"You people are hell-bent on death, so don't blame me. Merlin sneered, and Princess Feilu carried Merlin and soon landed beside Fan Xiaopang and Black Pupil.

"Are you two familiar with each other? Merlin saw that the black pupils were far away from Fan Xiaopang, behind Fan Xiaopang was a pitch-black hole, the hole was more than a foot tall, and the width was about three or four people who could pass side by side.

"At first, the two of us almost fought, but if it weren't for the fact that this panther repeatedly backed down and pointed in your direction with his paws, I would have understood that this panther must have something to do with you. Fan Xiaopang said embarrassedly.

"Strange, how could Fan Xiaopang not think that he was a black pupil? I have told him so many times about black pupils. Merlin asked in confusion.

"These guys chased after them so quickly, after we entered, even if we closed the stone door, if this secret door didn't have a mechanism killing array, I'm afraid this secret door wouldn't be able to resist for long. Fan Xiaopang looked at the thousands of soldiers who were getting closer and closer to them, and said with a solemn face.

"Haha, don't worry, the mountain people have their own tricks, let's go in first. Merlin laughed, so he introduced Fan Xiaopang to Heitong for a brief acquaintance, and then everyone, under the leadership of Fan Xiaopang, crossed the threshold of the secret door and entered the secret door.

Looking at the soldiers who were rapidly approaching them, Fan Xiaopang said, "This stone door is very thick, I have found the mechanism to close this secret door, and it will take a lot of time for them to destroy the stone gate." Fan Xiaopang said that he was about to reach out and touch the mechanism, but was stopped by Merlin at once.

"What's the matter, it's not closed yet, it's too late to wait. Fan Xiaopang looked at Merlin in surprise and said.

"Wait a minute, I've got a way to get rid of these guys, and when I say close, you can touch the mechanism right away. Merlin said, feeling for a black flint the size of a walnut.

"Well, I'm sure you're definitely not going to joke with our lives. Fan Xiaopang said helplessly, not only him, but Princess Feilu and Heitong were also extremely curious about Merlin.

"Look, these guys have opened a passageway. One of the soldiers who was rushing towards Merlin shouted in surprise.

"Haha, look at their stupidity, actually staying there and watching us, and not closing the door, are they stupid to be scared by us. The tone of a Jin soldier was full of mockery.

"These guys who are dying are trying to surrender?"

"But even if they surrender, it's a dead end now, haha......"

These ridicules and ridicule immediately reached Merlin's ears, and he smiled evilly, "Ben Shuai suddenly felt that these guys were so sad, and death was about to befall them, but they didn't know it. ”

Merlin said, throwing the black flint in his hand hard, and slammed into a large bluestone that was more than a person high, instantly stirring up a bright spark.

The spark ignited the intense hydrogen gas in the air.

"Close the door. Merlin hurriedly called, and Fan Xiaopang, who had been waiting for a long time, immediately activated the mechanism, and the heavy black stone door immediately descended from the top, during which everyone looked through the hole that had not yet been closed.

I saw that there was already a sea of fire in the air outside the cave, and the huge sea of fire was rapidly sweeping towards the empty and vast place, accompanied by the frightened screams outside the cave, the fierce fire rushed towards their cave entrance like a fierce flood beast, but it was closed by the heavy stone door first, blocking the fire.

"Let's go, we need to stay away from this stone gate," Merlin called, and ran with everyone towards the passageway, until they were far from the stone gate before stopping.

"Oh my God, Merlin, how the hell did you, you lit the air with flint, it's incredible. After stopping, Princess Feilu finally couldn't contain the excitement in her heart.

"Yes, I don't know how many thaumaturgy I've seen in my life, but it's the first time I've seen such a situation, can you tell me about it?" Even Fan Xiaopang, who had become mature and stable after entering the Imperial Tomb, asked.

The same curious black pupil also let out a low roar, his eyes full of curiosity.

"What do you say? Merlin paused and said, "The top of that altar is made of thunder stones, and the thunder and lightning stored by this thunder stone belong to direct current, and the water in the lake is composed of hydrogen and oxygen, and when the current enters the lake through metal, the hydrogen and oxygen atoms in the lake water will separate, forming hydrogen and oxygen." ”

"And the air in the emperor's tomb here is relatively turbid, a large amount of hydrogen in such a closed space, may explode, of course, because the space outside the cave is too big, it will not explode, but hydrogen is indeed very easy to burn, the electrolysis of water will produce a large amount of oxygen, hydrogen is more easy to burn in an oxygen-rich environment, as long as a little spark will turn the entire space we are just in into a sea of fire, but although the space is large, it is impermeable, a large amount of heat can not be dissipated, and the rapidly growing energy will explode to a certain extent。 ”

Merlin said, stopped, and saw that everyone was looking at him with confused faces, with puzzled expressions, "Do you understand? This is too simple." ”

"I didn't understand, I don't know what you're talking about?" Princess Feilu said helplessly, waving her hand.

Merlin patted his head and said in his heart: "Damn, I actually regarded you as modern people on the earth all of a sudden." ”

So he had to smile awkwardly, "Haha, you don't understand, it's normal, after all, it's just a method of making fire used by the rituals in my hometown." ”

At the same time, in the space outside the thick secret door, as Merlin said, there was already a sea of fire, and the entire space was wrapped in a red flame.

The lakes on the ground have long been burned dry, the ground has melted, thousands of soldiers have long been wiped out in the fire, even the altar has turned into a pair of wasteland, the thunder stones have been shattered into slag, and occasionally a glimmer of lightning comes out.

Suddenly, the energy of the entire space had risen to the extreme, and finally exploded, and in order to get bigger and bigger.

In the dark passage, Merlin and the others hid in a corner, they had already heard the sound outside the cave, and suddenly an earth-shattering noise came, followed by a super high heat wave, if they hadn't hid around the corner, I'm afraid they would have been scorched by now.

"This power is really big for his grandmother, and this secret door has been blown through. Merlin cursed, and Princess Feilu hid behind him, who had been turned into a black man by the billowing black smoke.