressions of surprise and looked at Qin Yang with increased respect.

The central building of the Ximen Clan estate was a luxurious castle, and the two walked to the back of the castle.

Behind the castle was a lush forest, shaded by greenery, with the crisp sound of birds chirping.

As soon as Qin Yang stepped into this forest, he felt that it was not as serene and peaceful as it appeared on the surface – there were some people secretly guarding it.

The two moved forward, and in this verdant forest, there was a tranquil spring, at the center of which was a large rockery.

"Young Qin, the clan's treasure vault is beneath that rockery."

Ximen Guai pointed to the rockery in the center of the spring.

"Alright, let's go."

Qin Yang nodded. He wasn't afraid of any tricks Ximen Guai might play, after all, Ximen Guai still had a Poison Spirit Talisman on him, unless he didn't want to live.

The two of them leaped across the spring, landing at the entrance of the rockery. Ximen Guai twisted a protruding rock several times, and a hidden door opened.

Inside the hidden door was a stone stairway leading underground.

The two descended thirty meters down the stone stairway, where a corridor built with thick stone walls and slabs appeared, illuminated by fluorescent stones emitting light.

Qin Yang and Ximen Guai reached the end, where a heavy steel door stood. Ximen Guai inserted a key and opened that steel door.

Inside the chamber, the first thing that caught the eye were several rows of stone shelves.

On the stone shelves were various martial skills and heart methods, precious collections the Ximen Clan had gathered over hundreds of years, some of which were attractive even to Celestial Tier experts.

However, as a cultivator, Qin Yang naturally wasn't interested in these martial skills and heart methods.

Behind these rows of stone shelves was a fifty-square-meter flat stone platform, with several sword and saber racks at the front.

On the sword and saber racks lay sheathed treasure swords and treasure sabers.

Qin Yang, being a sword cultivator, casually grabbed a treasure sword and drew it from its sheath. The blade was sharp, exuding a chilling gleam.

However, unfortunately, none of these treasure swords had even a trace of spiritual power fluctuation, clearly not even lower-grade treasures.

The weapons used by cultivators are divided into treasures, spiritual treasures, and magical treasures, each level further divided into upper, middle, and lower grade.

The Purple Blood Soft Sword in his hand contained a trace of spiritual beast blood within its blade, possessing spiritual power fluctuations, and had thus entered the category of a treasure, considered a lower-grade treasure. The White Jade Flying Saber was also a lower-grade treasure.

Treasures cannot change size, whereas spiritual treasures are different.

The Purple Jade Pill Furnace Qin Yang possessed was a spiritual treasure that could change size upon the infusion of spiritual power, making it the most precious treasure in Qin Yang's possession.

"Young Qin, if you fancy any of these treasure swords, feel free to take them."

Ximen Guai said respectfully.

Qin Yang shook his head. Although these treasure swords were rare weapons to ancient martial artists, they were of no use to him.

Behind the sword and saber racks, on the platform, twenty wooden boxes were neatly arranged, adorned with ancient-style carvings.

"Young Qin, these boxes contain the crystal cores the Ximen Clan has collected over the years."

Ximen Guai's old eyes lit up as he spoke.

In front of these wooden boxes were the names of various demon beasts. Ximen Guai quickly searched with his eyes, and a look of great joy suddenly crossed his old eyes.

"Young Qin, there's actually a crystal core of a Red Fire Poison Scorpion here."

Ximen Guai said joyfully to Qin Yang.

At this, Ximen Guai took the wooden box and opened it, revealing a crimson rhomboid crystal core inside.

"Not bad, this Red Fire Poison Scorpion's crystal core will be useful."

Qin Yang nodded, remarking that Ximen Guai's luck wasn't too bad, as it turned out there was indeed a scorpion-type crystal core among them.

Crystal cores have two primary uses: one is for refining elixirs, as crystal cores contain violent energy that humans cannot ingest directly, thus needing to be refined into elixirs; the other is for feeding mount and demon pets, as demon beasts can enhance their cultivation through consuming the crystal cores of other demon beasts.

Qin Yang possessed a Fire Flame Lion and a yet-to-hatch Flying Thunder Eagle, so fire attribute and thunder attribute crystal cores were quite useful to him.

"Fiery Fire Wolf's crystal core, Fire-tailed Fox's crystal core, Flame Violent Bear's crystal core, hmm, there's also a Lightning Leopard and a Thunderlight Mink crystal core. A total of three fire attribute crystal cores and two thunder attribute crystal cores."

A bright light shone in Qin Yang's eyes as he picked up the wooden boxes containing these demon beast crystal cores and placed the five crystal cores into one box.

With these three fire attribute crystal cores, the Fire Flame Lion wouldn't take long to break through to the rank of an Earth-tier demon beast, and these two Thunder Element cores would also facilitate the Flying Thunder Eagle's rapid growth.

"Ximen Guai, I'll be taking these crystal cores. You don't have a problem, do you?"

Qin Yang looked at Ximen Guai and said.

Upon hearing this, a pained look flashed across Ximen Guai's old face. Demon beast crystal cores were quite rare, and each one was a treasure. The Ximen Clan had accumulated only about twenty over so many years.

However, Ximen Guai immediately cursed himself for being foolish in his heart. His life was already in the other's hands, so there was no point in feeling heartache, especially when his hidden ailment that had tormented him for most of his life still needed Young Qin's help.

Recognizing his position, Ximen Guai quickly came to terms with it.

"What's ours in the Ximen Clan is naturally Young Qin's to take."

Ximen Guai said with a smile, respectfully.

"Alright."

Qin Yang nodded, finding Ximen Guai's attitude satisfactory, as some people didn't recognize their own position.

In this treasure vault, whether martial skills, heart methods, or treasure swords, they were treasures to ancient martial artists but held little use to Qin Yang.

Qin Yang wandered again in the treasure vault, his gaze suddenly falling on an iron box in the corner.

"What's inside there?"

Qin Yang pointed to the iron box and asked.

"That iron box has been there for a long time, I remember it containing some stones."

Ximen Guai frowned, unsure, as it had been a while since he'd been to the treasure vault.

"Some stones?"

Qin Yang raised an eyebrow, walked over, and opened the iron box.

Upon opening the box, Qin Yang's eyes immediately lit up brightly. He was most familiar with the contents inside.

"These are... Spirit Stones!!"

Qin Yang's eyes were full of surprise and amazement. He exclaimed in his heart upon recognizing the spirit stones stored within the iron box.

Spirit Stones were the most common currency on the Immortal Yuan Continent and an indispensable aid for cultivators during cultivation. They contained abundant spiritual energy that cultivators could directly absorb.

Trading among cultivators is conducted using spirit stones, akin to the role money plays on Earth. However, while money on Earth is just pieces of paper, spirit stones, besides being used for transactions, can also be used by cultivators for cultivation to enhance their cultivation level.

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