Han Ningbing was even more puzzled, he had absorbed so many memories and didn't find that he would also cross the tribulation during the foundation building period, but now the ghost king and Jairus were in a deep sleep, and there was no way to ask them, but the person in front of him seemed to know something.

He was about to open his mouth to ask something, but a thunderstorm sounded in the sky, and he saw a black thunderbolt rushing from the clouds, Han Ningbing wanted to dodge, but the thunder and lightning seemed to lock onto him, no matter where he hid, the thunder and lightning followed.

Han Ningbing had no choice but to use his spiritual power, and then took out the Xuanyuan Sword, ready to smash the thunder and lightning, but a word came from his ear, and he put away the Xuanyuan Sword and spiritual power.

But Han Ningbing didn't do nothing, he exerted force with his feet, and then jumped up out of thin air, punching the black thunderbolt that was rushing towards him quickly, Han Ningbing only felt a violent force instantly rush into his body, and his body was directly hit by the impact of thunder and lightning on the aura barrier, and the aura barrier laid by the king of the border was strong enough to not be broken.

The cold ice was continuously impacted, and his body was destroyed by the violent energy, he only held on for a moment before fainting, and then the dark clouds dispersed.

The Frontier King frowned suddenly, and then he hurriedly withdrew the aura barrier, and then took the cold condensation ice to the tower behind the City Lord's Mansion.

At this time, a few spiritual senses came over, and then talked to the king of the border for a few words, and suddenly after the city lord's mansion erupted with a shocking force, and then those people left, after the dark clouds dispersed, the people of the border city saw that it was okay, and they slowly came back, but they all guessed what happened, but some people speculated that it was a thunder tribulation according to the records of ancient books.

It was recorded in ancient times that in addition to the need to cross the thunder tribulation when ascending to the immortal realm, if refining the elixir or immortal weapon would cause the thunder tribulation, but there has been no thunder tribulation on this continent for tens of thousands of years, and even the cultivators of the Mahayana period have not appeared, so there are many people who have not seen the thunder tribulation, and some are just recorded and described in books or jade slips.

However, refining immortal weapons and elixirs, it is also impossible to appear, because the most powerful alchemy and refining weapons on this continent are only at the level of the grandmaster, and they are still far from refining immortal weapons and elixirs.

Moreover, this thunder tribulation is different from the one recorded in the ancient books, which records that whether it is a cultivator's tribulation or the appearance of an immortal weapon or elixir, the thunder tribulation caused by it is at least three, and there are five or seven thunder tribulations caused by high-strength or higher-level immortal weapons or elixirs, and they are of different colors, but there has never been a black thunder tribulation.

Therefore, all kinds of speculations slowly spread among the cultivators.

In the City Lord's Mansion of the Border City, the Border King sat alone on the ninth floor of the nine-story tower behind the City Lord's Mansion and pondered.

At that time, after Han Ningbing passed the thunder tribulation, he found that several very powerful spiritual senses swept over, and then he quickly led Han Ningbing away, but those few spiritual senses actually chased over, and the border king released his powerful spiritual sense and spiritual power together, although it was a few points stronger than those spiritual senses, but those spiritual senses were not dead, the border king took out a discarded immortal weapon from his arms, and explained that the immortal weapon he had refined failed, and those people probed the spiritual sense to the abandoned immortal weapon, but the powerful and pure breath on it was indeed an immortal weapon, although they still had doubts, but it could only be explained in this way。

However, they were also surprised by the strength of the Frontier King, before they only knew that the Frontier King was the strength of the early stage of the Yuan Infant, so they dared to probe the spiritual sense, after all, they were also the strength of the early Yuan Infant, I didn't expect him to hide his strength, from the strength he just burst out, I am afraid that he has at least reached the peak of the middle stage of the Yuan Infant, and he is not only strong, but even the refining weapon can refine the immortal weapon, is he an immortal-level refiner? Fortunately, he failed, if he was really allowed to refine the immortal weapon, then I am afraid that no one in the entire continent would be his opponent.

Later, they talked about some cultivation matters among themselves, and they dispersed.

After waiting for them to leave, the Frontier King looked down at the discarded immortal artifact in his hand, and threw it into his storage ring with a little pity, and then swept his spiritual sense through one of the rooms of the City Lord's Mansion, where the unconscious cold ice was lying in it.

Five days later, Han Ningbing woke up slowly, he looked at the surrounding environment, and hurriedly dispersed his spiritual sense, at this time, a powerful spiritual sense also spread over instantly, and Han Ningbing only felt that his spiritual sense was stinged.

Han Ningbing guessed that this should be the person who said that he would cross the catastrophe, but he had no hostility just now, otherwise his soul would be wiped out in an instant, after all, the gap was too big.

Han Ningbing also realized that the location where he was now should be that person's territory, and at this time, that person transmitted the voice to Han Ningbing to the tower behind the City Lord's Mansion.

Only then did Han Ningbing learn that his current location was the City Lord's Mansion, so that person was the City Lord of the City on this side, the King of the Border? He also had some things about the King of the Border in his memory, but he didn't think it was the real him.

The tower was not far from where he was, Han Ningbing walked over slowly, just took a cup of tea, he walked to the tower mountain, and then looked up, there is nothing surprising about this tower, this tower has nine floors, and there is a spire on the top of the nine floors, but the spire is covered by fog, looming.

Each time the tower is raised, the size of that floor is about half smaller, and the top floor is only a few square meters in size.

If you really want to say something special, then its location is very special, because this tower is embedded in a mountain, and the real tower body only leaks a part.

Han Ningbing didn't find out his spiritual sense, as a cultivator in the Yuan Infant Stage, the Frontier King's soul power was extremely strong, and he poked out his spiritual sense in front of him, wasn't that looking for death?

Fortunately, Han Ningbing didn't find out his spiritual sense to check the situation of the tower, because this tower has a special function, that is, it can absorb spiritual consciousness, and if there is a spiritual sense to check the situation of the tower, then his spiritual sense will be swallowed by the tower.

Han Ning Bing walked to the tower door, the tower door opened automatically, Han Ning Bing walked in, and found that it was very empty, and there were only eight teleportation arrays emitting light, and then Han Ning Bing seemed to think of something.

At this time, the border king transmitted another voice and said, "You enter the teleportation array on the far right, and I will wait for you on the ninth floor." ”

Han Ningbing didn't hesitate, and directly entered the teleportation array, he knew that if the Border King wanted to harm him, he would have done it a long time ago, and he wouldn't do it too much.