Three days later, Yin Ning, who had initially learned some of the methods of sacrificial refining weapons, began to use these methods to start refining the mysterious black crystal skeleton, but I don't know if these sacrificial methods were too low-level, or if this black crystal skeleton was too advanced, and these sacrificial methods had no effect on it.

Yin Ning, who was a little disgraced by this black crystal skeleton, also began to be impatient and lose confidence, and after the last most powerful sacrificial refining method was applied to the black crystal skeleton, after seeing that it was still useless, Yin Ning roared angrily, threw the black crystal skeleton fiercely, and hit the stone wall on one side.

But after soon calming down, Yin Ning picked up the black crystal skeleton that was still as bright as new and held it up in front of his eyes, rubbing it with his fingertips, feeling a better touch than stroking the mutton fat and jade, and the confusion and self-loss in his eyes because of the failure suddenly changed, and he became firm and persistent again.

"This must be a treasure, that is, it saved me in the Valley of the Walking Dead No. 7 and helped me subdue the refining corpse, this is not my imagination, but a real fact, the reason why I haven't explored the mystery of this thing is because I am missing something, the same thing that can open it, what is that thing?"

Putting aside his impatience and calming down, Yin Ning began to carefully recall the situation when he forcibly subdued the bronze armored walking corpse, hoping to find some clues from his memory, so that he could explore even the slightest method that could drive this black crystal skeleton, and reproduce how this thing showed its might that day, saved himself, and helped him surrender the fierce bronze armored walking corpse.

"It's blood, it's my blood!"

After Yin Ning replayed all the memories of himself before he fainted in his mind no less than ten times, he finally had a flash of inspiration, blessed his soul, and finally discovered something that might be the key to unlocking the black crystal skeleton.

"Yes, before I fainted, I remember that because my corpse control mark did not control the original spirit of the bronze armor walking corpse, I was counterattacked, not only did I spit blood from my mouth, but also my eyes, ears and nose began to seep blood, and the blood that flowed out not only flowed to my cheeks and neck, but also the clothes on my chest were also soaked with the blood from my mouth, and the black crystal skeleton was exactly in that position. ”

"It must be, it must have been activated by my blood, otherwise why after waking up, there are no blood stains on the face, neck and chest clothes, it must have been absorbed by this black crystal skeleton, blood is undoubtedly the medium to open it. ”

After knowing that his own blood could open the dark crystal skeleton that he was haunted by, the cautious Yin Ning did not wait to bite his finger immediately and drip his blood on the black crystal skeleton, but began to hesitate.

"A treasure that needs blood to drive, how can it be the same as the legendary evil weapon monster, if I really drip blood, it won't keep sucking it, sucking my blood dry, turning me into a dry corpse!"

"Probably not, the last time I was seriously injured and unconscious, it could completely drain my blood, but it didn't do that, but instead helped me to subdue the refining corpse, although I am not the owner of this treasure yet, but at least I can be sure that this dark crystal skeleton that I have been wearing for almost six years will not hurt me. ”

Although he was terrified in his heart, in the end, the frenzy and luck in his heart still overcame those Xu senses, Yin Ning bit his finger, endured the pain, squeezed out a drop of red blood, and solemnly dropped it on the black crystal skeleton.

Buzzing!

The blood was indeed the stimulus of this black crystal skull, as soon as it dropped to the top of this skull, the skull began to tremble slightly, as if it had been awakened from a long sleep, and then in Yin Ning's shocked gaze, his drop of red blood spread out like ink, impregnating the entire skull, making the original black skull begin to transform into blood red, looking extremely demonic and evil.

The crystal skeleton seemed to be not satisfied with its already amazing enough change, and began to grow rapidly in Yin Ning's flat palm, and in the exclamation of the viewer Yin Ning, it changed from the size of a jujube core to the size of a fist in the blink of an eye.

The amazing changes on the outside of the crystal skeleton stopped, and the blood color on the surface gradually dissipated, turning into a transparent color, which gradually allowed Yin Ning to see the inside, but a dragon battle began to be staged inside the skull, after another tremor, in the two hollow eye sockets on the left and right of the crystal skeleton, there was a purple-black light and a pure white light condensed, and the two mysterious rays were swelled into a mass from the size of a bean grain, filling the eye sockets, such as the eyes of the crystal skeleton, a purple-black light mist and a pure white fog began to appear inside the skull, respectively, quickly dispersed, occupying half of the skull space。

Although they were both born from the crystal skeleton, as soon as the two mists came into contact, they were like enemies of life and death, constantly squeezing and colliding, desperately trying to suppress the other party back.

The purple-black and pure white qi fought for a long time, and finally it was condensed more firmly and solidly, and the purple-black qi that was already in a state of light and mist began to gradually occupy the upper peak, gradually pushing the pure white qi over, from the left half of the skull that originally occupied it, and soon expanded to two-thirds of the space of the entire skull, squeezing the pure white qi to the side.

"Oh no! The pure white qi can't beat the purple and black qi, I have to help it. ”

The last time Yin Ning, who passed out because of the backlash, didn't see which of the black and white qi saved his life and helped him subdue the corpse, but there is no doubt that the pure white qi is more like the things of the righteous path immortal family, so naturally Yin Ning also recognized the pure white qi as his life-saving benefactor, and after seeing that it was suppressed and driven back by the demonic purple and black qi, he was naturally in a hurry, and couldn't help but exclaim.

Almost without thinking, Yin Ning put his right palm against the right half of the skull without a teacher, and then after a low shout, he desperately began to inject mana into it.

Buzz!

With the injection of Yin Ning's mana, the skull began to tremble slightly, and then immediately changed suddenly, the pure white light in the right eye socket of the skull became more and more shining brightly, and the pure white qi born by it naturally rose sharply, only in a few breaths from the state of dense fog to the state of light and mist that was like a substance, and under the continuous injection of Yin Ning's mana, the pure white light mist became more and more condensed, and finally began to surpass the purple and black light mist, in the fight, it also gradually began to occupy the top, not only recovering the lost ground, but also began to counterattack, driving the purple and black light mist back to the left half of the skull, and broke through the middle line, and began to attack the original purple and black light and fog in a big way。

"That's it, let's press this evil aura back!"

Under the continuous injection of Yin Ning's mana of "Grace and Revenge", the purple-black light mist was finally overwhelmed, and was dispersed by the more and more majestic pure white light mist, as the purple-black light cluster in the left eye socket of the skull gradually extinguished, the purple-black light mist lost its pillar, and instantly collapsed and disappeared, and the pure white light mist began to occupy the entire inside of the skull, and the entire skull also turned into a pure white color, as if carved from white jade, which was extremely pleasing to the eye.

Yin Ning, who thought that the pure white qi was his life-saving benefactor, although he took revenge on the purple-black qi, but by mistake, it also made Yin Ning discover another great anti-heaven ability of this crystal skull.

"What now?"

After the pure white qi completely occupied the dominant skull, Yin Ning, who had consumed most of the mana, also removed his right hand with a sweat on his forehead and stopped injecting mana, but looking at the pure white skull that became motionless after he stopped injecting mana, Yin Ning muttered in wonder again.

Just when Yin Ning wanted to inject mana into the skull again, the pure white skull finally took action, and in Yin Ning's shocked gaze, the pure white light cluster in the right eye socket of the skull suddenly collapsed, and a large cloud of pure white mist floated out from the right eye socket, and a palm-sized pure white cloud formed three feet in front of Yin Ning.

"This cloud has no aura fluctuations, and it doesn't look like a thing in the immortal cultivation realm, what's the use?"

Yin Ning felt that this cloud could not resonate with the mana in his dantian, and took it for granted that this cloud had nothing to do with cultivating immortals, but he still firmly believed that this cloud must have other magical functions, so Yin Ning, who did not give up, began to experiment.

Yin Ning first took out some mortal objects, such as the book that recorded "Qiu Shui Gong" and his homemade hourglass, and threw them into the pure white clouds, although they were magically held up by the clouds and did not fall, but there was no change.

Yin Ning saw that the mortal supplies were useless, after hesitating again and again, he gritted his teeth and carefully reached in and took out the book and hourglass, and after seeing that the clouds were still unchanged, he breathed a sigh of relief at the same time, Yin Ning was also extremely disappointed, and under his frightened risk, it also proved that this cloud has no effect on the human body.

Then, Yin Ning began to take out jade slips and other cultivation items and began to throw them into the clouds, but he was still only dragged by the clouds, and there was no change, which made Yin Ning completely panicked and anxious, and began to lose his mind a little, and launched a ruthless attack, pulling out the items in his storage bag one by one, and throwing them into the clouds without looking.

There was no reaction when the magic weapon was thrown in, there was no reaction when the elixir was thrown in, and there was no response when the talisman was thrown in, but just when Yin Ning was about to despair, he unconsciously threw a spirit stone that had already been placed on the stone table into the clouds, and the reaction and change that made Yin Ning cry with joy finally happened.

I saw that the clouds that rolled the spirit stone into it kept tumbling and surging, and instantly spread out from the size of a palm to the size of a plate, throwing out all the magic weapons and pills that Yin Ning had originally thrown in, leaving only the blue light in the center of the water attribute spirit stone, and then began to retract and roll back quickly, wrapping the spirit stone tightly layer by layer, and finally changing into a pure white cocoon-like object, suspended in the air, the light kept flashing, and the slight tremor kept stopping, as if it was transforming and re-breeding the things that were tightly wrapped by it.

Phew!Bah!......

In the tremor frequency that was almost the same as Yin Ning's heartbeat, the pure white color on the surface of the pure white cocoon began to gradually dissipate, from pure white to snow white, and from snow white to feather white...... Finally, when the clouds began to appear pale white, a loud scream suddenly came out from inside the clouds, which shocked Yin Ning, who had been observing carefully, but at the same time, he was also sent by the ghost to stretch out his right hand, stick to the right half of the skull, and began to inject all the mana left in his dantian into the pure white skull with a somewhat light surface color.

Under the injection of Yin Ning's mana, the dim pure white skull was shining again, and wisps of pure white mist were floating out of the right eye socket, which automatically floated to the vicinity of the light white clouds, and then rushed to frantically merge into the light white clouds, making the color of the light white clouds darker and darker, and began to change from the color of light white to the color of feather white, and then the color of snow white, but perhaps because of the too little mana injected by Yin Ning, the color of this cloud did not change to the original pure white color in the end, but this was enough.

After only a short while, the clouds that changed from snow-white to feather-white finally stopped flickering and trembling, and after making a crisp and loud tearing sound, a crack suddenly opened at the bottom of the cloud like a silkworm cocoon, and a shining star-like thing suddenly leaked out of this gap, falling straight down, and was quickly caught in the hand of Yin Ning, who had been paying attention to the sidelines.

Yin Ning couldn't wait to open his palm, glanced at the small spar lying in his palm, his eyes suddenly widened, and all kinds of expressions on his face first froze at once, and then a color of ecstasy that had never appeared before began to appear on his face, and the ecstatic Yin Ning couldn't help but roar.

"Medium-grade spirit stones!"