"This passage ......" Just looking at this passage in the book, Allen's heartbeat inexplicably began to accelerate.

Look at the bottom again, there is a line of small print, like a note: Empty your heart.

"If I'm not mistaken, it's the spell of some long-lost magic. Cynthia stared at him meaningfully, "For example, there is no one in this school who can teach you light elemental magic. ”

Eren was also faintly aware of this, because judging from the style and content of this passage, it was like most of the spells of elemental magic, and at least it should be contemporary.

If that's really the case......

Thinking of this, Allen's lips trembled a little with excitement, and the question that had puzzled him for a long time finally found the answer - light elemental magic exists, and his existence is meaningful.

Before he had time to think about it, Alan immediately wanted to try it and see how effective this magic was. But as soon as he opened his mouth, he realized a serious problem - there were only incantations written on it, and there were no action instructions.

Most magic requires certain action commands, regardless of the level or the strength of the effect, a certain number of action commands are required to deploy the magic power, even if it is simply an arc in the air to determine the range of a magic that can be effective.

But he stared at this page for a long time, and found that there was only this paragraph on it, and there was nothing on the second page, it was blank.

"Could it be that this magic happens to be one of the very few types that doesn't require action commands?" Alan guessed with a little trepidation.

"Anyway, let's try it first. Cynthia also found out about the problem and proposed.

"Hmm. Alan nodded, hesitated slightly, and began to chant the incantation.

After all, he was in a cave full of danger, so he didn't dare to make too much noise, nor did he dare to use too much magic power, so as not to alarm the owner here.

To his disappointment, it took a few more hours for him to finish chanting the incantation, but nothing happened.

According to his thoughts, since it is called light elemental magic, it should belong to the category of elemental magic, and it stands to reason that there will be quite obvious traces of magic, such as fire elemental magic will produce flames, and wind elemental magic will produce airflow. But nothing happened to him after the spell was over.

"Didn't it work......" Without the appearance of the imaginary light, half of Allen's excitement just now disappeared in an instant, "Or rather, this is not a spell at all......"

"I don't think so. Cynthia shook her head, "Probably something went wrong with the spell casting link." ”

"But there's no more clue to this......" Alan sighed.

"If you look at anything else, I've seen two or three other things that look like spells, and they seem to be about light elemental magic as well. ”

But as soon as she finished speaking, three more "knock knock" sounds came, and it seemed that Frey had been waiting a little anxiously.

"Uh...... The book ...... "Alan looked at Cynthia with some embarrassment, not knowing what to do.

"I'll leave it to you for now, and there's nothing I'm interested in writing on it anyway. Cynthia saw what he was thinking and said.

"Thank you. Alan carefully tucked the book into his arms, "I'll keep it safe, and I'll give it back to you as soon as I'm done." ”

The two chatted as they climbed the steps.

"Actually, I'm more interested in whether it's the same book or not. Cynthia said.

"Do you think there will be another one?" asked Allen.

"Hmm......" Cynthia frowned slightly, "although the color and cover of this book are exactly the same as the one I picked up last time, the first page of that book is not written about these, but about the magic that summons elves...... And I also briefly flipped through it, and it recorded a lot of elemental magic that I hadn't heard of, and there were several kinds of magic with fire elemental magic and thunder elemental logos alone. ”

"......It's also possible," Alan couldn't help but nod after listening to Cynthia's hypothesis, "I've heard that this book has appeared in many places on the Hepp continent, and it's thousands of miles away. If there really is more than one book, then it would explain the problem. ”

"Heh, I'll find it sooner or later. Speaking of this, Cynthia chuckled softly, and then her eyes became determined, "That's what belongs to me!"

Seeing Cynthia's cold side face, Alan couldn't help but be a little confused, it was an unquestionable, staring at his prey that made him shudder a little. It wasn't the first time he had seen Cynthia show such an expression, although his usual impression of Cynthia was to stay on the instinct and talent, but when it came to power, he found that Cynthia seemed to be a different person. I've always wanted to ask her why she's so obsessed with finding that book, or rather, so obsessed with power.

But after hesitating for a long time, he still didn't ask.

"With her character, she wouldn't have said it even if I asked......" Alan couldn't help but shake his head slightly at the thought of this.

"Don't tell him just yet. Just as he was stunned, Cynthia said again.

"Who's that?" said Allen.

"Frey. Cynthia said softly, "There are not many people in this school who can be trusted. ”

Alan was even more hesitant when he heard this, he was still thinking about whether to tell Cynthia about the last time Frey approached the book, and it might have been taken by him.

However, after thinking about it for a long time, he still gave up, and it was better not to make any extraneous problems until everything came to light, especially now that they desperately needed help. If she told Cynthia the news now, she didn't know if she would be angry with herself, and she didn't know if she would go directly to Frey's theory.

"Uh-huh......" So Alan had to whisper perfunctory.

By this time they had reached the top of the staircase. As they went up, they noticed that the ice on the steps would be much larger with each floor, until they reached the top floor, where there was hardly much more to stay. What appeared in front of them was two huge arched stone doors.

The two doors are almost ten meters high, and the outline of the doors is not very regular, just like the ground near here, and the door panels are also frozen, but the difference is that the ice on the door panels looks very thin, and there are many bulges, which at first glance look like the petals of roses.

Frey was slowly wandering in front of the door, not knowing what he was doing.

"You're slow. Frey said without looking back.

"Did you find a way to open the door?" Cynthia didn't answer him, but asked directly.

"Not yet. Frey shook his head, scrutinizing every nook and cranny of the door he could see, "Even if you find it, you don't dare to open it." ”

"Is there anything behind this?" asked Allen.

"Listen carefully. Frey motioned for him to hold his breath.

Alan did so.

"Whew...... ...... "A heavy but rhythmic sound came, like the wind blowing regularly from somewhere.

"What's the sound?" Alan was stunned.

Frey stared at the door thoughtfully, "I don't know, it's been a long time...... I've been here since I came here. ”

After saying that, he was silent again.

At this time, Cynthia seemed to have a little eyebrows: "It seems to be ...... Snoring?"

"Snorr?" was the word that made Alan want to laugh a little, but he couldn't laugh at all when he listened closely...... It's quite similar......

But as soon as Cynthia's words fell, the strange sound suddenly disappeared, replaced by an earth-shattering roar, so loud that cracks even cracked on the ice!

The three of them couldn't help but cover their ears at the same time and took a few steps back.

"What's in this door?!" Allen's heart tightened, and he actually had a trace of timidity.

But before he could think about it, the roar gradually weakened, and was replaced by a series of "dong ...... Boom...... The sound of "...... bang" is like something hitting the mountain.

Alan was stunned, he was familiar with this rhythm, as if he had heard it somewhere......

Cynthia was obviously familiar with him too, and glanced at him.

"It's ......," Alan desperately remembered the strange sounds he had heard since he entered the school, and finally remembered what old Seaphus had said.

"The devil's heartbeat!" Alan cried out.

"What?" Frey looked back at him in disbelief.

"Could it be that the devil really exists!" said Allen, who began to break out in a cold sweat.

At this moment, the thumping sound disappeared, and the sound that came from it began to become softer, and then clearer and clearer.

"They're approaching this way!" all three of them were shocked at the same time. Since both sides were covered in ice, they had to run down the stairs.

And just as they had found a corner to hide, they heard a loud bang - the door opened!

The three of them couldn't help but cover their ears at the same time and took a few steps back.

"What's in this door?!" Allen's heart tightened, and he actually had a trace of timidity.

But before he could think about it, the roar gradually weakened, and was replaced by a series of "dong ...... Boom...... The sound of "...... bang" is like something hitting the mountain.

Alan was stunned, he was familiar with this rhythm, as if he had heard it somewhere......

Cynthia was obviously familiar with him too, and glanced at him.

"It's ......," Alan desperately remembered the strange sounds he had heard since he entered the school, and finally remembered what old Seaphus had said.

"The devil's heartbeat!" Alan cried out.

"What?" Frey looked back at him in disbelief.

"Could it be that the devil really exists!" said Allen, who began to break out in a cold sweat.

At this moment, the thumping sound disappeared, and the sound that came from it began to become softer, and then clearer and clearer.

"They're approaching this way!" all three of them were shocked at the same time. Since both sides were covered in ice, they had to run down the stairs.

And just as they had found a corner to hide, they heard a loud bang - the door opened!