Such a high-grade Storage Pouch surprisingly contained only two items.

One was the Magic Treasure 'Profound Ghost Double Hooks' that Su Ke had used in Dark Demon Valley.

The other was an irregular, jet-black, shiny crystal the size of a fist.

"Could it be 'Dark Fire Crystal'?"

Yang Che naturally immediately recalled that in Dark Demon Valley, Su Ke had personally told the Double-Headed Fire Rock Snake.

If he and Senior Sister killed Yang Che, Su Ke would give the Dark Fire Crystal to the Double-Headed Fire Rock Snake.

Thus inferring, this item was clearly the 'Dark Fire Crystal' that Su Ke mentioned.

Holding it in his hand and studying it carefully, Yang Che sensed that this crystal contained extremely pure dark-attribute and fire-attribute Spiritual Qi.

Upon discovering this, Yang Che originally intended to circulate the Heaven and Earth Chaos Art to completely devour and absorb all the dark-attribute Spiritual Qi within it.

However, his thoughts raced, and he immediately stopped.

He transmitted a message to Nine Heart Thunder Flame: "Lei Yan, refine this crystal and see."

Nine Heart Thunder Flame instantly surged out, immediately enveloping the Dark Fire Crystal in Yang Che's hand, and began to refine it.

Soon, the Dark Fire Crystal gradually melted.

It turned into a highly viscous, thick substance.

This viscous substance strangely kept changing shape within the Lei Yan's fire, but it could never completely melt.

Seeing this, Yang Che remembered what Tianxie Ziyin had told him when she taught him Artifact Refining, and he couldn't help but beam with joy.

A viscous substance that can be tempered by powerful flames but never completely liquefies is often an excellent Artifact Refining Material.

Such Materials often increase the 'toughness' of Magical Artifacts and Magic Treasures, significantly improving the inherent toughness and defense of the refined Magical Artifacts and Magic Treasures.

Yang Che had been searching for dark-attribute Materials to repair the tiny nicks on Sword Four's ancient sword blade, and at the same time, to give Sword Four some more 'unpredictable' abilities.

Undoubtedly, this 'Dark Fire Crystal' before him was the excellent Material he was looking for.

With a thought, the 'Sword Four Ancient Sword' in his Lower Dantian immediately flew out.

Nine Heart Thunder Flame and Yang Che were connected telepathically, so it naturally understood Yang Che's meaning.

It immediately controlled the viscous substance formed from the Dark Fire Crystal and enveloped Sword Four's blade.

Then, Lei Yan enveloped both of them completely, and under Yang Che's mental control, began the smelting process.

With the addition of one heart, the Nine Heart Thunder Flame's flame power also greatly increased. This time, Yang Che clearly felt that the smelting speed was much faster than before.

Several hours later, the Dark Fire Crystal had slowly integrated into the Sword Four Ancient Sword's blade.

Gradually, Yang Che suddenly discovered a strange phenomenon.

Sword Four, which had already turned completely black, simultaneously possessed a strange aura of both extreme cold and intense heat within its blade.

Yang Che knew that the icy cold Qi was produced by Sword Four after he had previously smelted a Blue Stone Magical Item.

But now, it surprisingly had an additional fiery heat within it. As a result, the two immediately created a 'mutually restrictive' force.

Moreover, the fiery heat increasingly gained the upper hand, and soon gradually and completely melted away the icy cold Qi.

Yang Che's expression was calm, and his heart did not stir much.

Melting in the Blue Stone Magical Item back then was just an attempt.

The Blue Stone Magical Item was only a Pill-grade Magic Treasure, its rank was relatively low.

And Yang Che had always been very clear that, just speaking of the two attributes of ice and fire, the fire attribute was relatively more compatible with the dark attribute.

Now that the cold in Sword Four was completely melted away, it also proved that the rank of this Dark Fire Crystal was far superior to that of the original Blue Stone Magical Item.

This further highlighted the importance of good Artifact Refining Materials.

The smelting continued like this.

After several more hours, the Dark Fire Crystal finally completely melted into the Sword Four Ancient Sword.

Yang Che was delighted to find that Sword Four's blade was indeed significantly repaired.

Moreover, holding Sword Four and casually swinging it, faint flames still lingered around the blade.

Not only that, Sword Four's toughness also improved.

Greatly satisfied, Yang Che re-stored Sword Four into his Lower Dantian. At this moment, he suddenly felt a bit dizzy, and his desire to drink heaven soul wine also became intensely strong.

Only then did he remember that he had drunk a lot of heaven soul wine when fighting Su Family Old Ancestor Su Tian, and now the side effects of heaven soul wine were kicking in.

No longer continuing to check the Storage Pouch, Yang Che re-stored all the Storage Pouches in front of him, then quickly walked to the soul nourishing wood.

He first carefully cut off a small section, simply processed it, and then hung it directly around his neck.

This way, the soul nourishing wood could continuously nourish and strengthen his soul and Primordial Spirit, allowing his Divine Sense to slowly grow stronger as well.

Next, he cut off a small section of withered branch, then quickly exited the Void Illusion Magic Stone Space and found his Senior Sister Shentu Yun.

Shentu Yun was stunned when she heard that Yang Che wanted to refine Soul Stabilizing Pill himself, and she said with some disbelief, "Little Junior Brother, are you sure you're going to refine the Soul Stabilizing Pill yourself?"

Yang Che nodded heavily, and quickly said:

"Senior Sister, we are still missing two kinds of medicinal ingredients for refining Soul Stabilizing Pill, we need to look for them in the market. And I also need a slightly better Medicine Cauldron."

Shentu Yun was still somewhat incredulous that her Little Junior Brother could perform Alchemy.

Because a Cultivator's Lifespan and energy are, after all, limited.

Most of their life must be spent on Cultivation.

And outside of Cultivation, it is extremely difficult to achieve a relatively high level of mastery in even one of Alchemy, Artifact Refining, Talisman Making, or Formation.

For example, she herself had been stuck at the Core Formation Great Perfection Cultivation Bottleneck for many years precisely because she had spent so much time and energy on the 'Dao of Talisman Making'.

And how old was this Little Junior Brother in front of her?

Not only had his Cultivation reached Early Golden Core Stage, and he had considerable mastery in the Dao of Formation, but he could also perform Alchemy?

And Little Junior Brother also wanted to learn Talisman Making from her!

This couldn't help but surprise Shentu Yun, and at the same time, she was somewhat worried about whether Little Junior Brother's energy would be sufficient.

"Senior Sister?"

Yang Che saw that Senior Sister seemed a bit distracted, and immediately called out.

Shentu Yun was startled, then came back to her senses, and immediately sent someone to gather the missing medicinal ingredients, and at the same time bought the best Medicine Cauldron from the 'Dark Market' and brought it back.

Yang Che didn't delay. After adjusting his spirit, Qi, and mind to an excellent state, he immediately began to refine 'Soul Stabilizing Pill'.

Seven days later.

Yang Che's first batch of Soul Stabilizing Pill was refined.

With the increased power of Nine Heart Thunder Flame and the improved quality of the Medicine Cauldron, Yang Che's success rate for refining Soul Stabilizing Pill this time directly increased to fifty percent.

Taking advantage of this good state and feeling, Yang Che continued to refine…

Another month passed.

Yang Che had successfully refined thirty-two bottles of 'Soul Stabilizing Pill'.

He directly gave sixteen bottles to Senior Sister and kept sixteen bottles for himself.

After taking the Soul Stabilizing Pill, the side effects of the heaven soul wine in his body indeed quickly disappeared.

This made Yang Che marvel, and at the same time, he admired Old Ancestor Old Man even more.

After resolving the side effects of the heaven soul wine, Yang Che returned to his residence, set up a Divine Sense Induction Formation, re-entered the Void Illusion Magic Stone Space, and continued to count the Storage Pouches he had obtained.

When he sorted through the Storage Pouch of the Middle-stage Jindan Elder, Su Ping of the Su Family, Yang Che was once again overjoyed.