In those years when I was a mortal and a demon

Chapter 683 Refining Spirit Technique, Level 2

"What an astonishing density of spiritual energy!"

"This is... Spiritual Energy Crystallization!"

"Such a blessed place is hard to find even in the spirit world!"

In the valley, Lei Yunzi gazed at the colorful world around him with undisguised excitement. Everywhere his eyes fell, there were countless tiny points of five-colored light.

"It's normal for the spiritual energy of an entire realm to be compressed within this area of ​​tens of miles. There's no need to make such a fuss!" Lu Yuan said calmly, with an attitude of mocking Lei Yunzi for being ignorant of the world.

"Tch, you've only been here before me. Who knows what kind of person you were when you first entered this place? Probably not much better than me, right?" Lei Yunzi rolled his eyes and then looked around.

"Could that be the Cleansing Pool?" Lei Yunzi quickly spotted the emerald green pool in the valley and flew over in a flash.

Seeing this, Lu Yuan, without changing his expression, slowly landed nearby.

"No, this is an illusion!" As a master of formations, Lei Yunzi immediately saw through the illusion upon getting closer.

"Indeed, beneath this illusion lies a separate small space, where the Spirit Cleansing Pool and the Spirit Purifying Lotus are hidden. However, the magic array here was created by the Ancient Demon Ancestor, and I'm afraid—"

Before Lu Yuan could finish speaking, Lei Yunzi had already impatiently headed towards the pond. However, an invisible barrier quickly blocked Lei Yunzi, forcing him back.

"Hmph, I'll test the array formation skills of this ancient demon ancestor." Lei Yunzi snorted coldly, his hands quickly forming hand seals, casting spells into the void ahead, seemingly trying to break the restriction.

"Hey Hey hey!"

"what are you doing!"

"Forcibly attacking the formation might alert those guys from Demon Ape Clan. They're specifically responsible for guarding it, and the leader, Venerable Goose, possesses a magic artifact that can sense the formation!" Lu Yuan quickly and angrily stopped them upon seeing this.

"Don't worry, I'm not that stupid. I'm just testing it with the most basic array techniques. It won't trigger a reaction from the array." Lei Yunzi said as he continued to cast the spell.

Lu Yuan frowned slightly upon hearing this, but seeing that the restriction was indeed as Lei Yunzi had said, without any abnormalities, he was relieved. At the same time, he secretly thought that if Lei Yunzi could really break this formation, it might not necessarily be a bad thing for him.

After all, entering the Cleansing Pool to cleanse one's bones and marrow can transform one's body and greatly enhance one's wisdom.

As the probing deepened, Lei Yunzi's expression gradually became serious.

After a long while, Lei Yunzi sighed, stopped, and turned to look at Lu Yuan:

"As expected of the progenitor of ancient demons, this formation is so complex that it cannot be easily broken. Even a Mahayana-level being would need a Xuan Tian treasure to have any chance of breaking it."

"Don't be too greedy. You've already obtained the Thunder Control Pearl, and now you can use the spiritual energy here to advance to the Fusion stage. For most people, this is an incredible opportunity that they wouldn't encounter in several lifetimes." Compared to Lei Yunzi, Lu Yuan didn't show any disappointment.

“That’s right, I should focus on preparing for my breakthrough to the Fusion stage first.” Lei Yunzi seemed to have taken Lu Yuan’s words to heart and nodded in agreement.

Afterward, Lei Yunzi stopped worrying about the difficult-to-break formation, casually found a place to sit down cross-legged, and began to adjust his state.

Seeing that Lei Yunzi was no longer fixated on breaking the formation, Lu Yuan secretly breathed a sigh of relief. He looked around, his gaze lingering on the pond for a moment. Suddenly, he took out some array flags and planted them around the pond.

"What are you doing?" Lei Yunzi asked, somewhat curious.

"With your expertise in formations, you should be able to tell that the formation I'm about to set up is extremely rudimentary, easily broken even by a Qi Refining cultivator. But the beauty of this formation lies in the fact that any interference will be detected by the person holding the main formation flag from dozens of miles away. So you should understand my purpose in doing this." Lu Yuan raised an eyebrow slightly, looking at Lei Yunzi with a half-smile.

"You're judging a gentleman by your own petty standards!" Lei Yunzi snorted coldly and closed his eyes.

"Hmph, whether I'm a villain or not, and whether you're a gentleman or not, we both know the answer." Lu Yuan scoffed at Lei Yunzi.

The purpose of setting up this formation was naturally to prevent Lei Yunzi from making any underhanded moves while he was away, as Lei Hai was only a few dozen miles away. If there was any abnormality in the formation, Lu Yuan could arrive in a short time.

Of course, if Lei Yunzi really had the ability to break the formation set up by the ancient demon ancestor in the blink of an eye, Lu Yuan would have nothing to say.

After setting up the formation, Lu Yuan stayed for another half a day. Seeing that Lei Yunzi had entered a meditative state and had no intention of paying attention to him, he then flew out of the valley.

After returning to the vicinity of the Thunder Sea, based on his previous experience and insights from exchanging ideas with Lei Yunzi, Lu Yuan placed the already materialized Immortal-Slaying Flying Knife within the Thunder Sea and then manipulated the lightning arrays to begin tempering it.

And so it went until a year later, when the tempering process of the Immortal-Slaying Flying Knife gradually stabilized, and Lu Yuan no longer needed to focus his energy on it.

However, he still couldn't leave for too long during this period. Lu Yuan once took some time to return to the valley to check on Lei Yunzi's situation. That guy had already begun to use the spiritual energy in the valley to solidify his foundation, and it was estimated that he could try to break through to the Integration Realm within three years at most.

"I should also try the second level of the Spirit Refining Technique." Lu Yuan murmured to himself, then sat cross-legged beside the sea of ​​lightning, closed his eyes, and immersed his mind in the second level of the Spirit Refining Technique, beginning to carefully comprehend it.

After absorbing the second Nascent Soul, Lu Yuan's primordial spirit had already grown considerably, so he was naturally able to withstand the amplification of divine sense brought about by the second level of the Divine Refinement Technique.

The second level of the Divine Refining Technique is far more profound than the first level. It is extremely difficult to comprehend it completely. Ordinary people would not even dream of it without hundreds of years of dedicated study.

However, Lu Yuan possesses the primordial spirit insights of the Insect Mother, which naturally saves him a great deal of time.

Six years later, the situation on Bitter Spirit Island changed drastically, and strange phenomena appeared in the sky.

Lu Yuan, who was comprehending and cultivating the second level of the Divine Refinement Technique, glanced at it, and then closed his eyes again as if nothing had happened.

"Tsk tsk, it seems his essence is still lacking. This time it's probably going to be a disaster."

Sure enough, the celestial phenomenon lasted for less than half a day before abruptly disappearing.

Inside the valley, Lei Yunzi opened his eyes, but there was no regret on his face.

"Very good, it's basically the same as I expected. Next time will be the time for me to advance to the Fusion stage."

More than ten years later, a fierce wind arose over Bitter Spirit Island, dark clouds gathered, thunderclouds rolled, and a chilling aura spread down from the sky.

"What's going on?" Lei Yunzi was suddenly awakened from his meditation, looking at the sky with a look of horror.

He was not yet ready to begin his second attempt at merging, so this celestial phenomenon was naturally not something he had summoned.