"He is the head of the four major evil gods worshipped by the Eighteen Tribes." Chen Qing Xu said: "Legend has it that he has four feet, four arms, two heads and two hearts, and he is in charge of disasters and famines. Wu Er Gu is greedy by nature. When he descends, earth and heaven will change, and all living beings will be swallowed up by him. He is the most frightening god from the Northern Man."

Gu Yun replied with an 'oh'; he somewhat could not understand.

"I infiltrated deep into the grasslands for half a year, but up to now, the witchcraft of the Eighteen Tribes, I could only touch the surface. Its deep history and profundity are beyond the imagination of foreigners such as those of us from far away.

“There are many witchcrafts and poisons related to their strange legends of evil gods, the most vicious one is the ‘Bone of Impurity’ — Wu Er Gu". Chen Qing Xu paused slightly. "'Four feet, four arms, two heads and two hearts', in a literal sense, what does the Marquis think this looks like?”

Gu Yun replied with hesitance: "It sounds like two people merging together."

Chen Qing Xu: "Yes, the evil god Wu Er Gu devoured his brother as soon as he was born and gained twice the amount of divine power ever since. There is an ancient witchcraft in the Eighteen Tribes which combines two brothers connected by blood into one soon after they were born, and produces a...monster that can acquire the power of the evil god, also known as ‘Bone of Impurity’.”

Gu Yun listened, he was silent for a moment, gently pressing under his ribs. Although there was the steel plate support, somehow, he could still feel needle-like pain under it.

Chen Qing Xu hurriedly said, "Marquis, your wound..."

"It is all right," Gu Yun waved his hand, licked his lips slightly, slowed down his tone and asked, "Miss Chen, I don't quite understand what it means to ‘merge two people into one’?”

Chen Qing Xu hesitated a little.

"Don't worry," Gu Yun said. “You can say it."

"I have only heard this from tales, I'm afraid it might not be accurate," Chen Qing Xu murmured. "It is to put a pair of babies under the age of one in a sealed place, not giving them any light, water, nor food.... one of the two will die from suffocation first. The dead baby will then be taken out and be refined by a secret method.”

Gu Yun thought for an instant that his medicinal effect had worn off, that his ears were deceiving him. He asked again with difficulty: "...What?"

"Refining." Chen Qing Xu emphasized on the word: "Then combined with the secret medicine of the barbarian witch as an activator, it is fed to its surviving brother bit by bit...”

Gu Yun lost his voice: "Could that child still live at this point?"