When Yang Song walked to the other side, what came into his view was nothing but darkness. But Yang Song could still see clearly and easily.

A few meters away from Yang Song was a passage led to the underground.

Without any hesitation, Yang Song entered the passage. The steps were made of stone, but Yang Song felt a bit sticky when walking.

The passage was only big enough for a person to enter, and if a normal person were to come here, he would feel suffocated without fail. As Yang Song went down farther and farther, he felt that the air was lacking. Fortunately, it was not a problem for Yang Song, a cultivator.

Over ten minutes later, Yang Song came to an underground room with a stone door blocking in the front.

Yang Song moved his finger and flicked out the True Energy slightly.

Rumble…

The stone door was forced to open immediately as if a strong force was pushing it. Then, what came into Yang Song's view really made him stunned.

The space inside the room actually resembled an underground cave. But this room looked really spacious. Yang Song estimated that it could accommodate hundreds of people.

However, although it resembled a cave, the ground did not have any bumpy or rocky areas. The ground was actually a flat concrete ground.

But the things in this room were really unbearable for one to observe.

Yang Song walked inside the inspected everything.

The first thing that caught Yang Song's eyes the most was a long table on the right next to the wall that had numerous human skulls presented on it.

Next to that long table was an ancient-styled well and the unbearable smell and aura came exactly out of that well.

Walking over, Yang Song stretched his neck and looked into the well. The scene inside the well hit Yang Song's eyes instantly.

"What a sin is this…"

Deep inside the well, Yang Song spotted so many human organs as well as dried baby corpses. The atmosphere inside the well was technically bright in Yang Song's eyes, but it was actually not so.

The negative energy that had accumulated inside this well was so dense that it was on the verge of transforming into substance.

"The underground of this White Dragon Temple is completely a place of evil and sins. What in the world did that Xuan Kong do with it?" Yang Song could not help sighing out his words.

After staying silent for a few seconds, Yang Song took out a talisman paper and thought of a talisman in his mind – Purification Talisman.

The Purification Talisman could purify the negative energy as well as resentments of the dead.

"Fortunately, this is not a cultivation world, otherwise, I'm afraid that this temple would've become a forbidden zone where ghosts and evil spirits run rampant long ago."

Since there was no ghost and evil spirit, then it was easy to say because the Purification Talisman did not work on ghosts at all. And to purify ghosts and evil spirits and let them go into reincarnation, Yang Song would need a higher rank talisman which was not available for him yet.

A few minutes later, Yang Song finished drawing all the Purification Talismans. Then, Yang Song dropped the Purification Talismans into the well and used his True Energy to activate them from above.

Pure golden light shone from the three Purification Talismans and the golden light covered the entire well gently.

The black energy that only a cultivator like Yang Song could see began to revolve around the sources of the golden light before it was sucked in at a speed visible to the naked eyes.

All the black and negative energy was soon absorbed by the three Purification Talismans. Immediately, the golden light began to retreat and force itself into the three talismans. However, the three talismans still emitted a golden glow.

Shizz…

Shizz…

Shizz…

The three Purification Talismans soon let out a soft puffing sound as they release another type of energy, and the new type of energy was nothing else but pure Spiritual Energy.

After the source of the unbearable smell had gone, the unbearable smell itself had also vanished from the atmosphere. However, the real stinky smell that came from the corpses was still lingering.

Yang Song took out a few more Corpse Melting Talismans and Cleansing Talismans and cleaned up all the corpses inside the well quickly.

With this, the air inside this secret underground room turned back into normal and the gloomy atmosphere generated by the negative energy earlier had also perished away. With Spiritual Energy spreading down here, the air even emitted a slightly comfortable sensation at that.

After solving this, Yang Song walked to the long table that had numerous human skulls presented on it. These human skulls did not have any negative energy around them, they were completely normal.

Yang Song extended out his hand and picked up one human skull. To Yang Song's surprise, the human skull in his hand was tougher than normal.

"This is… a martial artist's skull," Yang Song muttered and looked at other skulls. Yang Song put down the one in his hand and proceeded to test other skulls.

The result was, without exception, every skull was tougher than the normal human skull, every skull was the skull of a martial artist. However, judging from their durability, Yang Song guessed that most of them were Warrior martial artists, and only a few were Master martial artists.

"What did Xuan Kong did with so many martial artists' skulls? Why did he kill them?" Yang Song took a deep breath and whispered.

Yang Song's attention was then caught by a modern and big safe box that stayed next to the long table.

Yang Song did not bother to find the code to unlock the safe box but he used his strength to tear the door of the safe box off directly.

Even if it was a safe box designed to defend against martial artists, it was still useless in the face of a strong cultivator like Yang Song.

Throwing away the torn door of the safe box, Yang Song took out the only chest inside the safe box and put it on the table.

The chest also had a lock on it but it was useless. Yang Song thought that the owner must have done this just to feel safe only.

But as soon as Yang Song pulled away the lock and opened the chest, five shiny silver needles unexpectedly dashed out like lightning and shot at Yang Song's body.

Yang Song generated his True Energy and blocked the five needles easily. When the five needles fell to the ground, the concrete floor actually melted.

"What a vicious poison!" Yang Song shook his head slightly. Then, ignoring the silver needles, Yang Song took a look at the book with an ancient style title written in ancient C Language characters that was sleeping inside the chest – Yin Yang Devil Art.

"Yin Yang Devil Art?" Yang Song had learned a lot about ancient characters but he had heard of this kind of martial technique for the first time.

From the appearance of the book, it should be an ancient book. Yang Song picked up the book and opened the first page, which was the introduction page written with a writing brush.

The first page described the creator of this technique himself. But Yang Song noted the name of the creator of this technique, he was called "Kong Liu", and this Kong Liu person was actually the first abbot of this White Dragon Temple which surprised Yang Song.

Yang Song flipped through the book for a while before he got the gist of this Yin Yang Devil Art.

This Yin Yang Devil Art was actually subtracted from a dharma sutra called "Dharma of Yin and Yang" and it combined with another martial technique called "Yin Yang Martial Art", which Yang Song had heard of before.

As far as Yang Song knew, Yin Yang Martial Art was a top-level technique exclusive to a Grandmaster powerhouse among the seven Grandmasters. As to why Yang Song knew this, simple, because that Grandmaster expert shared a part of the Yin Yang Martial Art to the outside world. And most martial artists had heard of Yin Yang Martial Art.

However, that part of the Yin Yang Martial Art could only be practiced by the 6th Tier Master martial artists and above. From this, one could see its high requirement for talent and insight as well as experience of a martial artist in order to practice that technique.

As for the "Dharma of Yin and Yang Sutra", it was a sutra that talked about the course of the world, the right and wrong, black and white, up and down, Yin and Yang, and so on. But overall, it explained in the way of Buddhism and the content of this sutra portrayed the white as good and black as evil. In addition, it also explained how to turn from evil to good.

The Yin Yang Devil Art was a martial technique that had a principle that was in complete contrast with the Dharma of Yin and Yang Sutra. It was a technique that… turned one from good to evil.