The Nether Tree absorbed this energy, and it seemed to emit a very small amount of Netherworld's Qi.

Song Yan squinted for a moment and thought to himself: "If this thing really grows up, wouldn't that be a problem?"

However, when he got the tree, he had already refined it at the first opportunity. Although the tree was evil, it was now bound to him.

"It's just that this tree needs life energy, and I also need life energy."

Song Yan was a bit speechless, then immediately grabbed a corpse of an Earth Beast and started skinning it on a nearby rock.

After the skin was removed, he threw the beast's corpse into the sacrificial array and began making a shadow puppet.

However, after some operations, he unexpectedly found that the Celestial Calamity Beast seemed extremely special; skin making couldn't summon a soul. This was the first time he failed to make a shadow puppet using beast skin.

Thus, he threw this half-finished shadow puppet and all the Earth Beasts' corpses into the sacrificial array, piling it full over the entire array shield.

As time passed...

Days later.

An entire boatload of Earth Beasts had been refined into life energy.

Song Yan allocated a bit to the Nether Tree, and devoured the rest himself.

The rich life energy entered his body, making him feel an indefinable transformation within.

He moved his palm, bringing out the "Free Celestial Demon Map" again, only to see that the eyes of the elegant, white-robed immortal on the map naturally gained one or two deeper lines. At the same time, he felt his eyes itching. He rubbed them instinctively, but the itch didn't fade, as if it was rooted in his bone marrow or even his divine soul.

"Where exactly did this energy go?"

Song Yan clenched his fist, applied his technique, and found that neither his physique nor magic had strengthened.

Suddenly, the words of the Killing Demon Monk echoed in his mind.

"When I was in another Cultivation Realm, I was just a small evil thought. By chance, I grew to my current level and came to this Cultivation Realm. This time, I want to become stronger, to be a higher-level celestial demon."

In an instant, he understood.

Devouring life energy can help one become a higher-level celestial demon.

But this method isn't efficient.

Otherwise, an evil thought, wandering another Cultivation Realm until its destruction, would only grow into a Killing Demon Monk.

This showed how much energy is needed.

Monks have many precepts: against deceit, against killing, against theft, against lust...

There are monks who understand the true meaning of deceit and the true meaning of killing, and the Killing Demon Monk mentioned one who mastered the true meaning of theft, suggesting there might be others.

When all true meanings are gathered, the monk might become a so-called "higher-level celestial demon," which likely lies beneath the Obsession Layer in the Sea of Suffering.

Compared to life energy, absorbing similar beings is more efficient.

But crossing different species shouldn't work.

The Nine-Child Demon Mother couldn't devour a demon monk, and vice versa.

But suddenly, Song Yan thought of the Changwang Melting Furnace and couldn't help but laugh "hehe."

He had intercepted the aura of one child of the Nine-Child Demon Mother with the Changwang Melting Furnace, making it his own.

"In this way, the future is hopeful."

...

...

Song Yan walked out of the cave to a starry sky. He sat cross-legged, letting the bright moonlight shine on him. The snowy mountains reflected the light, momentarily making his Profound Robe appear white, leaving one to wonder if he was black or white.

Whether genuine emotion, indulgence, saving people; or killing demons, slaughtering beasts; or merely sitting alone at this moment, all allowed him to feel different joys.

Buddha said that the realm is created by the mind, and Song Yan felt this also applied to demons.

Wanting freedom means being free; if one has to do something to prove freedom, then it's nonsense; if one has to define freedom with a name, that's nonsense too; saying it is something means missing the point, a truly free heart is the root. Freedom doesn't need guard, for what is guarded is nonsense, not freedom.

"Hahaha!"

Song Yan gained insight and laughed, then with a thought, connected with Ningxin Old Ancestor using a pre-set thought, asking: "Old Ancestor, you're very knowledgeable about herbalism, is there Demon Gathering Grass?"

After a while, Ningxin Old Ancestor responded in thought: "Different demon beasts are attracted by different things, which one do you need?"

Song Yan said: "I need... something that can attract the Celestial Calamity Earth Beast."

After a long silence, Ningxin Old Ancestor responded: "I'll see what I can find."

Song Yan said: "I've always been lucky, sorry for the trouble, Old Ancestor."

After speaking, he closed his eyes to rest.

The starry sky shifted, dusk and dawn alternated...

A month later, the entire East Corner City was relocated.

Two months later, Song Yan could no longer perceive a single person with his divine sense.

Three months later, life was scarce in the entire area.

He sat like a lone island in a Celestial Calamity zone.

On this day, he heard the voice of Ningxin Old Ancestor in his mind.

"Celestial Calamity Beasts are extremely unique; there is no plant in this world that can attract them, the only means..."

"Netherworld's Qi."

Before Ningxin Old Ancestor could finish, Song Yan already spoke the answer himself, glancing towards the Yin Mansion Sacrificial Array, pondering slightly, then opened the array shield a little...

A wisp of Netherworld's Qi immediately spiraled upwards, reaching through the sky...

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