A quarter of an hour later, a small white jade spirit boat left the Hundred Refining City and headed for the Demon Domain.

At the head of the boat, Sun Kai sat cross-legged, controlling the direction of the white jade spirit boat, while the group of nine people in the back also sat cross-legged on the futon, quietly waiting to reach the destination.

At present, in their ranks, there are five monks who have practiced the Great Perfection of Qi, and there are four in the early stage of foundation building, but Sun Kai is a monk in the middle stage of foundation building.

In terms of the strength of their team, the third regiment of the Hundred Refining Legion can only be regarded as a middle and lower level, because some teams are all composed of monks who have cultivated above the foundation building period, and the overall strength is very strong.

However, the tasks they need to do are even more difficult, and they often need to sneak into the inner encirclement of the demon domain to fight those fifth-order demon beasts.

It is said that the leader of the first regiment of the Hundred Refining Legion is a monk of the Great Perfection of the Foundation Building Period, whose strength is not inferior to that of ordinary True Dan Realm monks, and he has even killed demon beasts above the fifth order when he has done tasks in the Demon Domain.

Although it was the whole team that worked together to kill it, it was enough to show that the strength of the first regiment was the first in the entire third regiment.

An hour after Sun Kai and the others left the Hundred Refining City, the monks of the first regiment also followed them in the white jade spirit boat and set off towards the Demon Domain.

Three days later, Yu Yilie and the others passed through the periphery of the Demon Domain again and came to the inner enclosure, and they did not linger along the way, but rushed to the mission location non-stop.

At this time, Yu Yilie was in the middle and rear of the team, and he followed the team while releasing his divine sense to probe the surrounding situation.

However, to his surprise, the route of their mission this time was the same as the route he had taken to the Ten Thousand Bat Caves last time.

Although he didn't know exactly what to investigate there, it was obvious that the danger level was very high, and Yu Yilie couldn't help but be secretly vigilant in his heart.

He only went a little deeper last time, and he encountered two fifth-order demon beasts, if he hadn't run fast, he was afraid that he would have been torn to pieces and fed to the cubs of those two demon beasts.

An hour later, Sun Kai led them to the range that passed through the Ten Thousand Bat Caves and came to a small hillside.

"Ladies and gentlemen, our destination has arrived, according to the intelligence, there is a fifth-order Qingluan Divine Bird here, and a fourth-order Great Perfection Fire Phoenix, what we have to do is to sneak in and confirm whether that Fire Phoenix is facing a breakthrough, if the information is true, we must prevent it from breaking through! It is best to introduce that Qingluan into the range of the Thunder Tribulation when the Fire Phoenix crosses the Tribulation, so that it can be completely destroyed. Sun Kai sighed slowly at this time, and said to everyone with a solemn and abnormal look.

Hearing this, Yu Yilie couldn't help but be shocked in his heart, but he didn't expect him to escape from here, and Hundred Refining City issued a task for them to come here to investigate.

At that time, it was too late for him to hide, how could he have time to check whether the fire phoenix was a fourth-order or a fifth-order, but he was afraid that as soon as his spiritual sense was found out, he would be detected by the fire phoenix and be caught and torn to pieces.

However, he had seen that Qingluan from a distance, and its size was indeed a little bigger than that fire phoenix.

But once the demon beast reaches the fourth order, it can control its body shape freely, and it is generally only when it is in battle that its true body is revealed, but it is difficult to judge its strength.

Thinking silently in his heart, Yu Yilie was thinking about how to run away if he was discovered.

If the mission fails and is discovered by those two demon beasts, he will definitely be the first to start running, and the destination is naturally the underground dark river.

Following the dark river, he could go directly to the outskirts of the Demon Domain, but it was a very safe route.

Although there were countless blood-devouring demon leeches in the underground dark river, after he returned to the Hundred Refining City, he found a way to deal with those demon leeches, but as long as he sprinkled the male yellow into the dark river, he could expel those demon leeches and make them dare not approach.

"Before I came, the archdeacon handed me three Heavenly Thunder Seeds, each of which was equivalent to the full force of the True Dan Realm monk's blow, and now we are divided into three waves, and each wave of people will bring a Heavenly Thunder Seed and sneak into the territory of these two demon beasts. If you find that the fire phoenix is about to break through in the tribulation, you will send a signal with a transmission note, and at the same time send the heavenly thunder into the tribulation clouds, so that it will be wiped out under the thunder tribulation!" Sun Kai calmly ordered everyone.

Immediately, Sun Kai handed over the three Heavenly Thunder Sons to the three monks in the foundation building period, and asked them to lead two people to set off, sneak into the territory of the demon beast, and wait for the opportunity to move.

Yu Yilie was on a team with Sun Kai, and there were two other monks who practiced Qi and Great Perfection and they were on a team.

Immediately, the group of four people gathered their breath and quietly dived into the territory of the demon beast.

During this period, I saw a cyan phoenix bird patrolling over the territory from time to time, which also confirmed Sun Kai's guess even more, that fire phoenix was preparing to cross the catastrophe!

An hour later, Yu Yilie came to the dense forest lurking near the towering ancient tree again, and Yu Yilie smiled bitterly in his heart.

The other two groups of people had also lurked nearby at this time, monitoring every move on the ancient tree, waiting for the fire phoenix to cross the calamity.

Three days passed quickly, and Yu Yilie and the others did not see the fire phoenix come out of the nest during this period.

When Yu Yilie found that there were three missing spirit fruits on the ancient tree, he couldn't help but faintly confirm in his heart that the information should be true, because he stole one, and the other two must have been swallowed by the fire phoenix.

The rest of the people began to doubt the accuracy of the information in their hearts during this long wait, after all, the information could change at any time, and this was only their deduction from the previous information.

If the fire phoenix hadn't reached the realm of breakthrough, they would naturally not have to spend so much effort to release the Heavenly Thunder Son.

But with the huge energy fluctuations coming from the ancient tree, Sun Kai decisively ordered everyone to prepare to wait for the opportunity to move and throw the Heavenly Thunder into the Thunder Tribulation.

And at the same time as this energy fluctuation spread, the Qingluan Divine Bird that was patrolling the territory also returned here, retracting its wings on a nearby big tree, standing on the branch and looking at the ancient tree with concerned eyes.

A day and a night later, when the energy fluctuations in the ancient tree reached its fullest, the originally clear sky began to become abnormal, and the aura of heaven and earth converged into acres of black clouds, and lightning swam in them, as if they were about to tear apart the existence below.

At this moment, a crimson phoenix, which was only a foot in size, flew out of the nest of the ancient tree and met the black clouds in the sky.

Flames swirled around its wings, as if to burn the thick black clouds.

In the sky, the black clouds were still converging, and lightning was brewing in them, obviously preparing to bombard them in one fell swoop after condensing the greatest strength.

However, in each of the three directions, a purple bead the size of a dragon's eye flew out, and it burrowed into the clouds at an extremely fast speed.

"Huh!" Huo Feng suddenly roared in anger, not caring about the thunder tribulation, he waved his wings and shot down the two heavenly thunderbolts one after another, but unfortunately, there was still one heavenly thunder that got into the clouds.