After the destruction of the Immortal Realm, I took in the fallen fairy.

"Refine demonic energy?"

Song Jingyu nodded almost without hesitation: "Of course! My mother told me in a dream that I am the heir of an ancient sect, and the source fire rules of my fire spirit root are purer than those of ordinary fire spirit root fairies."

Have you tried it?

"Uh-huh!"

Song Jingyu continued, "Including the Rock Armor Demon Bear from before, and the monsters from those previous demonic tides, they were all refined by my flames!"

"..."

That's what they call burning to ashes!

Lin Heng rolled his eyes speechlessly.

"Master, are you thinking of... refining the demonic energy within that fox fairy's spiritual root?"

At this moment, Yun Qinghe put down the stone bricks and came over.

"right."

Lin Heng nodded.

"So, the teacher wanted to refine the demonic energy within the fairy's spiritual root?"

Upon hearing this, Song Jingyu said somewhat embarrassedly, "That might not be feasible. I'm afraid if I put a flame on her, I'll burn that fairy to a crisp..."

"However, it should be feasible to use the flames of a fire spirit fairy for refining."

After pondering for a moment, Yun Qinghe said, "Back in the sect, the sect leader personally did this kind of thing."

"Your sect leader?"

Lin Heng looked at her in surprise.

"Yes, our Yunling Sect's Sect Master is also a fairy with a wood elemental root."

Yun Qinghe continued, "Although it was for refining immortal pills at that time, I could clearly tell from the side that the sect leader was using the spiritual energy of the wood spiritual root to guide the spiritual energy of the fire spiritual root to generate the furnace fire."

"Under the sect leader's guidance, the flames generated by the fire spirit root fairy will systematically refine the medicinal herbs in the cauldron one by one. As long as it's not the turn of the next type of herb, the flames will not harm them."

"but……"

As she spoke, Yun Qinghe paused for a moment.

"But what?"

Lin Heng asked with ease, because with Yun Qinghe's explanation, he was actually able to simulate the entire refining process in his mind!

Judging from the information in the Immortal Slave Manual that provided him with knowledge about array construction, this was utilizing the compatibility between the Source Wood Rules and the Source Fire Rules...

"If it were me, I probably wouldn't be able to do it..."

Yun Qinghe said somewhat dejectedly, "The sect leader said that this is something that can only be achieved by having a thorough understanding of the rules of the Origin Wood, allowing the two rules to merge."

"The power of rules?"

Upon hearing this, Lin Heng's lips curved into a slight smile.

Just now, he had already formed a mental image based on his understanding of the Five Elements Rules.

The rules that were once explored by countless cultivators in the immortal realm seemed so simple and easy to understand in Lin Heng's eyes.

Unfortunately, it seems he traveled to the wrong era.

If he had come to this world during the Immortal Ancient Era, given his understanding of the power of rules, he would probably have at least reached the Enlightenment Realm...

But since we're here, we might as well make the best of it. Using our understanding of the power of the rules to cultivate celestial servants who are absolutely obedient to us is not a bad idea.

In some ways, it even saves him the trouble of doing it himself...

After a brief moment of regret, Lin Heng said to Yun Qinghe, "What if I could guide you through this process?"

"Master, can you guide me?"

Yun Qinghe suddenly realized.

Yup!

Their master is an unfathomable array builder.

What array builders are most proficient in is the application of the Five Elements Rules, isn't it?

"That should be possible!"

Yun Qinghe nodded immediately.

Suddenly, she paused and whispered to Lin Heng, "Then, Master... are you planning to bring that fox demon fairy over as well?"

"No rush."

Lin Heng shook his head.

As things stand, Lin Heng himself isn't very confident about using Yun Qinghe and Song Jingyu's two types of rule-based power to refine demonic energy.

Because the most important thing here is not the source fire rule, but the source wood rule that serves as a guide.

If one can fill their entire territory with Originium Rules, then guiding it will be much smoother.

Of course, more importantly, Lin Heng was not in a hurry.

Because he knew that there were others who were even more anxious than him to refine demonic energy...

As the stone bricks were brought in, Lin Heng began to squat in front of the newly built house and set up the Fiery Camp.

The formation was successfully completed in about half an hour.

Standing up, Lin Heng let all the fire spirit root fairies into the room, then directed Song Jingyu to stand next to the array eye and place a spirit stone in the array eye.

As a fiery red light engulfed the spirit stone, Song Jingyu clutched her chest in surprise, feeling the budding of her spiritual root.

"This feeling..."

She looked up at Lin Heng in disbelief: "Teacher, it feels like I'm back in the cave protected by the tree babies!"

Lin Heng nodded: "Yes, the spiritual energy emanating from your spiritual root contains the purest source fire rules."

"Young Master Lin!"

At that very moment, the fire-elemental immortal servants inside the house also arrived at the door.

"Don't come out."

Lin Heng immediately reminded him, "Wait until the spirit stones are used up."

"I...we understand..."

The fire-elemental fairies inside the room immediately stopped and looked at Lin Heng gratefully: "But Young Master Lin, we feel like we've recovered some of our spiritual power!"

They hadn't experienced this feeling of being infused with spiritual energy in a long time.

The excitement they felt at this moment even surpassed that of when they first attained immortality.

And they all knew that the reason their spiritual roots had been able to revive was entirely because of the person before them, their greatest master...

"You will spend about an hour here every day. From now on, this will be your main job."

Lin Heng looked at the purpose of the Blazing Fire Camp.

Like the Spring of Immortal Spirits, no matter how long you stay there, there will be no further improvement.

One hour is the limit that the Fiery Camp can use to revive the fairies' spiritual roots.

And most importantly, an hour of recovery will allow the spiritual energy in their bodies to be maintained for a full day.

If you come to the Fiery Camp to replenish your spiritual power every day on time...

These fire spirit root fairies will always possess the strength of the original fairies!

puff.

At this moment, the fire spirit fairy inside the house knelt down at the door and faced Lin Heng.

Work?

If nourishing their spiritual roots to the point of trembling with awe by their masters is considered work, then they would rather work for their masters for their entire lives!

They looked up at Lin Heng with grateful eyes and said, "Thank you, Master!"

……

It was evening.

Led by Song Jingyu, the Fire Spirit Root Fairies also emerged from the Blazing Fire Camp.

The only pity is that the strength restored to the fairies by the Fiery Camp is very limited, barely enough to allow them to exert the strength of the Foundation Establishment Realm.

However, it is definitely enough for the Demon Calendar years when spiritual energy is depleted.

To Lin Heng's surprise, Song Jingyu, who also had a fire spirit root, was able to recover her strength, which was still at the Spirit Realm level!

Although it is only the early stage of the Spirit Realm.

Even so, the effects of Song Jingyu being in the Fiery Camp already surpassed those of being immersed in the Immortal Spring.

So, fairies recognized by the Celestial Slave Handbook are indeed more valuable...?

Lin Heng thought to himself.

At that moment, a fairy hurriedly came from the other side of the tunnel: "Young Master Lin, all the spirit stones have been placed in the underground cave."

"very good."

Lin Heng nodded slowly: "Then next up is the Oasis in the Clouds..."

However, just thinking about the amount of work involved in constructing the cloud oasis gave him a headache.

Only he could arrange and construct the array; no immortal servant could do it for him.

Even if they only have a rudimentary understanding of array construction, Lin Heng can reduce his workload by giving them instructions.

It seems I'll have to take Yun Qinghe with me tonight, ready to let her wood elemental root help me relax at any time...

"hey-hey."

Suddenly, a white-haired figure jumped out from the side.

Tian Qianchen approached with a pen and paper in hand: "Little teacher, are you done with your work today? Could you give me some more pointers on array construction?"

"Oh?"

In an instant, Lin Heng's eyes lit up.

He looked at Tian Qianchen with a smile and said, "Elder Tian, ​​are you trying to learn array formation again?"