The underground palace, located in the deepest part of the valley, is different from the misty and immortal aura of the Heavenly Palace, but around this underground palace, there is a strong evil aura, which is so strong that Lin Yu can't help frowning.

Such a strong evil qi, as long as it is contaminated with a trace of it, it is enough to make a martial artist below the sixth-order emperor fall directly, and even if it is an ordinary sixth-order emperor powerhouse, it is difficult to forcibly resist the invasion of this evil qi.

That is, Lin Yu, and the people behind him are not ordinary martial artists, so they can not be affected by this evil qi.

"Lin Yu, before you start breaking through, I have to remind you that this underground palace is not as simple as the Heavenly Palace. ”

Seeing that Lin Yu was about to enter the underground palace, Yang Yun stepped out and said: "In the Heavenly Palace, all the opponents you face are illusionary, no matter what, they will not really kill you, but this underground palace is different!"

"This underground palace was originally a desperate place, full of terrifying evil aura, even the true god powerhouse could not easily enter, and later after the transformation and guidance of the lord of the mansion, the current underground palace was formed!"

"In the dungeon, all the creatures are formed by the condensation and transformation of evil qi, and these creatures are called evil demons!"

"Because they are transformed by evil energy, these evil demons are extremely fierce and cunning, and have a bloodthirsty instinct, even if they are internal, they will continue to fight, and if someone from the outside breaks in, it will make them crazy!"

"Although in the dungeon, there is a prohibition left by the lord of the mansion, and you only need to shout to leave and you will be teleported out, but many times, those demons will make you not even have a chance to shout out and leave!"

"Every year, many martial artists die in this underground palace, Lin Yu, although you have broken through the ninth layer of the Heavenly Palace, you still have to be more careful when you enter this underground palace!"

"I see. ”

Hearing Yang Yun's words, Lin Yu's face couldn't help but turn pale, and he bowed to Yang Yun and said, "Senior Brother Yang, thanks to your reminder." ”

In the previous token, it was only explained that the underground palace was a place to test survivability, but it was not as detailed as Yang Yun said, and Yang Yun's reminder was undoubtedly extremely important to Lin Yu.

The next moment, Lin Yu's face was solemn, and he stepped into the underground palace.

Swish!

His figure flashed, and he suddenly appeared in a vast and boundless dark world, there was no light in this world, and it was cold and evil to the extreme.

Wisps of extremely cold black smoke floated all over the world, and there were countless sharp and strange laughs, and that kind of laughter was full of gloom that penetrated into the bone marrow, making people shudder.

If you look closely, it is not black smoke at all, but countless creatures shrouded in black mist, their bodies are translucent, semi-substantial, and full of a strong evil aura, which is exactly countless evil demons!

"Boom, another human is coming!"

"Eat him, eat him! This is a great tonic, eat him!"

Sensing Lin Yu's arrival, the countless black smoke suddenly boiled, and countless demons, wrapped in the cold black smoke, directly killed Lin Yu!

"There are so many demons!"

Lin Yu's face changed slightly, just the number of demons killed at him around here had already exceeded 100,000, if it wasn't for Yang Yun reminding him before, he would have really suffered a big loss if he was caught off guard!

"Great Chaos Thunder Sword!"

Quickly regained his composure, and without thinking about it, he swung out a sword, and the fierce sword qi erupted, bursting out with infinite thunder power, pouring towards the surrounding demons!

Thunder and lightning is the most domineering power, specializing in restraining all kinds of evil spirits, and evil demons are also one of the evil spirits, and when they collide with Lin Yu's sword, it is naturally like encountering a natural enemy!

"Ahhh

"This human being has mastered the power of thunder and lightning!

Countless demons screamed bitterly, and in just a few breaths, tens of thousands of demons were directly killed by Lin Yu, and more demons were frantically escaping outward, and they directly chose to escape!

"Humph!"

Seeing this, Lin Yu snorted coldly, but he didn't catch up.

After all, he was a newcomer and didn't know much about the world, and if these demons led him into some trap, it would be him who was in danger.

"Huh?"

Just as he was about to leave, his eyes suddenly froze, and he found that the corpses of those demons he had killed had turned into a faint black mist, and those black mist quickly condensed, and in an instant, turned into a black bead the size of a mung bean.

"What is this?"

After a little induction, Lin Yu's eyebrows couldn't help but raise.

In this black bead, there is an extremely pure evil qi, although there are not many of them, but its purity is the first time Lin Yu has seen it.

This kind of pure evil qi, whether it is transformed into true yuan to absorb, or refined into weapons, enhances the power of weapons, has a great effect.

It's a pity that the evil qi contained in this black pillar is too little, and this evil qi has no effect on Lin Yu at all.

However, this is not surprising, after all, almost all of these evil demons killed by Lin Yu are under the existence of the Emperor Sealing Realm, and it is already very good to be able to produce these evil qi.

"This dungeon is not bad, in addition to the test, you can also get some additional gains. ”

Nodding, Lin Yu continued to act.

Next, he didn't kill in this first layer, after all, the demons in this layer were too weak, even if they were all killed, they wouldn't be able to produce many evil qi beads.

If you really want to get a good enough harvest, you must go deeper and kill more powerful demons!

After a few hours, Lin Yu finally found the passage to the second layer, and without the slightest hesitation, he directly entered it.

In the second layer, the number and strength of the demons have been significantly improved compared to the first layer, and there are even a small number of demons among them who have reached the existence of the Emperor Realm.

Of course, no matter how many demons of this level were, they could not pose any threat to Lin Yu, and they easily killed a large number of demons, and Lin Yu found a passage to the third layer.

And in this third layer, the strength of these demons has obviously made a qualitative leap, and almost all of them have already reached the Emperor Realm!

Some of these demons are no longer able to kill only by instinct, but have developed a certain amount of wisdom and know how to use evil qi to condense into weapons, and even a very small number of them have created quite powerful moves. Under the combined attack of hundreds of thousands of Emperor-level demons, Lin Yu's threat was suddenly greatly increased!