The rune heart seal loomed between Merlin's eyebrows, and then, from the rune heart seal, mysterious runes flew out one by one, quickly forming a complex magic circle, and pressing down fiercely towards the rune circle in the distance.

"Click".

The complex rune array was instantly broken by the rune heart seal, revealing a deep valley inside.

In the deep valley, there was a deep hole, Merlin looked at it casually, and found that this hole seemed to have been excavated, presumably by accident by the Mill family.

There must be some secret inside the cave, otherwise the Mill family would not have so solemnly hidden this cave entrance with a rune array.

"Whoosh".

Merlin didn't hesitate and walked straight inside.

The passage was dark and a little damp, Merlin held out his finger, and on his fingertips, a light white flame appeared, illuminating the passage.

As he went deeper into the passage, the two volumes of the Book of Vast in Merlin's hand fluctuated more violently, and there was no doubt that the third volume of the Book of Vast was definitely in the depths of the passage.

Therefore, Merlin was even more cautious, if the Book of Vast was in the passage, then why didn't the Mill family take the Book of Vast with them?

And if it was really the third volume of the Book of Immenseness, it was a record of a large amount of Pandora's magical energy, so why didn't the three seventh-level mages of the Mill family practice Pandora's magical energy before?

Everything of this kind is full of mystery.

As Merlin went deeper, a glimmer of light finally appeared in front of him, the light of a candle flame. Could it be that there are still people from the Mill family in it?

Merlin's spiritual power also kept an eye on everything around him, and as he walked out of the passageway, he entered an underground chamber. Candles lit up the walls around the room, but not a single caster was in sight.

And in the secret room, there are also some traces of the caster's activities, it seems that the Mill family does send people here from time to time, but there is a secret here. Worthy of the Mir family's attention?

There is only one entrance to the chamber, and it is a large stone door, and the mechanism is simple. Right next to the stone gate, when Merlin opened the stone door, he saw an amazing scene.

A terrifying aura of destruction instantly permeated the entire room. Even Merlin. At this moment, they seemed to be suffocated, and they didn't dare to take another step.

Merlin looked at a huge rune circle in front of him, like a transparent crystal, and there was a force as thick as a pillar inside, exuding a violent aura.

"The law, and the law of terrifying thunder!"

Merlin was too familiar with the law, and this aura fluctuation was exactly what he dreamed of. The law that I came to Tongtian Peak to look for, and analyzed it from the fluctuation of its breath. This is clearly a law of thunder.

At present, Merlin has the law of fire and ice, but in Tongtian Peak, there is a hidden law of thunder, due to the rage of the law of thunder, ordinary spellcasters can not say that it is difficult to even get close.

In particular, the rune circle that envelops the law of thunder is very complex, and it contains terrifying power, once it touches the rune circle slightly, it will be devastating by the rune array.

At this time, Merlin finally understood why the Mir family attached so much importance to Tongtian Peak, and even more understood why the Mir family would send someone to the secret room.

They had already discovered the laws hidden within the Tsuten Peak!

This law of thunder should be left by the mysterious owner of the Book of Vastness, and the third Book of Vastness is around the Law of Thunder, not that the people of the Mill family don't want to get the third Book of Vastness, but they can't get it at all.

Because they can't get close to the Law of Thunder at all, and they are afraid of the attack of the rune array, the Mill family has specially built such a secret room to guard this Law of Thunder, and they are also trying to find a way to get close to the Law of Thunder or get the third volume of the Book of Immense.

But it's a pity that the laws left by the great legend and the rune arrays that were personally arranged, not to mention the Mir family, which only had the three weakest seventh-level spellcasters, even those spellcaster organizations with ninth-level spellcasters might not be able to break through these rune arrays.

You must know that this rune circle is not ordinary, it is not a pure defensive array, but a rune array of defense and attack, once the rune circle is touched, then it will immediately be attacked by the rune array.

The rune circle personally arranged by the legendary mage, if it is attacked with all its might, who can guarantee that it can resist?

The Mill family discovered this law of thunder and the third book of vastness in vain, but they could do nothing about the law and the book of immenseness, they could only watch it greedily, but they could not get it.

This is also the sorrow of the weak spellcaster! There is no treasure mountain but no use of it.

"Buzz".

Merlin took a deep breath and mobilized the rune heart seal, the rune heart seal that shimmered with a faint light, and displayed every structure of this rune circle arranged by the legendary mage himself in front of Merlin's eyes.

But even so, after seeing the structure of the rune circle clearly, Merlin also gasped, this rune circle was too complicated to arrange.

It is the most complex rune circle that Merlin has encountered so far, in addition to the entire magic circle of the Dark Spirit Domain, the rune circle of the Dark Spirit Domain was arranged by Archmage Fidel, I don't know how much effort Lu Dao has spent.

Archmage Fidel has almost reached the pinnacle of attainment in rune literature, otherwise it would be impossible to condense such a magical treasure as the rune heart seal.

With the rune heart seal, Merlin was able to go from being ignorant of runes to now being able to arrange and crack some advanced and complex Fu text arrays, all relying on the power of the rune heart seal.

The rune circle in front of me is the same, although it is too complicated, it is not impossible to crack, it just takes a long time.

There is a rune heart seal, Merlin doesn't believe it, there is any rune law that really can't be solved. However, Merlin still has one more worry, if the rune magic circle is unlocked and the law of thunder erupts, how can that terrifying power be resisted?

The last time Merlin suppressed the Law of Ice, he relied on the Matrix Number to derive spells. The Law of Ice was quickly consumed, and then the Law of Fire was able to suppress the Law of Ice.

Now, though, Merlin's Eyes of Darkness. It must be suppressed by the power of the law, and in this way, the power of the law will be consumed almost every moment, and Merlin must have a large number of laws.

This law of thunder is very huge, and Merlin doesn't want to consume it all. None of the fourth form of the Eye of Darkness can be suppressed.

"Huh".

Merlin took out the first and second volumes of the Book of Immense, and now the two Books of Immense had changed so violently that they couldn't even resist flying out of Merlin's hand.

Merlin muttered for a moment. Then simply go with the flow and see what changes will occur when these three vast books are combined.

"Whoosh".

Merlin did not suppress these two books of immensity anymore, but allowed them to fly out.

The two vast books quickly flew outside the rune circle. Subsequently. It seemed that it was blocked by the rune circle and could not fly in, and in the rune array, the third book of immensity next to the law of thunder also obviously sensed the two books of immenseness, and it actually emitted a rich light, and quickly flew towards the two books of immenseness.

This third Book of Immensity is very different from the first two Books of Immense, exuding a mysterious and powerful aura on it, like a powerful spellcaster.

The rune circle did not stop the third book of vastness. It was actually directly passed through the rune array, and quickly entangled with Merlin's two vast books.

In mid-air in the Chamber of Secrets. In the dazzling light, the three books of immensity slowly merged, and it was mentioned in the book of immensity that only when the three books of immensity were fused could the law be found.

Then, after the fusion of these three vast books, it should be closely related to this law of thunder, and Merlin also faintly looked forward to it.

Time passed little by little, about an hour passed, and finally, the light on the three volumes of the Book of Vast Light gradually dissipated, and in mid-air, the Book of Vast Wealth reappeared.

However, at this time, the Book of Vast has completely changed, and only one Book of Vast is left, which exudes a golden light, and on it, mysterious runes faintly appear.

"Buzz".

The runes on the Book of Vast Heaven were entangled with this extremely complex rune array, and then, this complex rune array actually began to gradually dissipate.

This surprised Merlin, it turned out that after the fusion of these three vast books, it still had such an effect, but he didn't need to use the power of the rune heart seal to take the trouble to crack this complex rune array.

With the collapse of the rune array, the violent aura of the Thunder Law reverberated in the entire secret room unscrupulously, and even Merlin seemed to be in the midst of the monstrous waves, looking quite small and helpless.

Merlin barely supported it, and then gritted his teeth violently, and grabbed the Book of Vast in mid-air into his hand, and the moment he grabbed the Book of Vast in his hand, Merlin felt that the terrifying and violent aura of the Law of Thunder seemed to be absorbed by the Book of Vast Things, and Merlin would not be affected by any impact at all.

Moreover, on the Book of Immenseness, there is a strange force faintly, which is connected to the law of thunder, allowing Merlin to easily approach the law of thunder.

"Holding three volumes of the Book of Immenseness, you can absorb the Law of Thunder!"

On the cover of the Book of Immenseness, small golden letters suddenly flashed, all written in the ancient Morta script, which should have been left by the mysterious legendary mage.

"The Book of Expanse, it turns out that if you want to absorb the law, you have to rely on the Book of Immense!"

Merlin's eyes lit up, and now he realized how important these three vast books were, otherwise, even if he found the Law of Thunder alone, he would be helpless against the Law of Thunder and the Rune Law Circle just like the people of the Mill family.

This law of thunder, unlike the law of ice, is designed to be absorbed by people, as long as you hold three volumes of the vast book, you can easily absorb this law.

Merlin took a deep breath, calmed his excited mind slightly, tightly grasped the golden Book of Vast Wealth in his hand, and began to slowly approach the law of thunder that exuded a violent aura.

[Fortunately, I didn't disgrace my life, I finished two chapters, I was so tired, and I went to sleep...... Good night everyone!] (To be continued......)