What is it? Fifth Fei shook his head suspiciously, and then cast an inquiring glance at Luo An'an.

"This is the coal used by mortals to heat their fires. Luo An'an gave an answer.

"What?" Fifth Fei was shocked by this answer: "No, I've heard that mortals burn wood into charcoal, but I haven't heard that it uses such a black thing." ”

"Then you know less. An Baobao fooled her without any heart: "Many mortals (on the earth) use this coal, it is much better than charcoal or something." ”

The oily black and shiny bone charcoal in his hand reflected a faint light in the faint light, and the fifth non-suspicious looked at the bone charcoal: "Coal?

"No, no, no. A certain wagging finger said: "Coal is usually formed by plants buried in the ground very long ago, and this is a miraculous process. This bone in your hand is probably formed in this way, which is unusual. ”

Isn't it unusual? An Baobao thought to herself: Once the coal on the earth was formed by plants, she didn't expect that the animal corpses in the immortal cultivation world could also be turned into coal, and she thought that the animal corpses would eventually turn into oil!

However, there is also oil hidden deep in the underground where there is usually coal, hehehe, it seems that she can make a fortune.

"But what does this have to do with the miasma?" Fifth Fei was still puzzled: "Is it also related to this coal?"

"Naturally, where coal is formed, there are also a variety of unpleasant gases (such as carbon dioxide, carbon monoxide, nitrogen dioxide, sulfides, etc.), and it is probably these gases that leak out, which forms miasma. ”

"These miasma are everywhere, invisible in the air. It's no wonder that those monks who use spiritual power tend to die faster, because whenever they absorb spiritual energy to cultivate, they will inevitably absorb those miasma together, and after cultivating for a long time, they will inevitably be poisoned. ”

Uh-huh, that's about it. However, the world of cultivating immortals is different from the earth, and it is estimated that the things generated here are also strange, and this baby can only think of so much~

"So that's it!"

The fifth non was shocked and sighed, and when he went to see An Baobao again, his eyes had changed from admiration to worship.

"The benefactor is really experienced and knowledgeable, and the concubine is ashamed of herself. Fifth Fei blinked at Luo An'an: "If it were me, I was afraid that I wouldn't be able to reveal the secret of this miasma even if I wanted to break my head." ”

A certain gray and humble said: "Where, where, I'm just talking casually." "Quack, quack, this is something that everyone who has experienced nine years of compulsory education knows!

"That'...... What do you think the benefactor should do with this change?"

Speaking of this, Luo An'an's smile suddenly faded: "This is not something you and I have to worry about. Now that you know that the chains can't trap me, you should guess that I've already reported this to the Heavenly Gate. When the people of the Heavenly Gate Sect come here, they will be handed over to them. ”

The people of the Tianmen Sect will help me, my uncle, take care of this place, and the baby now just wants to go to the ghost world as soon as possible and cure my dear shovel officer~

Seeing this, the fifth non did not say more: "Since the secret has been solved, let's go back to the benefactor." ”

"Hmm. ”

On the way back, Luo An'an inadvertently mentioned the "heirloom" that Fifth Fei gave him: "Fifth Fei, that box is not yours, right?"

"The benefactor guessed right, I got the box from the beast of Wuhou. ”