Gao Xuan also went through thousands of experiments to find this most efficient way of fighting.

The Eternal Celestial Dragon Claw can absorb the Ultimate Yin Filthy Qi, but the Qi in the Cave of Ten Thousand Demons is too turbid and chaotic. Transforming it with the Eternal Hell Seal is very troublesome and inefficient.

Thus, using the World-Ending True Flame to refine the demon's leftover Essence Blood can obtain pure Essence of Demon Power. The Eternal Hell Seal hardly needs transformation and can be directly absorbed.

In this way, the Eternal Hell Seal can quickly accumulate power. The powerful Eternal Hell Seal, in turn, can enhance the might of the Great Mighty Celestial Dragon Seal and boost the power of the Eternal Celestial Dragon Claw.

At this point, it entered a virtuous cycle. The more demons killed, the stronger the Eternal Celestial Dragon Claw becomes. The stronger the Claw, the more demons can be killed.

Gao Xuan spent ten days cleaning out the demons on the seventy-eighth layer.

The seventy-ninth and eightieth layers took Gao Xuan nearly a hundred days.

Over a hundred days of slaughter forcibly elevated the power of the Eternal Celestial Dragon Claw to an enormous grade.

As Gao Xuan sees it, the upgraded Eternal Celestial Dragon Claw is infinitely close to an Earth Artifact.

At this stage, merely absorbing Demon Qi is no longer useful. No matter how much quantity is accumulated, it cannot fundamentally enhance the Eternal Celestial Dragon Claw.

Gao Xuan used the Formless Nine Revolutions Inference and concluded that he must enhance the Eternal Hell Seal, the Great Mighty Celestial Dragon Seal, and also improve the Claw itself.

Because the Eternal Celestial Dragon Claw is forged from the Geng Metal Claw and the Netherworld King's Saber, its material can only bear so much power.

To continue upgrading, it is essential to start with the material of the Claw itself. In other words, upgrade the hardware first, then the software, to enter a higher tier.

The Five Elements Celestial Net Divine Light also faces this issue. The difference is, its hardware is sufficient, but Gao Xuan has not found a truly compatible Magic; the software falls far short.

Gao Xuan was content with such huge gains in the lowest level of the Immortal Realm's Cyan Celestial. What else is there to be dissatisfied with?

After solving the Cave of Ten Thousand Demons, he has hundreds of years to research further.

Entering the eighty-first layer of the cave, Gao Xuan immediately saw a deep fissure at the center.

Thick black and red Demon Qi rolls out from the fissure, forming a smoking column thousands of zhang thick.

The black-red smoke column resembles a sun, illuminating the eighty-first layer underground in black-red hues.

This black so dark it turns red is actually the densest Demon Qi transformed.

Ordinary people who even glance at such black-red light would have their Divine Soul corroded to ashes by the Filthy Qi.

Even someone as capable as Gao Xuan feels a burning sting on his skin. Here, the intensity of the Demon Qi is more terrible than a steel furnace.

The eighty-first layer of the cave is unusually vast, the dome alone is tens of thousands of zhang high. The extremely intense Demon Qi has refined the cave's rock and soil into black-red, looking like some kind of metal.

In fact, the soil here is ten times harder than steel. The extremely intense Demon Qi has changed the substance here on a Law level.

Most anomalously, there are no demons here—correctly, only one demon.

A huge black-red ape lies beneath the black-red smoke column. At least in body shape, it resembles an ape. Except that it has three heads and six arms.

The ape lazily lies there, with two heads asleep but one head glaring with black-red eyes in a daze.

The ape's body is hundreds of zhang tall, lying there like a mountain. To it, Gao Xuan seems too small, so small, he's like an ant.

However, the Clear Spirit Qi on Gao Xuan is too glaring. Especially in this dense material-like Demon Qi, his Clear Spirit Qi is like the sun in the dark night.

The dazed ape quickly noticed Gao Xuan, its black-red eyes showing clear contemplation.

Gao Xuan, seeing such a highly intelligent demon for the first time, uses Divine Sense to ask, "Who are you?"

"Who am I?"

The giant ape hesitated for a moment before saying, "I am the master here, the Master of Ten Thousand Demons, my name is Six-armed Demon Ape!"

The opponent's speech was surprisingly coherent and even able to articulate its name. It's truly intelligent. It's unclear if it's born this way or has absorbed a cultivator's Divine Soul memory to become like this.

"Is there only you here?" Gao Xuan asked.

Six-armed Demon Ape snorted, "Low-level demons don't deserve to stay with me."

It then showed anger, "What are you, running here for what?"

Gao Xuan doesn't know why the opponent's angry, but the posture of the enraged Demon Ape made him feel pressure on his Divine Soul.

The eighty-first layer of the cave shook violently due to the Demon Ape's anger, countless black-red lights flashed chaotically, it's as if an earthquake were about to occur.

The Six-armed Demon Ape's Divine Soul Power is so strong, it has exceeded the Cyan Celestial Realm's upper limit. Perhaps it's due to the special environment of the Cave of Ten Thousand Demons that allowed it to grow to this extent.

Gao Xuan softly says, "Why are you angry?"

"Demon and Dao are irreconcilable!"

After saying this, even the Six-armed Demon Ape was a bit perplexed. But it doesn't like to think too much, because of the anger, the other two heads opened their eyes.

The Six-armed Demon Ape suddenly roared loudly with all three heads, its voice quickly grew beyond what ears can capture.

The Five Elements Celestial Net Divine Light on Gao Xuan's body spontaneously oscillated slightly, completely shielding the massive sound waves outside.

Instantly, the Six-armed Demon Ape's roar exploded to the extreme. The gauze robe formed by the Five Elements Celestial Net Divine Light also vibrated intensely, as if suddenly facing a Level 12 gale head-on.

In Gao Xuan's Celestial Dragon Eye, the spatial Demon Qi was resonating at a terrifyingly high frequency, and the entire space was rapidly vibrating. If not for the unusual solidity of the eighty-first layer, the entire space would have exploded.

The Six-armed Demon Ape wasn't finished, it swung its gigantic fist, smashing at Gao Xuan. Six fists fell simultaneously from all directions, completely blocking Gao Xuan's escape routes.

The key is, the Demon Ape's Power is too strong, and its speed too fast. A single punch would turn Celestial Fool into a pulp; no Magic would work.

However, the Celestial Fool couldn't even withstand the Demon Ape's roar; there's no need for it to punch.

Gao Xuan was a bit surprised; the Demon Ape is terrifyingly strong. All the masters he encountered in the Cyan Celestial Realm combined aren't as formidable as a single hand of this Demon Ape.

But he's not one to be underestimated either.

Gao Xuan extended his left hand, and a Dark Gold Claw Blade formed a gigantic fist emerging from the Void, larger than the Demon Ape's combined six fists.

One punch against six fists; two forces of unmatched fierceness collided head-on, the Demon Ape's six gigantic fists simultaneously shattered, and the Six-armed Demon Ape staggered back a few steps, its three heads revealing a look of disbelief and doubt.

The Six-armed Demon Ape looked at its claws, and the six gigantic claws were already directly shattered, leaving only six half-arm stumps.

The Six-armed Demon Ape froze for a moment before emitting a painful scream; the black-red Demon Qi on its body flickered, and the shattered arms and fists quickly regenerated. It howled, charging at Gao Xuan, shouting, "Die die die die die die..."

(The last day of March, requesting monthly votes~ there's a second update, requesting monthly votes~

Also, quietly telling everyone a terrifying thing, 2021 has already passed a quarter of...