The two of them were under the sea of fire at this time, and through the bottom of the water above, they could still see many strong people resisting the attack of the Tomb Array, although their eyes swept downward, it seemed that the people above could not see the space where Ling Jun was.

Lazy to ignore these people, Ling Jun continued to move forward under Ah Xi's prompting, and after more than ten minutes, a black gate appeared in the sea of fire in front of him.

"This is it."

Ling Jun carefully observed the stone gate, he didn't find anything unique, and after perceiving it, he didn't find that there was a sealing enchantment, not even a trace of runes appeared, and he couldn't help but feel a little puzzled.

"The Tomb Array has absorbed the huge energy of magma for many years, and now only the outer image remains, and the internal energy has long since disappeared." Listening to Ah Xi's explanation, Ling Jun understood the reason.

"The people who can come here are not mortals, there are so many mechanisms set up in front, in addition to the demon beast handle, there is also a purple spirit fruit to cover up, and even the ghost tomb array can't stop it, so there is no need to waste your efforts now." Ah Xi reminded with a chuckle, but he was still extremely satisfied with Ling Jun's cautious appearance.

Ling Jun nodded in surprise and said, "The appearance of the sea of fire magma can also be regarded as a kind of protection, if you don't have a strong strength or heart, I'm afraid that no one will dare to break into the sea of fire." ”

With a shocked face, Ling Jun pushed open the stone door and walked in.

After passing through the stone door, he put Han Jue aside and entered a black stone hall, the red color had disappeared, there was no luxurious arrangement inside, and there was no mechanism to watch out for, only a sarcophagus, floating empty in the center of the hall.

There was a faint golden glow on the sarcophagus, and if you looked closely, you could feel that there was still some life exuding from the light cluster.

"Mystery Heart!"

Subconsciously said the name in his eyes, a shocked look appeared on his face, his legs couldn't help but move slowly, just getting closer, he could feel the powerful power inside, he believed that if he refined it, it would only be a matter of time before he broke through to the Mysterious Realm, and this process would be greatly shortened compared to a smooth cultivation.

"Knock knock."

Tong Xuanxin also seemed to feel the stranger approaching, and the flickering light made a slight beating sound, as if it was really like a living heart shaking, and the entire stone hall shook with it.

"Is this the legendary Mystery Heart left over from the Mystery Realm?" Ling Jun's gaze condensed, and he said softly.

"Let's go, sir." Ah Xi smiled slightly, and his figure appeared in front of him. Although I didn't pay too much attention to the Mystery Realm, it was relatively rare to be able to get such an opportunity.

"Doesn't there need to be anything to prepare?" Thinking of the demon spirit he had harvested before, Ling Jun had been warned by Ah Xi not to start refining directly, but now this is something left over from the Xuan Realm, so he actually let him start like this?

Ah Xi rolled his eyes and said, "The appearance of the Xuanxin means that the owner of this tomb has died, and some of them will only be negligible remnant soul marks, not demon spirits who still preserve their souls." ”

"Moreover, the Profound Heart is not the kind of thing that allows you to greatly leapfrog your cultivation, it is just to shape your body and increase the possibility of you breaking through the Profound Realm in the future."

I heard that although Ling Jun understood, he still showed a trace of disappointment, after all, he only thought that his strength must be steadily improved, so he no longer dwelled on this issue.

Sitting cross-legged on his knees, Ling Jun closed his eyes to adjust his mood and keep himself stable, and after a while, until his body was completely in a state, and under the control of his mind, he released his aura.

Chijiao followed the aura transmission, his body continued to approach Tong Xuanxin, swam up and hovered on top of the sarcophagus, and with Ling Jun's instructions, he opened his blood mouth and swallowed Tong Xuanxin whole.

The violent aura instantly poured into the Chijiao spirit body, and Ling Jun felt the feedback power, and according to Ah Xi's previous instructions, he continued to inject spiritual energy into Tong Xuan's heart.

The masterless mind unconsciously impacted at this time, and immediately destroyed the unfamiliar aura when it entered itself, and blocked it from the outside.

Despite this, after each impact, the aura consumption was huge, but it did not affect more aura intrusion in the slightest, and thanks to the huge amount of demon pills obtained before, Ling Jun could be replenished in time.

The back-and-forth process continued, and a steady stream of spiritual energy continued to flow through the inside of the Xuan Heart, even if it resisted the blockade with all its might, finally after nearly an hour of resistance, the defense line was completely broken.

After the aura entered Tong Xuan's heart, the subtle remnant soul of the original owner completely lost its influence on Tong Xuanxin, and the last trace of the mark that remained in the world also disappeared.

The two martial arts in the body were exerted at the same time, and the aura began to convey the Xuan Xin to all parts of the body, and as soon as he entered the meridian heart, Ling Jun trembled violently, cold sweat began to appear on his cheeks, and the sharp pain spread from the body throughout the body.

"Heart transformation, this is a process that must be experienced, as long as you withstand this pressure test, there will be nothing to do next!" Ah Xi's soft shout rang in his ears.

Ling Jun gritted his teeth, the severe pain was that his facial expression began to distort a little, and there were bursts of convulsion-like pain, even if he continued to manipulate the aura protection, it didn't have any effect.

Sweat kept coming out, like water dripping down, down Ling Jun's cheeks, all the way down, ticking down on his body, wetting his clothes.

"Ice Protector!" The frog suddenly appeared, and its own chaotic cold qi was continuously transported into Ling Jun's heart vein, turning into an ice stream, protecting the heart vein that was about to collapse, and around it, a faint white ice cold membrane was attached.

Although this layer of white cold film is extremely weak, the effect it brings is excellent, the cold qi not only resists the attack of the Xuan Heart, but also relieves the severe pain in the whole body a lot, Ling Jun's face gradually recovers, although there will be a burst of pain from time to time all over the meridians, but this is already within the range of bearing.

Tong Xuanxin also completed the transformation of the heart vein, and began to replace other meridians, and suddenly a dark red aura suddenly appeared in the cold air, and Ling Jun suddenly realized that something was wrong!

"Blood Demon Poison!"

Unexpectedly, every time at such a time, the blood demon poison would appear, and Ling Jun found that part of it was actually hidden in the body of the frog, and when he recalled the situation when he appeared in the twin, he guessed that it was at that time that it was fused with the soul of the frog.

"Violet Flame Vine!"

Ah Xi seemed to have guessed this phenomenon a long time ago, and took out the violet flame vine prepared in advance, and his two fingers were like a sharp blade, directly cutting a hole in the solid flame vine, releasing the powerful scorching energy in it.

The soul power was connected to Ling Jun's body, and the scorching heat immediately spread throughout his body, accompanied by the guidance of the soul power, incinerating the blood demon poison that had been pre-exploding into ashes in an instant.

Under the two extreme effects of one cold and one hot, the two sides instantly maintained a skillful balance in Ling Jun's body.

Time passed little by little, and the two energies each entered the veins of the two martial arts new cities in the body.