The next moment, a dark blue flame like a ghost fire appeared on the old man's right hand 掌️, and after wrapping the copper bell, he slowly added the materials in his left hand, and directly refined it in front of Li Yuan.

The old man's refining methods were quite clever, and even Li Yuan was dumbfounded when he saw it.

It only took less than half an hour for the old man to suddenly withdraw his hand and return a dark blue bell to Li Yuan's hand.

"This corpse control bell has been re-refined by me, and the stability should be higher, as long as the strength of your four-headed zombies does not exceed the foundation building period, this bell should be able to suppress them, but you should also pay attention to the fact that if your own strength is insufficient, you should try not to let them improve too quickly. The old man said solemnly.

Li Yuan naturally understood this truth, and after putting away the corpse control bell, he re-asked the four mutated iron corpses to recognize their owners under the old man's suggestion, so that they could continue to absorb the netherworld qi on the side.

......

In this way, a few months later, these four iron corpses really succeeded in advancing and broke through to the early stage of foundation building.

And through these few months, Li Yuan not only practiced the first part of the Thunder Law to the fullest, but also successfully upgraded the Heavenly Thunder Seed in his body to the intermediate level after absorbing the thunder sacrifice materials given to him by the old man of the ghost immortal.

And for a period of time after that, in addition to hiding from the old man and secretly sacrificing the piece of thunder, Li Yuan used the power of the thunder to help the old man expel the evil qi in his body every once in a while, of course, the evil qi in his own body naturally disappeared after the thunder was upgraded to the intermediate level.

A year later.

Somewhere in the Netherworld, a sudden wind howled, and black clouds covered the sky, a scene of the coming of the end of the world.

And on the ground shrouded in this cloud, there were six figures, four of them with green faces and fangs, covered in black gas, and the other two were a young man wearing a cyan Taoist robe, a Taoist priest's hair bun, and a white-haired old man wearing a dark blue robe, with an illusory figure.

"Okay, this immortal has already set up a Yin Gathering Great Array here, and in a while, he will use the power of the formation to gather a large amount of Netherworld Qi, if it succeeds, it should be able to break through within three days. The old man took a deep breath and slowly walked towards a huge black gas vortex in front of him.

"Senior, how do you plan to deal with the Heavenly Tribulation at that time, do you need me to stay here to help?" Just as the old man was about to walk into the black qi vortex, Li Yuan suddenly stopped the other party.

The old man slowly stopped, did not look back, and said directly: "There seems to be no Heavenly Dao will in this Netherworld, and it will not trigger the Heavenly Tribulation, but it may not be said after going out, so even if the immortal goes out, he must be extremely careful and find a way to cover up the heavenly opportunity." ”

Li Yuan nodded silently, thinking that it was no wonder that his four evil iron corpses had already given Li Yuan a new name "Soul Corpse".

It is no wonder that the four-headed underworld corpses did not attract the Thunder Tribulation after breaking through the foundation building period, it turned out that there was no Heavenly Dao will to pay attention to this netherworld.

Seeing that the old man walked into the Yin Gathering Great Array, Li Yuan didn't leave, but just sat down casually a little farther away and began to close his eyes and recuperate.

Three days passed in a blink of an eye.

When the huge black gas vortex disappeared, the sky was dark, and the earth-shaking scene did not appear.

Without the Heavenly Tribulation, the breakthrough of the old man of the ghost immortal seemed extremely dull.

Just like that, the old man flashed step by step, as if teleporting, and appeared in front of Li Yuan after a few steps.

It's just that when Li Yuan looked at him at this moment, for some reason, he felt that the other party was completely different, and there was a palpitating feeling for no reason.

"That's it?" Li Yuan asked unconvinced.

"Hmm. The ghost fairy old man smiled faintly, and then with a wave of his right hand, a storage bag flew towards Li Yuan.

"Here are two high-level spiritual weapons and one top-grade spiritual weapon refined by this immortal for you, if it weren't for the lack of a few main materials, these three should be top-grade spiritual weapons. The old man said lightly, as if to say something small and could not be found again.

Li Yuan took the storage bag, opened it and swept his divine sense in the bag, and immediately found the three spiritual weapons lying at the bottom of the storage bag, and immediately put the things away with great joy.

"Alright, get ready, we're going out soon. The old man seemed to be a little impatient.

Li Yuan didn't have anything to pack, so after turning around and putting the four ghost corpses that were still absorbing the breath of the Netherworld into the Yin Soul Bag, he looked at the old man of the ghost fairy again and said, "It's okay." ”

"Then the immortal will do it!"

As soon as the words fell, Li Yuan saw the old man of the ghost fairy break through and rise into the air, and appeared in mid-air in a blink of an eye.

Immediately afterwards, he saw the old man of the ghost fairy in mid-air, and a terrifying aura erupted, even Li Yuan, who was standing on the ground, suddenly felt like he was about to suffocate.

"Broken!"

With a loud shout, the ghost immortal suspended in the air suddenly made a move, and with a wave of one hand, a huge black magic seal appeared behind him.

"This is the power of the law!"

"This old ghost has actually touched the threshold of the power of the law......?"

Legend has it that only when the power of the law is touched will a magic seal emerge, and when Li Yuan uses the thunder method, at most an illusory rune magic array will appear.

At this moment, the old man of the ghost fairy suddenly raised his right hand and punched it forward.

Bang!

A deafening loud sound came out, and then I saw that in the void where the old man of the ghost fairy was attacking, a wave of space waves rippled out.

It was as if the sky was about to be blasted open by this punch.

But even so, the space-time rift still did not appear.

"The space wall of the Netherworld is so strong!" Li Yuan suddenly gasped.

If such a blow hits him, I'm afraid he won't even have scum left.

But such an attack can't tear through the space!

"Come again!"

The shouts of the ghost fairy old man were heard in the air again, followed by another punch.

Boom!!!

This time, the spatial fluctuations were even more violent, and even the naked eye could see the black particles floating out of the void.

"It's just a little bit closer. Li Yuan also saw that the old man's two punches should have used all his strength, even if he shot again, the power would only decrease, and he would definitely not be able to exert the destructive power of the previous two blows.

"Are you going to fail?" The old man in the sky frowned slightly, revealing a look of unwillingness.

However, this did not hit him, after all, he had just broken through and was not yet familiar with his own strength, as long as he was given a while, the old man was completely sure that he would definitely be able to tear a hole in the wall of this space.

At this moment, as if sensing something, the ghost fairy old man suddenly looked down.