To better refine the Resentful Ghosts, Zheng Yi had no choice but to create his own Soul-Catching Banner, allowing it to upgrade to a higher level Soul-Catching Banner.
After all, this Magical Artifact has already become his Lifebound Spiritual Artifact.
It's critical to his future path in cultivation, and not a single mistake can be tolerated.
After much deliberation, Zheng Yi finally chose the "Profound Evil Body Forging Technique" from among the many cultivation techniques.
Just from the name, one can clearly understand the core of this body refining technique.
It's Evil Qi!
This "Profound Evil Body Forging Technique" requires an ample amount of Evil Qi to temper the body. Once refined to a profound level, it can achieve the stage of Iron Bone Silver Flesh, greatly enhancing one's defensive capabilities.
Moreover, the higher the level of Evil Qi refined by this "Profound Evil Body Forging Technique," the faster the training speed, making it an extremely suitable cultivation technique for Zheng Yi.
One must know, the "Black Evil Technique" cultivated by Zheng Yi can inherently produce Evil Qi. Due to a large-scale refinement of Resentful Ghosts, it has now transformed into Cyan Profound Fiend.
Additionally, as time passes and his realm improves, with further refinement of more powerful Resentful Ghosts, he could eventually reach the legendary level of Nine Netherworld Soul Slaughter Fiend.
According to the sect's records, when Black Evil reaches the Nine Netherworld Soul Slaughter Fiend level, the Evil Qi can even pollute Golden Core Stage cultivators.
Not only is its power formidable, but it can also erode the protective Magical Power of a Golden Core True Man, greatly diminishing their strength, reducing the power of their magic spells, granting an undeniable advantage in confrontations.
Furthermore, this "Profound Evil Body Forging Technique" not only requires Evil Qi to temper the body but also demands a substantial amount of Blood Qi to supplement oneself, preventing the rate of Evil Qi erosion from surpassing the quantity of Blood Qi within the body.
Otherwise, the final consequence would be the body being refined into a dried corpse.
This body refining technique is considered quite difficult in the first level of the Dharma Transmission Hall and ranks among the outstanding ones in Qi Refining Stage body refining techniques.
In fact, in the Great Yi City Immortal Realm, there is a wide variety of elixirs to supplement Blood Qi, such as Blood Qi Pills, Blood Replenishing Pills, Blood Enhancement Pills...
All these elixirs are incredibly popular types of elixir pills.
Regardless of whether they are Demon Dao Cultivators or Righteous Dao Cultivators, they both need to supplement Blood Qi.
Blood Qi is the foundation supporting the body's cultivation; without sufficient Blood Qi, maintaining one's realm would be difficult.
Only by continuously refining blood-replenishing elixirs can one maintain vigorous bodily functions to support cultivation.
Besides Blood Qi, a more troublesome issue is finding Evil Qi.
The naturally occurring Evil Qi sites are exceedingly rare treasures. Once discovered, they are swiftly claimed by major forces or sects, with ordinary individuals having no access to them.
Take the Soul Catching Sect, for example, if they occupy an Evil Qi treasure land, the priority is to ensure the cultivation of the sect's higher-ups, even though Zheng Yi is an Inner Sect Disciple, he is not qualified to enter the Evil Qi treasure land.
It's important to know that Evil Qi is an energy needed for Foundation Establishment in impacting the Purple Mansion Realm. Only after fully supplementing Evil Qi, enabling energy reincarnation, Yin and Yang harmonization, and Five Elements Reincarnation, can one finally establish the Purple Mansion.
As the saying goes, where there is Yin, there is Yang; Extreme Yin gives rise to Yang, Extreme Yang transforms into Yin, Yin and Yang mutually complement, and only then can they journey together, embodying natural Dao.
As a small sect in the Demon Realm, Soul Catching Sect has several Foundation Establishment Stage cultivators, with the strongest within the sect being a Late Stage Foundation Establishment Supreme Elder, precisely lacking the Heaven and Earth Evil Qi treasure land.
The Purple Mansion Realm establishment requires concentrated Evil Qi treasure lands, not accessible to ordinary Inner Sect Disciples, at least a Foundation Establishment Stage cultivator could use them.
Within Soul Catching Sect, there are only three Foundation Establishment Cultivators; besides the sect's Supreme Elder, there is one who is the Sect Leader, and another is the Great Elder managing internal affairs.
According to Zheng Yi's understanding, the entire sect, including sect disciples and upper echelons, totals over three thousand, but only three are in the Foundation Establishment Stage, indicating it is not a stage easily attainable by ordinary cultivators.
In the past Profound Void City, Qi Cultivation Stage individuals were all Loose Cultivators.
While those in Foundation Establishment Stage were already considered major cultivators.
Such Foundation Establishment Cultivators could preside over a city or manage a market.
Or retire and become an elder or consecrated individual in any small sect, or even establish a hundred-year cultivation clan if they have blood descendants.
The reason is simple because only Foundation Establishment Cultivators of this level can deter other forces of Loose Cultivators that resemble wolves.
Ensuring the safety within their sphere of influence.
Regarding Evil Qi, Zheng Yi's cultivation of the "Black Evil Technique" provides a perfect solution.
As for the blood supplementation, he thought of another substance that might serve as a substitute.
After registering for these three techniques, Zheng Yi activated his wisdom, working hard to imprint every single word into his mind.
These cultivation classics and secret techniques are only permitted to be learned in the Dharma Transmission Hall; they are strictly prohibited from being taken out or copied to protect sect heritage from being leaked.
Luckily, cultivators undergo bodily transformation, brain realm development, their Divine Souls possess extraordinary memory; it's said they are all equipped with the ability to remember everything at first glance.
A single line of genuine teaching is worth more than ten thousand voluminous books.
Spending three to five hours is enough to firmly embed these contents into the heart.
While watched by the guarding disciple, Zheng Yi swore a Celestial Dao Oath, never to share the techniques learned without the sect's command during his lifetime, then left the Dharma Transmission Hall directly.
Heading to the sect's Internal Affairs Hall to claim an Inner Sect Disciple's cultivation room, Zheng Yi couldn't wait to verify his conjectures.
These rooms are built on the sect's Tier Two Spirit Vein, emanating a thick air of Spiritual Qi.
Moreover, they can activate Defense Arrays, ensuring that any internal fluctuations do not reach the outside nor are influenced by external disturbances, providing a much better cultivation environment than Zheng Yi had previously in Profound Void City.
Despite this, still somewhat uncertain, Zheng Yi then released his Lifebound Spiritual Artifact, the Soul-Catching Banner, forming a vast black mist that enshrouded the entire room, blocking out any Divine Thoughts from probing in.
After thoroughly reviewing the "Profound Evil Body Forging Technique," he began operating according to the techniques recorded within.
Zheng Yi picked up the Soul-Catching Banner, gently shaking it, releasing a wave of Evil Qi, filling the room.
As the cultivation system of "Profound Evil Body Forging Technique" operated within his meridians, Zheng Yi distinctly felt the Evil Qi dispersed in the air being attracted by his body, starting to attach to the surface.
Instantly, a layer of gray matter covered the skin.
Although clearly visible to the naked eye, determining whether it is a tangible substance remains elusive.
The technique continued to operate, rapidly drawing the Evil Qi within the room into Zheng Yi's body.