Li Feiyu had an incredibly easy journey; whenever he encountered a Yin Soul, the Soul Devouring Yin Plate would proactively attack.
Yin Souls from the Qi Refining stage up to the Early Stage Core Formation could not escape its Yin deep Lock Soul Chain.
However, when a Yin Soul reached the Core Formation stage stage, its strength was not weak. If Li Feiyu hadn't recently melted the Myriad Year Soul Devouring Tree and soul devouring stone into it, greatly enhancing its ability to devour Yin Souls, it probably wouldn't possess such power.
But for Yin Souls at the Middle Stage Core Formation and above, Li Feiyu had to assist. Li Feiyu and Crimson Crow would use their True Yang Flames to weaken the Core Formation Yin Soul's strength, then pull it into the Yin Soul World within the artifact.
Even at the late stage Core Formation, they had no fear, only needing a bit more flame and a few drops of longevity liquid to burn.
For others, even an Early Stage Core Formation Yin Soul was a formidable opponent, and this included Scarlet Fire Old Freak, who was at the late stage Core Formation.
Yin Souls with Core Formation stage stage strength had essentially entered the path of Ghost Cultivation, possessing Divine Abilities and capable of manipulating large numbers of Yin Souls to attack. While they might be ordinary in the outside world, they were quite terrifying here.
Several individuals who carelessly encountered late stage Core Formation Ghost Cultivators were directly annihilated, their Primordial Spirits also devoured.
Then, even their Physical Bodies were occupied, becoming their Physical Body Puppets.
As Li Feiyu walked, he saw a person ahead, an Elder from the Ten Thousand Dharma Gate at the Middle Stage Core Formation stage, with multiple injuries on his body, looking quite strange.
"It seems these thirty-three passages, after entering the stone sect, are interconnected," Li Feiyu murmured to himself, cautiously staring at the Ten Thousand Dharma Gate Elder. But as he drew slightly closer, the Elder suddenly erupted, charging towards Li Feiyu.
"You want to kill me? Good, I still feel my harvest isn't enough."
A cold smile appeared on Li Feiyu's lips as he unleashed a True Yang Dharma Seal. He originally intended to test the waters, but to his surprise, it directly sent the Ten Thousand Dharma Gate Elder flying.
Li Feiyu was instantly dumbfounded. To withstand his True Yang Dharma Seal with a Physical Body—was he crazy?
Or was it that besides being proficient in Spells and Divine Abilities, he was also skilled in Physical Body strength?
The Ten Thousand Dharma Gate Elder, who had been knocked back, moved a few times, and with a series of clicks and clacks, his joints cracked as he sat up like a corpse.
Li Feiyu immediately understood—it was a Puppet!
The Soul Devouring Yin Plate emitted a burst of dark light, and the Yin deep Lock Soul Chain emerged from the void, making a clattering sound as it shot towards the Ten Thousand Dharma Gate Elder.
Under the control of the Yin Soul within his body, the Ten Thousand Dharma Gate Elder continuously dodged, but ultimately could not escape the dozen or so pitch-black chains.
The chains drilled into his body, and then a Core Formation Ghost Cultivator, emitting Yin Qi all over, emerged.
The Ghost Cultivator was pulled away from the Physical Body, greatly astonished, then stared fixedly at Li Feiyu and the Soul Devouring Yin Plate.
He let out a sharp, prolonged shriek, like both human and beast, and Li Feiyu immediately felt dizzy.
After that, his entire body's Yin Qi surged, and he directly broke free from the Lock Soul Chain's bondage.
Li Feiyu steadied his mind and calmly said, "Another late stage Core Formation Ghost Cultivator. It seems this place is truly dangerous. I wonder how Xing Jueyi is doing?"
He patted Crimson Crow, "Attack!"
Crimson Crow flew towards the late stage Core Formation Ghost Cultivator, then opened its mouth and spat out a pale golden flame. Facing a Ghost Cultivator of this level, even the crimson golden flame was still a bit lacking.
Li Feiyu hadn't learned the True Yang Flame, so he couldn't help. He could only provide a drop of longevity liquid to make the Soul Devouring Yin Plate erupt and burn, while also mobilizing his magic power to activate the Ten Thousand Ghosts Devouring Souls.
Seeing a large number of Yin Souls, accompanied by rolling Yin Qi, coming towards him, the late stage Core Formation Ghost Cultivator was greatly surprised. He wanted to control those Yin Souls with a secret technique.
But he failed.
These Yin Souls only possessed fierce instincts and no consciousness of their own; they were Yin Soul Puppets completely controlled by the Soul Devouring Yin Plate.
Within the Yin Qi, another dozen or so Lock Soul Chains burst forth. Under the burning eruption of the longevity liquid, their power became even stronger.
In front were Yin Souls and chains, and behind was the terrifying pale golden True Yang Fire.
The late stage Core Formation Ghost Cultivator unleashed a burst of Extreme Yin Qi, attempting to extinguish the pale golden flames, but Crimson Crow would not let him succeed so easily. The two were temporarily in a stalemate.
The torrent of Yin Souls arrived in the blink of an eye. One by one, they pounced on the late stage Core Formation Ghost Cultivator like wild beasts, biting at his soul body.
Then, even stronger Lock Soul Chains bound his body. He tried to break free again, but did not succeed.
The pale golden flames landed on him, and he immediately let out a tragic wail.
At this moment, Li Feiyu threw in two more drops of longevity liquid.
Clatter, clatter~
The chains contracted, and the late stage Core Formation Ghost Cultivator was continuously pulled towards the Soul Devouring Yin Plate.
He knew that once he was pulled into it, he would probably never be able to turn over, but on one side, Crimson Crow was weakening him, and on the other, Li Feiyu was continuously increasing the power of the Soul Devouring Yin Plate.
A few breaths later, this Core Formation Ghost Cultivator was pulled into the plate's world, and it was estimated that he would soon be refined into a late stage Core Formation Yin Soul Puppet.
Li Feiyu collected the Storage Pouch of the Ten Thousand Dharma Gate Elder, put his corpse into the lihuo cauldron, and continued deeper into this underground world.
Finally, Li Feiyu arrived at a Soul Suppressing Altar.
The altar was divided into four layers, six zhang high, and pyramid-shaped, but there was a significant gap in its southeast corner.
A gray-robed corpse sat cross-legged above the altar. After an unknown number of years, he had long since turned into white bones.
Li Feiyu originally intended to go up to the altar to examine the Storage Pouch beside the white bones.
But just then, the white bones began to glow, and then an Immortal Master-like old man with a long beard and white hair, standing with his hands behind his back, appeared above.
Li Feiyu's pupils constricted slightly, "Who is Senior? Are you Immortal Master Taiyin?"
"It is this Immortal Master!"
"But you..."
"I possess soul-nourishing items, hence I can persist to this day."
"Are you here for my Legacy?"
Li Feiyu nodded, "Is the Ghost King mentioned before the stone sect beneath this altar?"
"That's right, but don't worry, with this Immortal Master here, he won't escape for a while. However, this altar is ultimately broken in one corner, and you need to find two items for me. Then I can repair the altar, and I can give you what you want."
The Soul Devouring Yin Plate trembled for a while. Li Feiyu patted it to calm it down.
"What does Immortal Master want me to find?"
"A supreme earth yin stone and a soul startling iron."
The Myriad Year Soul Devouring Tree, also known as the supreme earth yin stone.
Li Feiyu's eyes lit up, and he said calmly, "Where can I find them?"
Immortal Master Taiyin gave Li Feiyu an Evil Ghost Token, "Mobilize your magic power and follow its guidance. It can lead you to the Ghost King's lair. He once collected these two items."
Li Feiyu held the Evil Ghost Token. The token was extremely cold. After injecting magic power, it indeed shot out a gray light ray, as if guiding the direction.
"Immortal Master, one last question, why don't you go yourself?"
Immortal Master Taiyin sighed slightly, "If I leave, who will suppress this altar?"
"How about I give it a try?" Li Feiyu probed.
Immortal Master Taiyin was momentarily stunned, staring at Li Feiyu for a while.
Li Feiyu laughed heartily, "Just kidding. If I had the Immortal Master's abilities, I wouldn't need to come here to take risks."
"Immortal Master, I'll go now."
"Be careful of the wandering Yin Souls and Ghost Cultivators outside. Go quickly and return quickly."
Li Feiyu nodded and left the altar space.
Not long after he left, Li Feiyu's expression immediately became serious. If he guessed correctly, the so-called Immortal Master Taiyin should be the Ghost King.
To manifest so realistically, his Primordial Spirit power must be at least above the Nascent Soul stage.
He wanted these two things, probably to refine some Magic Treasure to destroy the altar.
And the reason he didn't go out was that there was a very powerful Restriction in this altar space, firmly trapping him.
"The supreme earth yin stone is exactly what I need, and soul startling iron is also a very rare Material. The Magic Treasure refined from it can probably directly harm the Primordial Spirit."
"Just these two items alone can probably refine a good Primordial Spirit attacking Magic Treasure."
Li Feiyu quickly advanced according to the Evil Ghost Token's guidance.
Among other forces, the Star Commerce Alliance lost two Dharma Protector Elders, Star Water Sky and Xing Jueyi. The Tianyu Commerce Alliance was left with only one Middle Stage Core Formation Elder, whose Primordial Spirit was injured, and they had all chosen to withdraw.
As for the Ten Thousand Dharma Gate, Ten Thousand Swords Sect, and Three Immortal sect, they were completely wiped out.
Only Wu Chou and Scarlet Fire Old Freak remained, traveling together and also reaching the depths of this underground world.