Hua Mian's words made the national teacher raise his head, from His Majesty to the high-ranking priests, including the previous Lanqiu Fairy Princess Ye Si, there were not a few people he brought down, and almost all of them would arrive at the space where they were now to rest, but Xia Huamian was the first person to see through the secrets in the space at a glance.

"Did someone tell you something?" , Seeing that Hua Mian had concerns, the national teacher asked.

"I really didn't, I didn't know what it looked like below before I came down, but I just felt that the flow of smoke was in the wrong direction, it didn't sink but rose to a high place, if there was no external suction, it would be impossible to produce this kind of scene", Hua Mian tried not to involve too difficult to understand the explanation.

Everyone present could understand her statement, and most of the priests who were able to enter this level knew about the secret in the cave, and as the chef, they could understand that this level was indeed beyond their expectations.

"Let's go, we're still some way from the temple, we'll get there in time," the national teacher said, standing up.

The group continued down the stone steps on one side, the difference is that this time there is more to think about than before, what can continue to burn? The stone pit was burning when they entered the space just now, indicating that someone had made preparations before they came, but according to the priest, the last time they entered was two days ago.

The time of burning combined with the black smoke and that strange smell...... It's oil! Hua Mian suddenly realized that yes, it could keep burning for a long time, and the only thing that had a special smell could be oil.

I didn't expect that in this world, natural resources are quite abundant, but if it is really oil that goes straight underground and burns fire...... "it is too dangerous......"

"What's wrong with Chef Xia? Dangerous? Is there something wrong with this road? Hearing Hua Mian say 'dangerous' The national teacher who was walking ahead stopped and turned around to ask.

"No, no, no, the road is ordinary, and there is nothing strange about it"

"That being the case... What do you mean by danger? ”

"Of course, I mean oil, and the stone pit in that area just now leads to the underground, right? Light a fire on a stone pit, and you will not feel ...... Well......", how to describe it? Hua Mian didn't want to explain things too complicated, so she thought about the words.

"It won't happen as you think, the rumors about the oil are terrible, but because of the scarcity of the oil, on the one hand, the merchants will exaggerate the effect in order to raise its price, and on the other hand, ...... The people who discovered the cave made improvements at the beginning of its construction."

"The stone pit you saw just now did not reach the original depth recorded in the history books, but was dug down a lot under the guidance of General Lu to form a stone pit, which was filled with fire oil in later generations to keep the flames in the stone pit continuous."

"General Lu? Could it be Lu Yan of Shangyang City? Hua Mian was shocked, the impact of this Lu Yan on future generations was really beyond her expectations.

The national teacher nodded, "It's Lu Yan, General Lu, Chef Xia, as a chef, would know so much about General Lu's affairs."

"I don't know a lot either...... I don't know much, but I passed by a post house called Yanyang Post when I was on a mission to Beilin before, and I heard some things from the owner of the Lu Pavilion there."

"Does the Lu family have any descendants left?" , the national teacher rarely showed a surprised expression.