The Forest of White Bones, a woodland composed of the bones of unknown gigantic beasts, with thick, ghastly white bones thrust into the ground, covering this area, as if it were a forest of bone trees.

Lu Yu sensed a familiar power here, the power of the Yin Underworld Cold Aura, as numerous residual souls of deceased beings gathered here.

The Forest of White Bones is a place similar to the Yinming Cold Pool, both having deathly auras so dense that they opened rifts to another world, allowing the Yin Underworld Cold Aura to seep through from that world.

Besides the Yin Underworld Cold Aura, Lu Yu also sensed the presence of Purple Flame Demon Fire, the fire seed of which in his body became active, seemingly excited at returning to its birthplace.

After Zhou Tong told Lu Yu the direction, he walked alone into the Forest of White Bones, in a direction exactly opposite to where the aura of Purple Flame Demon Fire was emanating from.

Lu Yu glanced at Zhou Tong's receding figure and walked toward the direction where the Purple Flame Demon Fire was located.

Feeling the cold air around him, Lu Yu slightly furrowed his brow; the concentration of the Yin Underworld Cold Aura here was too low to meet the necessary level for his body refinement, insufficient to exert enough pressure on his body.

The Yin Underworld Cold Aura in the Yinming Cold Pool is concentrated in the pool water; the concentration is very high and increases the deeper one goes, with the deepest part even able to touch the fundamental power of another world.

It is a power opposite to the Spiritual Qi that grants intelligence and life to all things; it strips away life from all things, returning everything to dead silence.

Even the ancestor of the Liang family, who was at the seventh level of the Qi Sea Realm, was almost deprived of life by such power.

Lu Yu was increasingly disappointed as he ventured deeper; the Forest of White Bones was vast, and though the amount of Yin Underworld Cold Aura exceeded that of the Yinming Cold Pool, the concentration was not high enough to exert pressure on him.

Ordinary Martial Cultivators below the sixth level of the Qi Control Realm might have their Qi Blood frozen upon entering this forest, while those above the seventh level of the Qi Control Realm cannot linger here long.

Somehow Zhou Tong was able to disregard the Yin Underworld Cold Aura here.

Rustling sounds issued softly; Lu Yu saw bone frames made of several bones approaching him. Observing the frames, he realized they operated purely on the Yin Underworld Cold Aura within the bones.

He delivered a punch, sending a spiritual power ball crashing out with immense force, smashing the bone frames. While colliding, Lu Yu even detonated that cluster of spiritual power from afar, causing the bone frames to explode and scatter like dandruff on the ground.

"Hmm?" Lu Yu noticed that among the shattered bones, there was a bone with a white jade color, resembling Lu Yu's Ice Crystal Jade Bone, although their cultivation directions were different.

This white jade-colored bone likely belonged to an attribute-less body refiner whose cultivation level reached the Iron Bone Realm.

Sweeping the white jade bone with spiritual power, Lu Yu found that it remained intact during his earlier attack and, in a sense, it could be considered a treasure.

Some Artifact Refiners favor using bones to craft spiritual weapons, spiritual treasures, or even White Bone Spirit Armor. These refiners especially enjoy collecting the bones of strong body refiners and mighty demon beasts.

Lu Yu's bones, in the hands of such an Artifact Refiner, might be used to forge a dual-attribute spiritual weapon or treasure of ice and fire.

Lu Yu was not familiar with such refiners; he picked up the bone simply to observe the paths taken by other body-refining Martial Cultivators, hoping for inspiration.

With the White Jade Spirit Bone in hand, Lu Yu immediately felt the rich Yin Underworld Cold Aura within, with his right hand holding the bone transmitting a chilling, piercing cold.

"This type of bone is very effective for body refinement," Lu Yu concluded, paying more attention to the surrounding bones while walking, in hopes of finding more White Jade Spirit Bones.

Using the mall's scanning feature on the White Jade Spirit Bone, Lu Yu found no such item available.

The White Jade Spirit Bone is a special product of specific conditions at a specific location, not a natural treasure born of the heavens and earth, so it's normal not to find it in the system store, leaving Lu Yu not too disappointed.

Throughout his journey, Lu Yu found only one White Jade Spirit Bone and sighed: a single White Jade Spirit Bone was far from enough!

If only there were a means to gather the Yin Underworld Cold Aura here, it would allow him to control the concentration at will.

Unfortunately, Lu Yu had tried and failed.

He attempted to compress the Yin Underworld Cold Aura in the air using spiritual power, but spiritual power merely passed through, for the quality of the Yin Underworld Cold Aura was higher than his current spiritual power, and he couldn't compress it.

The difference between them is like the gap in spiritual power quality between the Qi Control Realm and the Qi Sea Realm.

One is liquefied Spiritual Qi, the other is gaseous Spiritual Qi.

Although the spiritual power of the Qi Control Realm has undergone a qualitative change once, it's still far from being liquefied, which is why the Qi Sea Realm can overpower the Qi Control Realm.

Setting aside matters of the Yin Underworld Cold Aura, Lu Yu focused his mind on the birthplace of the Purple Flame Demon Fire before him.

Purplish-black flames burned atop a Bone Mountain, and Lu Yu could sense that the residual souls in the Forest of White Bones converged here to fuel the uninterrupted burning of the Purple Flame Demon Fire day and night.

The Purple Flame Demon Fire here was even more formidable; Lu Yu could sense its immense power atop Bone Mountain, feeling the heat standing at the mountain's edge.

The heat was from his soul, an intense heat felt by his soul, not his body.

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