The bronze plate muttered a few words, but the facts were in front of him, so he couldn't be too lazy to be silly, so he could only admit: "Okay, you won! If you want me to do anything, just say it!"

Xu Yang smiled and said, "Now, I haven't thought about it yet. I'll tell you when I think about it."

The bronze plate muttered: "It's really bad to wear this tight hoop on your head..."

Xu Yang smiled, ignoring the bronze plate's humming, and he looked at the octave light ball in his hand.

This forbidden light ball appeared blazing white, like a star.

"I didn't expect that by killing a spirit beast with a middle-class strength among the spirit beasts, you can get such a treasure. It seems that the owner of this underground palace is really generous." Xu Yang took out the four-star secret key obtained by killing the Blue Eye Pterodactyl and said with emotion.

While speaking, Xu Yang poked the four-star secret key out of the forbidden light ball. Suddenly, the forbidden light ball became extremely thin, as if it could dissipate at any time. Xu Yang stuck his hand into the light ball and immediately grabbed the octave crystal.

"Tsk tsk, the perfect octave crystal stone, the masters of the seven or eight tribulations of the World Honored One must be jealous..." The bronze plate reminded, "Xiao Xuanzi, you should also understand the principle that wealth is not revealed. Such treasures are more expensive than holy tools, and you cannot talk about them casually."

Xu Yang nodded and smiled, "I understand." He took out the octave crystal stone, then took out a jade box from the storage ring, and placed it with precious and valuable place.

"Okay, the treasures that should be exchanged have been replaced. Next, it's time for us to leave this underground palace." Xu Yang said.

"Slow down..." The old man with a bronze plate transformed into a illusion said to Xu Yang, "Xiao Xuanzi, there are so many treasures here, are you willing to give up?"

"I can't bear to let go. My only secret key has been used up. With my current strength, I'm afraid I have no chance of winning if I want to fight alone to pass through the other four-star black palaces. So, these treasures can only be watched." Xu Yang also felt a little regretful.

"This is not necessarily..." The bronze plate laughed and said, "The only function of the secret key is to open the banned light ball. This banned light ball may not be sure. Only through the secret key can this path be opened."

"Can you open the banned light ball through other means?" Xu Yang said in surprise, "Why didn't you say it earlier? You also asked me to choose between the ninth-level holy weapon and the octave crystal... and just take them all away."

"Well, there is no way yet, but when I recover my strength, I should have the ability to open these prohibited light balls and obtain treasures." said the bronze plate.

"Did you restore a certain amount of strength?" Xu Yang couldn't help but say disappointed, "If you want to restore your strength, you don't know what time it is. We can't wait here forever. What you said means you didn't say it."

"Xiao Xuanzi, although I can't open the banned light ball now, I will definitely be able to open the ban master in the future!" The vulgar old man transformed from the bronze plate criticized in regret, "You are so stupid! Just take away the banned light ball, isn't it all?"

"That's true!" Xu Yang couldn't help laughing. He didn't expect this simple method.

"But, these banned light balls seem to have a considerable repulsion between each other, and it is difficult to take them away at the same time." Xu Yang reached out and grabbed them. After a while, he grabbed two banned light balls one after another. These two banned light balls were like two bright stars, emitting a blazing white light. As Xu Yang said, these two banned light balls had a strong repulsive force between each other. With Xu Yang's cultivation level, they had to do their best to hold them down so that they would not push each other away.

"Just two banned light balls are so difficult. If there are more, it will probably be more troublesome. It seems that we can only settle for the second best, and only take one banned light ball and slowly dismantle it in the future." Seeing Xu Yang's difficulty, the bronze plate could only sigh. The wretched old man who transformed into a pair of eyes turned around and aimed at the ninth-level holy artifact banned light ball that Xu Yang had just given up.

"Huh? Xiao Xuanzi, here is still quite a distance from the black hole vortex, and there seems to be something below?" The bronze plate's eyes suddenly screamed as she chased the ninth-level holy weapon and looked down.

Xu Yang put aside the two forbidden light balls in his hand and looked down on the blue stone platform. Sure enough, there seemed to be a mass of things swimming below in the area closer to the black hole vortex.

After looking for a while, Xu Yang finally saw clearly that it was also a forbidden light ball, but compared with the four-star forbidden light ball, the only forbidden light ball below emitted black light! In this deep starry sky, there was a black hole vortex below, so this black light ball was naturally difficult to find. Thanks to the sharp eyes of the bronze plate, it was only then that I saw it.

"What level of prohibited light ball is that?" Xu Yang said subconsciously. He looked at the bronze plate, his heart thumped!

"In the Fifty-five White House, the lowest level is the three-star ban, which presents a golden light ball; next is the four-star ban, which presents a blazing white star shape. The closer the banned light ball to the black hole vortex, the higher the star rating! Then the black banned light ball below... must be higher than the four-star ban!" said the bronze plate.

"When I just stepped into the underground palace, I got a prompt about the secret key. The star rating of the secret key is divided into one to five levels, with the highest five stars... Could it be that the black banned light ball below contains five-star treasures?" Xu Yang said in surprise, "No, right? The No. 54 Black Palace we have entered should be the innermost and most difficult Black Palace, and what we gave was just a four-star secret key! Along the way, I have never seen a five-star secret key?"

"Silly?" said the bronze plate. "Isn't there any other synthesis key in the prompt you got? After the five four-star secret keys are synthesized, they will naturally be five-star secret keys."

Xu Yang took a chill: "So, do you have to kill five real spirit beasts in a row and take out five four-star secret keys to synthesize them so that you can obtain the highest level treasure in this underground palace?"

"Of course!" The bronze plate snorted, then muttered, "Grandma, there are ninth-level holy weapons in the four-star banned light ball... What will happen to the five-star banned light ball? The master of this underground palace, Xuanwu Supreme, is too much..."

"Above the ninth-level holy weapon, there can only be... an immortal weapon!" Xu Yang's heart beat even more intensely in his chest. With his concentration, he was inevitably excited when he heard the word "an immortal weapon".
Chapter completed!