Yun Huanxin didn't detect anyone either. She said, "Maybe they're suffering from the profound beast tide somewhere.  If we want to know, we need to go to the city."

Yun Lintian looked around for a moment, then shook his head. "Forget it. Our purpose here is to find profound beast's meat. But I wonder if it could be eaten."

He didn't want to take risks after discovering the strange black energy within the profound beast. It might be the same as the wilted crop that could harm people after consuming. 

"We will find a secluded place first. I need to enter the Land of Beyond Heaven to check with Lynn." Yun Lintian made a decision.

Both of them traveled for hours before arriving at a three-meter-wide river with a waterfall falling from a small hill. Yun Lintian quickly decided to make this place his base as profound beasts would definitely come to drink water, and he could use this chance to kill them.

"Please help me make a cave behind the waterfall. I will lay a formation around here first." Yun Lintian told Yun Huanxin and started inscribing ancient runes on the formation stones he brought out. While Yun Huanxin used her sword to open a cave behind the waterfall's curtain.

An hour later, Yun Lintian had entirely laid a ruler-level killing formation with an alarm formation covering two hundred square meters. With this, even the Ruler Profound practitioner wouldn't be a threat to Yun Lintian.

"We will go back first. It's time to transform your Profound Vein now." Yun Lintian said and brought Yun Huanxin to the cave before he activated a high-level conceal formation and entered the Land of Beyond Heaven with her.

"Are you sure? I would take a long time to regain my power." Yun Huanxin asked worriedly. Without her power, Yun Lintian might not be able to travel or escape when facing a powerful enemy.

Yun Lintian firmly said, "I can't delay you further. When you start practicing a new profound art, your strength would be increased by leaps and bounds. At that time, even facing a saint would be no problem, and this is the right time to do it. After all, I will stay in the place for a long time until I reach the Spirit Profound Realm."

Yun Huanxin said nothing further and calmly accepted Yun Lintian's transformation power. Thirty minutes later, her Profound Vein had wholly transformed, and she immediately understood how powerful it was.

Yun Lintian took a deep breath to recover his mental strength before he said, "Go to the Library and pick the Void God Secret Art to practice. I think it is the most powerful space-related profound art."

Yun Huanxin nodded and walked toward the Library.

After sending Yun Huanxin away, Yun Lintian went to the villa's basement and skillfully laid an isolation formation before taking out the Stone Rhino's heart and placing it on a long table.

"Lynn, have you detected the black energy within this." Yun Lintian asked.

Lynn immediately replied, "Master, I cannot detect it."

Just as Yun Lintian was disappointed, Lynn said further, "But listening to Master's explanation, I found a piece of information that might be related to it. Master can take a look at this book."

Yun Lintian turned to the screen on the wall and saw the book called 'The Record of Abyssal Energy' on it.

"Abyssal Energy?" Yun Lintian was puzzled. He didn't linger further and quickly retrieved the book before returning to the basement and started reading. 

Page by page, Yun Lintian skimmed through it and found interesting information. The Abyssal Energy was born from the creature called 'Abyssal Overlord' who reigned supreme in the Abyssal Word. This Abyssal Energy could cause a negative impact on one's mind. It could make people or profound beasts enter the frenzy state and ultimately lost their consciousness.

Yun Lintian was stunned upon reading this because he seemed to recall something. The Blazing Sun Monarch, Yan Qi, had told him before about the incident four thousand years ago. It was said at that time there were countless profound beasts appeared in the Azure World. Their skins were dark as ink, and they would emit a deadly poison aura. Later, these Profound Beasts had become the Poison Valley.

Could it be this is genuinely the Poison Valley's deeds? Then… Do they come from the Abyssal World? Yun Lintian thought. He suddenly felt as though he just discovered the truth behind the incident four thousand years ago. However, everything was merely his own guess for now. He did not have evidence to prove it. 

Yun Lintian hurriedly flipped through the book to find the Abyssal Overlord and the Abyssal World information. Unfortunately, there was no further detail regarding the Abyssal World or the Abyssal Overlord within the book.

"Lynn, is there any book related to this Abyssal World?" Yun Lintian asked.

"This is the only book, Master." Lynn replied.

Yun Lintian frowned and was slightly agitated. He hated this feeling when he was about to figure something, but he lacked information in the end.

Since he couldn't do anything at the moment, Yun Lintian continued to read the Abyssal Energy's information.

"So that's how it is." Yun Lintian muttered to himself. He had figured out how to deal with the Abyssal Energy after reading for a full hour.

Yun Lintian couldn't help smiling because the cure of this Abyssal Energy was actually the highest-quality Profound Spirit Liquid… And he happened to have the entire lake with him!

"What a coincidence. My plot armor is too strong." Yun Lintian exclaimed delightfully. At first, he was worried whether he could eat the meat of these Profound Beasts as they were infected with Abyssal Energy. However, with the Profound Spirit Liquid, the Abyssal Energy was not a threat to him anymore.

Yun Lintian didn't wait further and quickly went to retrieve a bucket of Profound Spirit Liquid. He then cut the Stone Rhino's heart open and soaked it in the bucket while activating the Eyes of Heaven.