If Wu Jun could follow Wu Yu around in Demon Immortal Realm, their movements would be a lot smoother. This would be equivalent to having a senior protecting him.

However, the pressing issue was still to resolve the matter with Jiu Ying.

Wu Jun explained he found an elite great void immortal design named Ancient Immortal Dragon Rectifying Extremist immortal design from the ancient scrolls referencing the Ancient Demon Dragon Perpetual Devourer immortal design. This immortal design had similar effects as the Ancient Demon Dragon Perpetual Devourer immortal design, capable of strengthening a consciousness or spirit of someone within the immortal design.

Diabolical Dragon King had set up the Ancient Demon Dragon Perpetual Devourer immortal design to reinforce the intensity of his spirit devourer, enabling it to gobble up the spirit remnant of the Apocalyptic Chaos Demon and eventually gaining control over Jiu Ying's body.

As for Wu Jun's Ancient Immortal Dragon Rectifying Extremist immortal design, it could reinforce the consciousness of Jiu Ying within his body, empowering Jiu Ying to have the ability to go against the spirit devourer of Diabolical Dragon King and the spirit remnant of the Apocalyptic Chaos Demon.

In fact, even if he had to face against both of them, it wouldn't be a big issue.

After all, Wu Yu had been using Spirit Chaser Art against Diabolical Dragon King's spirit devourer and Apocalyptic Chaos Demon's spirit remnant. Since then, they had been weakened by over 90% of their peak. On the other hand, the Ancient Immortal Dragon Rectifying Extremist immortal design would be leveraging on the soul and spirit energy of all living creatures in the Ancient Demon Realm.

Diabolical Dragon King was a Nine-Headed Diabolical Sable Dragon, a species of dragon. He shared the same roots as the mystical dragon tribe and therefore Wu Jun was able to find a similar immortal design from ancient scrolls.

The Ancient Immortal Dragon Rectifying Extremist immortal design was capable of rectifying one's aboriginal soul, providing extreme protection and support to Jiu Ying's consciousness, strengthening it to an exceptional level.

Nonetheless, the immortal design had to be set up first.

"Jiu Ying's consciousness is still too weak relative to the spirit devourer and spirit remnant. For him to go against both of them at the same time, it would require the entire Ancient Demon Realm to be covered by the great void immortal design."

Wu Jun pondered, estimated the strength of Jiu Ying's consciousness and compared it to the sum of the spirit devourer and spirit remnant. Only then he realized the situation wasn't ideal.

For Diabolical Dragon King to use Ancient Demon Dragon Perpetual Devourer immortal design to strengthen his spirit devourer to the extent capable of devouring the spirit remnant, he just needed some time to set up a great void immortal design to encompass the entire Underworld Dragon's Den.

However, for Jiu Ying to go against the spirit devourer and spirit remnant at the same time, the immortal design required would have to be stronger and the time required to set up would be substantially longer. Furthermore, Jiu Ying's consciousness had a lower base to begin with.

The entire Ancient Demon Realm was slightly smaller than the Underworld Dragon's Den. Fortunately, there were countless living creatures in the Ancient Demon Realm and Jiu Ying could borrow their strength for this.

On the other hand, there were few living creatures in Underworld Dragon's Den. Most of them were the female demons serving the demon kings in their palaces. In terms of sheer number, the difference in number of demon cultivators was drastic.

Therefore, Wu Yu and Wu Jun just have to set up an Ancient Immortal Dragon Rectifying Extremist immortal design that covered the entire Ancient Demon Realm. By borrowing the soul and spirit energy of all living creatures within, Jiu Ying should be able to gain sufficient strength to go against the spirit devourer and spirit remnant.

Ancient Demon Realm was a lesser realm to begin with. Compared to the spirit devourer that was closed to the level of an eternal demon emperor or the spirit remnant left behind by an eternal demon emperor, it would be too fragile.

Without the Ancient Immortal Dragon Rectifying Extremist immortal design to reinforce, Jiu Ying might not be able to stand his ground against either one even with the energy from all living creatures in Ancient Demon Realm.

After making his estimation, Wu Jin starting laying his immortal design. During this period, Wu Yu, Full Moon of Nanshan and Ye Xixi also provided aid. Even so, they took a thousand years before setting up the immortal design that covered the entire Ancient Demon Realm.

After all, the immortal design would be borrowing the soul and spirit energy of all living creatures in the Ancient Demon Realm. There were more details that had to be handled as compared to the Ancient Demon Dragon Perpetual Devourer immortal design. Therefore, the time needed to set up the design was a lot longer than the time required to lay the Ancient Demon Dragon Perpetual Devourer immortal design over Underworld Dragon's Den.

A thousand years passed in a blink of an eye.

In the mortal domain, a thousand years were all it took to bring great changes. Dynasties might have ended and monarchies overthrown. However, this was just a brief period for an immortal.

After a thousand years, the Ancient Immortal Dragon Rectifying Extremist immortal design that covered the entire Ancient Demon Realm was finally completed by Wu Jun and Wu Yu's group.

In this process, Wu Yu took time off to smash the spirit devourer and spirit remnant with Spirit Chaser Art. Obviously, he done so when the opportunity arose as both of them were been hiding within Jiu Ying most of the time.

As time passed in the thousand years, Wu Yu had several opportunities and used Spirit Chaser Art countless times. Whenever the other party just showed up, he would blast it with Spirit Chaser Art. As a result the intensity of spirit devourer and spirit remnant was further weakened another half.

When the Ancient Immortal Dragon Rectifying Extremist immortal design was set up, Wu Yu knew the most critical juncture was here.

With everything prepared, Wu Jun activated the Ancient Immortal Dragon Rectifying Extremist immortal design accordingly. The entire Ancient Demon Realm was used as the foundation and the soul and spirit energy of all living creatures were mobilized by the immortal design!

Wu Jun trapped Jiu Ying at the epicenter of the Ancient Immortal Dragon Rectifying Extremist immortal design. After he found where Jiu Ying's consciousness was, he controlled the immortal design personally and directed all the soul and spirit energy collected by the immortal design into Jiu Ying's consciousness!

In just brief moments, Jiu Ying's consciousness was strengthened more than a thousand times over.

This level was basically the sum of the spirit devourer and spirit remnant currently.

When Jiu Ying's consciousness was strengthening, the spirit devourer of Diabolical Dragon King and the spirit remnant of the Apocalyptic Chaos Demon felt an extreme threat from the corner where Jiu Ying's demon spirit was instantly.

"Brat, you wouldn't get an easy death!"

Diabolical Dragon King's spirit devourer felt the circumstances weren't right and shrieked like a maniac. At the same time, he launched attacks against Jiu Ying's consciousness!

As for the spirit remnant of the Apocalyptic Chaos Demon, he felt the threat from Jiu Ying as well. Almost at the same time, he started gobbling towards Jiu Ying's consciousness frenziedly. An extremely chilling and sinister aura burst forth and was building up constantly in Jiu Ying's body.

Jiu Ying's body became the battleground for the three sources of horrifying energy. Only the final victor would have the rights to survive and gain control of the body.

The aura from the alliance of spirit devourer and spirit remnant was overwhelming, making it almost impossible for the Ancient Immortal Dragon Rectifying Extremist immortal design to suppress.

Fortunately, the soul and spirit energy gathered from trillions of living creatures in Ancient Demon Realm was added to Jiu Ying. Yet, when Jiu Ying clashed against the alliance of the spirit devourer and spirit remnant, he was at a disadvantageous position.

Wu Yu couldn't just sit back and wait for the outcome. He gritted his teeth and sent a Spirit Chaser Art towards Jiu Ying again.

Now, Jiu Ying's consciousness, the spirit devourer and spirit remnant were apparent. Wu Yu was able to distinctly differentiate them from Jiu Ying's spirit. He could direct his Spirit Chaser Art to the desired target and therefore had launched it at the spirit devourer.

In Wu Yu's perspective, the threat of the spirit devourer was a lot higher than the spirit remnant of the Apocalyptic Chaos Demon. After all, the spirit devourer still retained its ability to think despite losing the connection with the Diabolical Dragon King.

However, the spirit remnant didn't have any intelligence. All it had was its survival instincts.

In comparison, although both of them had similar strength, the spirit devourer would be harder to deal with.

Basically, the spirit remnant of the Apocalyptic Chaos Demon was fronting a frenzied assault on Jiu Ying's consciousness while the spirit devourer was launching sneak attacks from the sides to assist the spirit remnant.

This situation was what the spirit devourer wanted. As Jiu Ying's consciousness was eventually eliminated, his strength would be a lot stronger than the spirit remnant.

Unfortunately, since Wu Yu and Wu Jun were around, they definitely wouldn't allow the spirit devourer and spirit remnant to remain in the body of Jiu Ying.

"Spirit Chaser Art! Kill him!"

Wu Yu cast Spirit Chaser Art after Spirit Chaser Art. This attack was no longer disastrous for the spirit devourer and spirit remnant. Nonetheless, the attack could still affect the combined strength of both parties. By aiding Jiu Ying from the exterior, the pressure Jiu Ying was facing would be substantially lower.

Wu Jun kept control of the immortal design, constantly reinforcing and protecting Jiu Ying's consciousness with the constantly flowing soul and spirit energy. This maintained Jiu Ying's strength at a certain level.

As for the spirit devourer and spirit remnant, although they had the upper hand when they worked together against Jiu Ying's consciousness, they were gradually losing the edge.

"Grrrr!"

Jiu Ying was brimming with endless anger against Diabolical Dragon King after being imprisoned for a long time. Now that Wu Yu was helping him and creating opportunities for him to counterattack, he naturally wouldn't hesitate and unleash all his strength in a constant barrage against the spirit devourer and spirit remnant.

This process was protracted. Although Jiu Ying was gaining an advantage, it wouldn't be soon until he could completely defeat the other parties. It was especially so as the spirit devourer was preserving his strength. To completely assimilate him, it would still take time.

Jiu Ying coordinated with Wu Yu. When Spirit Chaser Art was used, Jiu Ying would unleashed his accumulated strength in a burst. On most occasions, he was able to assimilate a portion of the spirit devourer or spirit remnant.

Both of them continued their teamwork until three years later. The alliance of the spirit devourer and spirit remnant finally came to an end. Despite holding on for so long and them still having 80% of their strength left, they crumpled quickly and could no longer put up any resistance. What awaited them were to be assimilated.

Over the three years, the combined strength of the spirit devourer and spirit remnant were only reduced by 20%. However, this would deteriorate rapidly as time passed. When Jiu Ying assimilated another portion of the spirit remnant, the other parties crumbled.

Under the reinforcement from the immortal design to Jiu Ying's consciousness, Jiu Ying started assimilating the lingering portions of the spirit devourer and spirit remnant!