Oni Aura is a branch of Demonic Qi.
There are many kinds of turbid energy between heaven and earth.
There is Beast Aura formed after beasts absorb it, cold and fierce; there is Wood Aura formed after plants absorb it, deep and heavy; and there is Weapon Aura formed after objects absorb it, sharp and condensed, carrying obsession.
And Oni Aura is a special existence produced after the resentment of the dead combines with Demonic Qi.
It possesses both the turbidity of Demonic Qi and the coldness of the undead, and it also carries the lingering obsessions and will of humans.
This kind of aura is rare among demons.
Because the resentment of most dead people is too weak to merge with Demonic Qi, and will only dissipate between heaven and earth.
Only those warriors who were highly skilled in martial arts during their lifetime and had deep obsessions after death have the possibility of becoming an Ghost Samurai.
And Hikaru's Oni Aura is even more special.
As mentioned before,
the transformations of ordinary demons, even those of Ghost Samurai, are all achieved by absorbing Demonic Qi from heaven and earth.
And the so-called Demonic Qi is essentially a mixture of the resentment of countless living beings, countless decaying auras, and countless filthy factors; it is the sinking side opposite to the spiritual energy generated by nature.
Even demons themselves cannot fully utilize such turbid energy freely.
It is like kneading dough with muddy water; the resulting dough will always contain impurities.
But Hikaru is different.
Every one of his transformations is completed by conquering weapons and integrating the weapons' abilities into himself.
Although those weapons were also tainted with Demonic Qi, after being transformed by the favorability system, they became much purer.
It is dough made with distilled water; clean, firm, and without impurities.
Therefore—
At this moment, when Hikaru exploded with full power, the Oni Aura surging from his body was actually denser than the Qualitative Transformation level Demonic Qi of the Kamaitachi.
Even more solid.
Even sharper.
For a moment.
Although his Demonic Qi and Oni Aura were far inferior in quantity to the Kamaitachi before him, he could even achieve the feat of breaking through the constraints and suppression of the Kamaitachi's wind!
"Awoo!"
The Kamaitachi let out a confused hiss.
It felt the oppression of that Oni Aura, a feeling it had never experienced before.
A lower-level demon could actually make it feel threatened?
Impossible.
Absolutely impossible.
In the Kamaitachi's hollow eye sockets, the airflow began to rotate faster.
It no longer tested him.
"Since that's the case—"
Its voice was like a howling gale.
"Then let me see where your limit is."
The Kamaitachi opened its mouth, and gray-white airflow spewed out from the depths of its throat.
It did not look like wind, but rather like blades condensed to the extreme.
It was countless wind blades as thin as hair, woven into an airtight net, covering Hikaru.
This was also the characteristic displayed by a high-level demon at the 'Qualitative Transformation' level.
It was the extreme compression of the quality of wind!
Wherever it passed, even hard rock would be cut into powder.
Hikaru's pupils contracted.
He could see those wind blades.
Through the blood mist scattered in the air by [Resonance with Blood], he could clearly see the trajectory of every wind blade.
But seeing them did not mean he could dodge them.
Those wind blades were too dense.
So dense that there were almost no gaps.
He raised his sword to block.
Oni Aura erupted, condensing into a black protective shield on the blade.
Clang, clang, clang, clang—the sound of metal clashing connected into one.
Those wind blades constantly struck the protective shield, and each strike made the shield thinner.
Hikaru kept retreating.
Blue bricks shattered, leaving two deep grooves.
But he still blocked it.
In the Kamaitachi's eye sockets, the airflow rotated faster.
"Interesting."
It said.
Then, its body began to change.
That three-zhang tall body was shrinking.
But Hikaru knew it wasn't really shrinking.
It was condensing, the core ability of a Qualitative Transformation demon—Density Manipulation.
Compressing the originally dispersed mass into a smaller volume.
The volume became smaller, but the weight did not change.
Only the speed would become faster, and the power would become stronger!
The attacks would be sharper.
This was the terrifying part of a Qualitative Transformation demon.
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