Since accepting this task, Zhou Yan left Tianxing City, flying northward by sword, with the destination being the land of the Heavenly Demon and Void Spirit.

To reach such a place, without a space node, it's not possible to traverse the void, and Tianxing City and the city that can be transferred from Tianxing City are both far from the Void Spirit and Heavenly Demon land, so using teleportation to cover the distance is not as direct as flying by sword.

"Outer Heaven Demon, Void Spirit land."

Zhou Yan murmured to himself, a contemplative look in his eyes.

In the Treasure Pavilion of the Purgatory Refiner's branch, Zhou Yan checked the relevant information about the Heavenly Demon and Void Spirit, thus gaining a deeper understanding of these things.

The Heavenly Demon, above the Yin Spirit, is a Yin Spirit with self-will, capable of analysis and thought, having developed crystal bones.

This type of Yin Spirit is a Heavenly Demon.

The Void Spirit, however, is a non-corporeal Soul Body, Evil Soul, or Evil Soul of various types. Such as Fire Soul, Yin Soul, etc.

This is the Void Spirit.

A corporeal Void Spirit is a Yin Spirit or Fire Spirit, Water Spirit, and other Spiritual Body.

A non-corporeal spirit is a Void Spirit.

The classification here is extremely detailed.

It was after accepting this task that Zhou Yan gained the corresponding qualification to delve deeper into these materials. Furthermore, taking on this task requires terrifying talent or a guarantor of Elder Level within the branch church, otherwise, such tasks are not easily accepted.

Under the guarantee of Zhu Ge Tianchen, coupled with Zhou Yan's own renown in the Dark God Domain due to his insight into the Heavenly Sword Immortal Pool, taking on this task was naturally no problem.

"Heavenly Demon, their research on Tai Chu Rune has allowed them to form Tai Chu Rune into a singular whole rune. Some rune combinations, once formed, can provide an enhancement known as 'Word Spirit'.

This 'Word Spirit' is the top auxiliary method in the refinement of Outer Heaven Demons, capable of increasing combat power by thirty to fifty percent or more, immensely formidable."

"If a set of 'Word Spirit' combination enhancements is formed, it can elevate a cultivator's combat power by a whole level."

"It's just that I don't know what kind of combination or engraving method the 'Word Spirit' is. There is no related memory in my brother's recollections, and Xuan Yuan Ancestor never mentioned this.

Zhou Yan pondered. Along the way, he frequently recalled the materials he had seen, finding 'Word Spirit' the hardest to comprehend.

"Heavenly Demons bestow blessings and grow strength upon their weapons with a Power of Vast Vow, granting blessings with sincere words, which is 'Word Spirit'.

This was information from the data in the Purgatory Palace of the Dark God Domain, which Zhou Yan could view only after accepting the task to retrieve materials.

Yet, he found some of the annotations difficult to understand—Can Heavenly Demons make wishes? Speak words that cause the enhancement of weapons' combat power? Is 'Word Spirit' an advancement from Tai Chu Rune?

These things, to Zhou Yan, seemed as bizarre as being told that many Sword Dao experts had trained their Sword Dao into Sword Dao. Yet, they proudly claimed this as an advanced swordsmanship of Sword Dao.

However, no matter how bizarre, this was reality.

The 'Word Spirit' was indeed more powerful than Tai Chu Rune, a combined entity of advanced Tai Chu Rune. Even if unwilling to admit it, one had to acknowledge this fact.

Zhou Yan attempted to combine some Tai Chu Runes himself, but he was utterly unable to create the so-called 'Word Spirit', which more resembled an array constructed from rune combinations.

All the way, he continually flew while pondering this.

Along the way, no further dangers arose. From the previous battle, some cultivators discerned that Divine Spirit Nine Transitions were far from being Zhou Yan's adversary, and dispatching a Venerable would inevitably incur the wrath of the Sumeru Immortal Mountain, so such targeting disappeared.

Zhou Yan traveled continuously, with the powerful spatial ability of the Void Sword Body occasionally traversing the void. In just half a day, Zhou Yan arrived at the Dark God Domain's Heavenly Demon Wilderness.

The Heavenly Demon Void Spirit Wilderness was a desolate land, similar to the environment of the Outer Heaven Demon Battlefield.

This was a region of endless yellow sand, perpetually devoid of sunlight, an eternally dim and hazy world, as if shrouded in a layer of frost.

"Proceeding through the Heavenly Demon Wilderness should lead to the Heavenly Demon Void Spirit Domain, where the number of Heavenly Demons and Void Spirits will gradually increase. But why is the sensing energy of the Xuanyuan Sword changing? What's going on? Could it be on the cultivators or the Heavenly Demons?"

Zhou Yan carefully sensed the changes in the Xuanyuan Sword, suddenly discovering that the previously motionless Xuanyuan Sword Fragment appeared to move, showing a distinct change in position.

Zhou Yan locked onto the direction of the Xuanyuan Sword Fragment, pressing forward, stepping into the domain of Heavenly Demons and Void Spirits.

This region belonged to the more peripheral area of the Dark God Domain. Even though it took Zhou Yan only half a day from Tianxing City to reach here, it was not because the Dark God Domain was small, but because, after locking onto the direction of the Xuanyuan Sword's energy, Zhou Yan traversed the endless distance innumerable times with space nodes to reach this place.

After all, Zhou Yan understood spatial knowledge and had a vague sensing of the Xuanyuan Sword Fragment's position. Once the northern direction was locked, crossing the void wasn't that difficult.

Zhou Yan entered the Heavenly Demon Domain and immediately sensed the presence of a large number of Primordial Yin Spirits.

With a thought, Zhou Yan transformed into a Primordial Yin Spirit with crystal-like bones, which was already equivalent to a Heavenly Demon.

In this form, moving through the Tai Chu Yin Qi-infused environment was delightfully smooth for Zhou Yan, without any sense of hindrance.

Along the way, Zhou Yan encountered Primordial Yin Spirits, Heavenly Demons, and corresponding Void Spirits, which often appeared in groups. Without the Primordial Yin Spirit form, dealing with them would have been troublesome for Zhou Yan.

However, as a Primordial Yin Spirit, Zhou Yan easily traversed through these Primordial Yin Spirits, Heavenly Demons, and Void Spirits.

Throughout his journey, Zhou Yan, combining observations from the Dark God Domain, deepened his understanding of everything, and fully comprehended the relationships between Void Spirits, Yin Spirits, and Heavenly Demons.

Thus, Zhou Yan took action and began to slay the Heavenly Demons and Void Spirits among the Primordial Yin Spirits during his travels.

The Heavenly Demons are the rulers among the Primordial Yin Spirits, leading like the Blood River's Primordial Yin Spirits, while the Void Spirits are illusory and unreal but have a terrifying aura that chills one's divine soul.

However, Zhou Yan's sensing power was extremely strong, so even these nearly transparent, non-existent entities could still be detected by him, making them even easier to slay.

Zhou Yan swiftly slew Void Spirits and Heavenly Demons as a Primordial Yin Spirit, often embedding the ultimate secrets of the Ten Thousand Soul Sword Dao, ensuring a clean kill with a single strike.

As he journeyed, Zhou Yan slaughtered countless Heavenly Demons and Void Spirits. For other cultivators, these tasks posed immense challenges, but for him, with only careful vigilance, they weren't major issues.

Nonetheless, Zhou Yan primarily wasn't focused on this task. Instead, he continued deeper into the Heavenly Demon Domain while completing it.

The aura of the Xuanyuan Sword Fragment fluctuated between weak and strong, showing evident oscillations.

Unknowingly, as Zhou Yan followed it, the Heavenly Demons he encountered had reached the Venerate Realm, as had the Void Spirits.

At this realm, it was difficult to act without alarming other Heavenly Demons and Void Spirits; every step had to be taken cautiously, or else being discovered would lead to immediate siege.

Upon reflection, Zhou Yan abandoned further slaying of the Heavenly Demons and Yin Spirits and instead pursued the aura deeper.

The deeper he went, the greater the danger grew; fearsome Heavenly Demons appeared often, and the domain echoed with the howls of Yin Spirits and Heavenly Demons, resembling hell.

The aura here was also more somber, the Void Spirits terrifyingly strong like ultimate evil souls, capable of easily penetrating minds, sending one into madness like a demon.

Zhou Yan, concentrating and holding his breath, felt a bit solemn and under pressure.

Yet the fluctuation in the Xuanyuan Sword Fragment's aura had become obvious, as Zhou Yan discovered he had arrived at the domain's center—the location of the Holy Spirit Barrier.

The Holy Spirit Barrier is a powerful domain sealed by strong Void Spirits and Heavenly Demons to prevent excess slaughter of demons. It is the Primordial Yin Spirits' stronghold, housing various spiritual bodies like Evil Spirits, Resentful Spirits, and Wraiths from the Dark God Domain.

This equates to a part of the land occupied by spiritual bodies in the Dark God Domain, where they have settled and fortified.

Before the Holy Spirit Barrier, Zhou Yan hesitated slightly, but then the Xuanyuan Sword Fragment shook violently, clearly very close.

After gritting his teeth, Zhou Yan passed through the Holy Spirit Barrier in his Heavenly Demon form, entering the world within.

Upon entry, a chilling cold seeped into Zhou Yan's body and mind; even in his Heavenly Demon form, he felt an intense cold.

At that moment, Zhou Yan noticed that all Void Spirits around were already dead, while strong energy waves still rippled through the void.

In the distant void, two cultivators' shadows were fiercely battling!

Outside the barrier, Zhou Yan couldn't see anything within, but upon entering, he realized the two cultivators were fighting almost right next to him!

And these combatants were two extremely powerful Venerables!

Zhou Yan, concentrating and holding his breath, calmly wandered like a heavenly demon, leaving without staying, as the Venerables' energy fluctuations could instantly kill even him, a 'Heavenly Demon.'

Zhou Yan exited this layer of the Holy Spirit Barrier in his Heavenly Demon form, though it was a facade.

In reality, upon exiting the barrier, Zhou Yan transformed into a chaos of Tai Chu Yin Qi energy, drifting within a space inside the barrier.

Observing the two Venerables' battle, Zhou Yan discovered that a cold-faced elder in a gray robe and brown hair wielded a dark golden longsword, constantly exuding powerful killing intents.

The Xuanyuan Sword Fragment's aura emanated from this sword.

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