However, before Xingyuan and Cai'er could discuss whether to enter the tower to explore, the previous brain-piercing demonic sound and the sharp howling of undead creatures sounded again.

It’s not because their rest time is over, but because they noticed the two invaders, Xingyuan and Caier.

Those ghosts and spirits hovering at the top of the cave, with their bodies in the form of clouds, attacked them from top to bottom with shrill screams.

"Xingyuan, is it okay for you to be alone?"

Cai'er acted decisively, and a dark golden light condensed in her palm, instantly transforming into a dark golden dagger.

With her current strength and the spiritual power with purification attributes, it is naturally a simple matter for her to kill the spirits of these ghosts. However, she is a little worried about leaving Xingyuan alone there, fearing that he will be invaded by the aura of the undead here.

"Cai'er, you underestimate me, don't you?"

Xing Yuan said with a somewhat awkward expression: "Don't think that I am powerless just because you have been holding me for so long."

After saying that, Xingyuan began to mobilize the spiritual power in his body and set down a spiritual power shield with sacred light attributes around him, keeping out all the undead auras that attempted to invade their bodies and plunder their vitality.

"Don't forget that I majored in three types of elemental magic at the same time."

Xingyuan made a gesture to Cai'er to reassure her, "Don't worry about me, just go and deal with those undead."

After confirming that the elemental shield released by Xingyuan was indeed at the level of a fifth-order advanced light magician, Cai'er didn't say anything more. She turned around and disappeared on the spot.

As the most talented and skilled ace assassin since the founding of the Assassin's Temple, Cai'er was naturally immune to the invasion of the undead aura. Fighting in this environment, she was even more like an undead than these undead creatures.

Even with a mental strength as strong as Xingyuan, he lost track of Cai'er several times during the process.

Although the aura of death here is so dense that it is almost tangible, and will indeed greatly affect Xingyuan's mental power in exploring this place and narrow his perception range, the most important thing is that Cai'er's own ability to conceal her aura is strong enough.

Even if it wasn't in this Howling Cave of Terror, Cai'er would have a great chance of escaping his detection.

Looking at Cai'er, who was as swift as a ghost in the cave and completely wiped out several undead creatures and turned them into a puff of green smoke every time she swung her sword, Xingyuan couldn't help but feel curious.

If he had faced Cai'er in the Demon Hunting Team selection, and if they were not in a romantic relationship, and Cai'er had not let him go and handed over the victory, the two of them would have competed with their most serious attitude, and who would have been stronger?

It is true that Cai'er's speed and stealth are powerful enough to escape his mental lock, but don't forget that Xingyuan also has the ability of future vision that can be activated at any time to predict Cai'er's attack position and timing in advance every time.

As an earth magician, Xingyuan's most powerful means are defense and control.

Therefore, if he and Cai'er were to engage in a life-and-death battle, the final winner could only win by exhausting all of the opponent's spiritual power.

Of course, this doesn’t mean that if Xingyuan and Caier fight, he will definitely lose.

Even though Cai'er's total internal spiritual power is higher than his at this stage, he still has the elemental elf Xingyue to help him recover his spiritual power. If we really come to it, it's hard to say who will win or lose.

……

Cai'er was very fast. With every breath of Xingyuan, she could kill nearly a dozen undead who wanted to attack them.

It was just that these undead seemed to be endless, and Cai'er was already showing signs of slowing down. Even as a killing machine carefully trained by the Assassin's Temple, she would need time to catch her breath.

Several holy bombs passed through Cai'er's side, dissolving the endless stream of undead that attacked her on the spot, without even a trace of smoke left.

"Cai'er, come back soon."

Xingyuan chanted a spell to generate earth waves under his feet, carrying him towards Cai'er.

"Bang bang bang-"

Those endless undead spirits that rushed forward with an attack even more ferocious and fearless than the dual-blade demons, one by one crashed into the holy light shield generated by the star source, and then turned into ashes.

He didn't know if it was Xingyuan's illusion, but he felt vaguely that the strength of these undead seemed to have increased a little just now. At least when they crashed into him just now, the speed at which Xingyuan's spiritual power was lost was not as fast as it is now.

After hearing Xingyuan's call, Cai'er no longer chose to fight the enemy alone. She tapped the cave wall with her toes, and her petite figure drilled into the protective shield released by Xingyuan.

"These undead creatures are endless to kill."

After Cai'er finished describing her discovery in a concise manner, she put away the dagger in her hand, took out a porcelain bottle containing the Xingyuan special Huiling Pill from her storage ring, poured out a pill and put it into her mouth.

It was as if he had opened his door to the star source, believing that he could resist the attack of these undead spirits.

"Ah."

Xing Yuan also replied after hearing this: "Because this tower is constantly releasing undead spirits to ensure that the concentration of undead spirits in this cave will not decrease."

Cai'er nodded slightly, then sat cross-legged at Xingyuan's feet, and began to digest the medicinal power of the Huiling Pill while waiting for Xingyuan's next instructions.

"And it may be that the purifying power contained in your reincarnation furnace has too significant an inhibitory effect on them. I can feel that the strength of these undead spirits is constantly increasing."

"Are we going to retreat then?"

Cai'er digested the effect of the Soul-Restoring Pill that Xingyuan specially prepared for her in just a few words. She opened her eyes and said to him, "Xingyuan, I can feel that the aura of the undead here is not only not decreasing, but the concentration is getting higher and higher. Other undead creatures may appear soon."

"I would like to retreat. After all, from the perspective of the general-level demon hunter group, we should have perfectly completed this exploration mission."

"Xingyuan, what's wrong?"

Cai'er felt something was wrong because she knew Xingyuan too well.

She knew that every time the other party spoke to her in this tone, he would tell her more bad news.

"The way back is blocked."

While Xingyuan was quietly telling Cai'er the bad news, he also used the Spirit Demon-level Light Magic Wand in his other hand to shoot a holy bomb in the direction from which the two had just come, evaporating all the fog that reduced their visibility, so that she could also know the "bad news". (End of this chapter)