Ye Yuxuan rummaged through the dead wizard, and did not find the key he wanted or anything else that looked like it could open the door, only some herbs, raw materials, metal blocks, and crystals of unknown purpose.

The trio then tried to bring the wizard to the gate to see if the gate he had set up would react to its owner, such as recognizing a face or something else that could be used to verify his identity.

Unfortunately, the carved door, which looks like a vase, is actually quite sturdy.

In fact, they were right, the door could indeed be opened automatically by sensing the arrival of its master, but it would take someone alive. Because in the delicate internal structure of this door, there is a magic circle used to sense spiritual fluctuations, but at this moment, the wizard has died, and the soul has also dissipated, so naturally it is impossible to open the door. And this is part of the wizard's plan.

"Cut, I forgot to ask this guy why he opened the door......" Su Mu increased his forehead with his hand.

When Ye Yuxuan heard this, he shrugged his shoulders: "Who told this guy to die too quickly, and there is so much nonsense?" I didn't finish asking what I should have asked......"

"It's just that your interrogation isn't efficient enough." Yui Uesugi rolled her eyes widely.

Ye Yuxuan glanced at the girl beside him, and said in his heart Who wanted to shoot the wizard right away just now......

After some unsuccessful attempts, Ye Yuxuan turned his attention back to the personal belongings that the wizard had scavenged.

He didn't know any of these things, even those herbs, which were not recorded in the database in his mind, and should be the result of cultivating them with magic side technology.

Metal blocks are all alchemical products, including light metals that are extremely light and tough; Heavy alloys, such as heavy alloys that are extremely hard but also extremely dense, are judged by their color, and the predecessors of these two metals are probably ordinary iron and copper. Being able to change their magic into this way is also the terrifying thing about alchemy, a technology that directly changes the properties of matter.

However, what Ye Yuxuan cared about the most was those crystals that emitted a white light, and he always felt that these things contained huge energy. And when he held them in his hands, the feeling became even more apparent.

Seem...... You can blow the door open, as long as it stimulates the energy inside.

Su Mu looked at Ye Yuxuan, who was holding the crystal and falling into contemplation, feeling a little strange. In his opinion, it was just a few stones that glowed periodically, like an extra-large breathing lamp, and there was nothing special about it.

"Hey, leaves, what's the fuss?" Su Mu stretched out his hand and shook it in front of Ye Yuxuan's eyes.

"I'm wondering if I'll be able to blow that door open with this thing." Ye Yuxuan threw the white crystal in his palm and said solemnly: "I can feel that there is quite a considerable amount of energy contained in it, but if the stimulation given is not enough, it seems that there is no way to stimulate this energy." ”

"Feelings? What is the sensory method? Except for emitting light, I think it's just a very ordinary crystal......" Su Mu looked a little confused.

"I don't know, that's what I think." Ye Zi shrugged helplessly, "And when I held this crystal, I was even more sure." I think it's necessary to see if I can use this thing. ”

"That thing is a Reservoir Crystal." Yui Uesugi, who was watching coldly, said suddenly.

"You know these things?" Ye Yuxuan immediately surrendered his hopeful gaze to Yui.

"Hmm...... Although I wish I hadn't known these things......" This seemed to cause some bad memories for Yui, and after a long sigh, Yui began to explain the nature of the thing to Yeko: "It's a common thing used by wizards to store magic in case of emergency, and its value is relatively precious. This thing can store a lot of energy even in a small piece, and its properties are relatively stable, but it is not very resistant to high temperatures and shocks. ”

After speaking, Yui paused slightly, and complained in a speechless tone: "It stands to reason that even a high-level wizard should only bring one piece, but this guy actually has such a bunch of things, should it be said that the system generates the commission, or is it deliberately reducing the difficulty......

In any case, such a feasible method is in front of him, and it is impossible for Ye Yuxuan not to try it. He piled all five Magic Reservoir Crystals of different sizes together at the joints of the two door panels of the gate, and used the dirt rolled up nearby to build a low U-shaped simple earthen wall to channel the blasting blaster, although it didn't seem to have much effect......

In addition, after understanding Ye Zi's intentions, Su Mu immediately dismantled the tails of the dozen or so bullets, took out the high-energy explosives filled inside, and evenly scattered them around the outermost crystal, and on the periphery of the explosives, Ye Yuxuan built an additional small earthen wall to prevent the impact from being too dispersed.

Yui Uesugi, who has much more experience in all aspects, saw at a glance the shortcomings of this improvised explosive device: without a detonator and a lead, it would be very difficult and dangerous to detonate, so she used a small amount of explosives to pull out a slender gunpowder lead, so that the improvised assembly of the improvised device could be regarded as truly completed.

"Alright, it's almost time to light it and test the effect." Ye Zi walked to the end of the lead with satisfaction, but when he turned around, he saw that Yui and Su Mu had already hidden far away at the end of the other end of the corridor: "Hey, I said what about you......"

"Of course," it wasn't his good friend Su Mu who answered him, but a shirt-tied Yui with a serious face, "Before it is released, the energy contained in the crystal is unknown, and it can only be roughly estimated according to its size and the strength of its light. And those, apparently, are in a state of fullness. ”

When Yui said this, Ye Zi himself began to feel a little hairy, if he hadn't come up with this idea himself, he would have thought it was a completely bad idea at this time, especially since this was a man-made building in the ground.

Leaf took out the match from the pocket of his training coat, struck one, and threw it at the end of the "lead" used for detonation.

And then...... Turn around and run......

It's not that he doesn't want to be like the male protagonist in the movie, slowly turn around and walk away, never looking at the fire of the explosion to play handsome...... But he didn't dare, the gunpowder fuse left by Yui was too short, and it would soon burn to the crystal, and the power of the explosion was unknown.

Just as he was about to run to the safety zone, a loud "boom" sounded, and Ye Yuxuan felt that everything in front of him was occupied by white light.

MD, I've never been handsome. He cursed in his heart.