He could perceive that the surface of his body was covered by a layer of stone-like barrier, and as for the inside of his body, blood qi was also being massively consumed as the evil qi began to transform his body.
In just half an hour, a large amount of blood qi was consumed, and Zheng Yi's face became much paler.
"It's time!"
Feeling that the time was right, Zheng Yi directly took out a Zombie Crystal Core, whose bloodstains on the surface had long been cleaned.
Zheng Yi exerted force with two fingers, and with a click, a slight crack appeared on the surface of the crystal core.
A stream of pure energy flowed out from within, and Zheng Yi directly placed it into his mouth. The pure energy swiftly flowed through his throat and into his body.
Originally, as the blood qi was consumed massively, the heartbeat became weak. However, the pure energy from the crystal core, following the heartbeat, generated powerful blood qi that rapidly circulated throughout the body.
The complexion that had turned pale due to excessive loss of blood qi once again flushed with a hint of red, gradually turning into a rosy color.
"Indeed, this crystal core is the purest kind of Life Origin Energy, capable of continuously replenishing blood qi, more conveniently and efficiently than those elixir pills that replenish qi and blood."
"After all, medicine always has some poison; even those elixir pills that replenish qi and blood are no exception. Since they are artificially refined, they can't be perfect."
"But the Zombie Crystal Core contains pure life energy, though not in large quantities, it's without any elixir poison or impurities..."
"The most crucial point is that this kind of Zombie Crystal Core is virtually inexhaustible for me."
In an instant, Zheng Yi couldn't help but want to laugh out loud.
Previously, in the Doomsday World, the Zombie Crystal Cores dropped from killing large numbers of zombies surprisingly stored extremely pure energy, making them an excellent choice to replenish blood qi.
Those elixir pills that replenish blood qi are good, but they are nonetheless pills, containing some level of elixir poison.
Usually, one might not see the harm of elixir poison, but if neglected, it may subtly erode one's body.
If faced with perilous situations or encountering a bottleneck, the trouble with elixir poison may erupt, potentially causing irreparable losses.
These Zombie Crystal Cores contain extremely pure life energy, perfect for replenishing Life Essence Qi, as they are taken from heaven and earth, not carrying any elixir poison.
Having found suitable cultivation resources, Zheng Yi took a Grain Avoidance Pill into his mouth and went directly into closed-door training for cultivation.
Inside the Cultivation Room, the Cyan Profound Evil Qi stored in the Soul-Catching Banner, refined from resentful ghosts and produced by the Black Evil Technique, was continuously released.
As the Black Evil Technique circulated, the evil qi became sticky, gradually transforming from a light cyan into a deep cyan.
Seemingly ethereal and elusive like air, the evil qi started to faintly produce a "splashing" sound reminiscent of flowing water.
The solidifying air within began to be filled with dark cyan flames, clinging to the cyan fog, as the flames burned.
This cyan evil qi was far more effective than ordinary ghostly yin fiend, adhering to the surface of Zheng Yi's body and merging into it alongside the operation of the cultivation technique.
This cyan evil qi covered his body from top to bottom, resembling a suit of cyan armor enveloping his body.
Meanwhile, Zheng Yi eagerly took out handfuls of Zombie Crystal Cores and threw them into his mouth, absorbing the pure life energy contained within to replenish the continuously depleting blood qi.
One must say, ever since the opening of the Doomsday World, Zheng Yi felt as if his luck had turned for the better.
The various restrictive conditions needed for this training in the Profound Evil Body Forging Technique, although extremely difficult for others, were readily available for Zheng Yi, prepared in advance.
Whether it was the Cyan Profound Evil Qi produced by refining resentful ghosts with the Black Evil Technique or the Zombie Crystal Cores for life energy replenishment, they were previously unthinkable prospects.
...
During his time at the Soul Catching Sect, Zheng Yi diligently cultivated every day, hiding in his room or going to the Cultivation Room for training.
Every time he cultivated, he was extremely cautious, not only fully activating the defense array but also deploying his Lifebound Spiritual Artifact, the Soul-Catching Banner, to shroud the entire room in yin evil qi from within the banner.
Only under such cover could Zheng Yi barely feel at ease.
During this period, he mainly practiced this newly acquired Physical Body Tempering Method, the Profound Evil Body Forging Technique.
As for the subsequent techniques of the Black Evil Technique, Zheng Yi had already become proficient in the route of the technique, but he had not truly started to cultivate.
The Soul Catching Sect is located on a second-level spiritual vein, providing certain advantages for cultivating techniques.
Therefore, many sect disciples prefer to remain in the sect, relying on the strong spiritual qi released from the sect's spiritual veins for cultivation, which is much faster than cultivating elsewhere.
However, compared to other techniques that can improve with spiritual power absorption, the foundation of the Black Evil Technique is quite peculiar. Although it requires spiritual absorption and exhalation, the foundation of this technique lies entirely in refining various resentful souls and fierce ghosts.
It can be said that the more resentful souls and fierce ghosts Zheng Yi refines, the faster his evil qi upgrades, advancing from the most basic Black Evil Qi to the Profound Yin Fiend, and further to the Cyan Profound Fiend.
Progressing all the way, eventually transforming the attributes of the cultivation technique into the legendary Nine Netherworld Soul Slaughter Fiend.
By then, the power of this technique would be unfathomably elevated.
As long as there are sufficient resentful ghosts and fierce spirits as cultivation materials, Zheng Yi can cultivate the Black Evil Technique several times faster than other techniques.
This is also an essential reason why Zheng Yi could promptly restore his realm and even break through to the Middle Stage of Qi Cultivation.
Since the establishment of the Soul Catching Sect, over three to four hundred years have passed, with generations of inheritance within the sect. Naturally, the methods mastered within the sect are beyond what a new Inner Sect Disciple like Zheng Yi could know.
Hence, he dared not open the Doomsday World lightly, for fear of being discovered by sect experts.
After all, there is still a Foundation Establishment Cultivator guarding the sect.
In this world of soaring immortals and demons with opposing righteous and demonic cultivation, Zheng Yi dares not show any distinct behavior, for fear that sect leaders would notice his unusual display, leaving Zheng Yi with no place for burial.
Thus, whether it's practicing the subsequent techniques of the Black Evil Technique or further refining and upgrading his Lifebound Spiritual Artifact, the Soul-Catching Banner, unless Zheng Yi finds a way to conceal it, he won't easily display it within the sect.
To avoid being exposed to those with ulterior motives, which would be troublesome then.
The path of cultivation is inherently about contending with heaven, battling with people, seeking fortune, seizing treasures, enhancing oneself, and pursuing higher realms.
Therefore, in the sect, it is wise to remain cautious and disciplined.