"The Eternal City is down there......", sitting in the unicorn's carriage, Lin Chen and the three of them quickly arrived at the location of the Eternal City, pointing to the mountain below, Midalen spoke.

For countless years, the Eternal City has been there, everyone knows this, but the Eternal City, which has long been closed, has never been opened.

After all, even the heavenly punishment of the year was able to block the outside in the end, which shows how powerful this Eternal City is, but it has been closed for nearly 100,000 years, and no one knows the situation inside.

"The Eternal City!?" , Looking at the stretching mountains below, Lin Chen and Qiao Anke are both suspicious gods, don't you know the city? How can you look at the past and see that everything is just a mountain?

Looking at the appearance of Lin Chen and Joanke, Midalen obviously guessed what they were thinking, and without waiting for them to ask, he took the initiative to explain, and said: "Originally, the Eternal City was in this place, but in 100,000 years, the vicissitudes of the sea, the entire city has been buried in the mountain due to the natural factors of the earthquake, and there is only a passage to the cave below, which leads to the entrance to the Eternal City."

"Oh, so that's the case", hearing Midalen's words, Lin Chen nodded suddenly, and as he spoke, the three of them all landed from the carriage.

As for the unicorn of the Eight Grades of the Sanctuary? Naturally, he obediently stayed in the mountains next to him, this unicorn of strength, his wisdom is almost not bad, he naturally knows what he should do, and the four unicorns of the Eight Grades of the Holy Domain are together, I believe there will be no danger.

Following Midalen's back, Lin Chen and the others hurriedly walked towards the entrance of the Eternal City, although it was said that the Eternal City was a very ancient existence, and everyone knew its location, but unfortunately, the person who really had the ability to open it never appeared.

Because if you want to open the Holy Land of the Foundry in the Ancient Period, you only need the ability of the Foundry, and it must be a very powerful Foundry, even the Supreme-level Dries, after countless years of painstaking research, plus he himself has the ability of the Supreme-level Foundry, so he found a way to open the Eternal City.

The three of them hurried towards the Eternal City, and soon, they reached the bottom of the cave, but, looking at the huge gate of confinement, Midalen's brows furrowed tightly, didn't the letter say that he had found a way to come to the Eternal City? Is this door so closed? Could it be? He is still preparing somewhere now, did not come?

"Dries is already in! But this door! It should be automatically closed! Just when Midalen was suspicious, Lin Chen squatted down, and then spoke, and when he heard Lin Chen's words, Midalen and Joanke both looked to the ground.

Sure enough, although this rusty, time-corroded gate, is still closed, but on the ground of this cave, there is a clear trace, from the traces, it is obvious that it was left when the gate was opened, and after looking at it this way, Dries really entered the Eternal City.

"But what now that the door is closed?" , although he said that he knew that Dries had entered, but the gates of the Eternal City were closed, what could be done?

Although Lin Chen is also a supreme-level caster, this Eternal City is here, but no one has been able to open it for thousands of years, just rely on Lin Chen? Can it be opened so easily? Isn't Drees, who is also a supreme-level foundry, also researched for many years to find a way to open the door?

"This gate, if you want to open it, it's a little troublesome......", after looking at the traces of the opening of the door on the ground, Lin Chen naturally saw the groove on the door again, looking at the pattern in the groove, Lin Chen said with a frown.

"Is it just a little troublesome? This gate, but no one has been able to open it for nearly 100,000 years, and legend has it that there have been several supreme-level foundries in our God Realm before, but all of them have been trapped by this gate", hearing Lin Chen's words, Midalen next to him shook his head and said.

However, as he spoke, there was also a burst of embarrassment, the previous supreme casters in the God Realm were all stumped by this gate, but Dries opened it, which shows that Dries's casting technique is indeed very powerful, at least surpassing the supreme casters who appeared in the God Realm before.

Lin Chen didn't say much about Midalen's words, just looked at the huge door seriously, as well as the grooves, following these textures and magic circles, Lin Chen was secretly deducing the method of opening this door.

Although the groove on the door is the keyhole that opens the door, it is not mainly to cast a thing that is just put in, the shape is not difficult, the difficulty is how to use the key to completely activate all the magic circles on the door, which is important.

If you have to compare it, it can only be said that this gate is like a math problem, and Lin Chen is now starting to solve him.

The problem of this gate is very profound, and it can even be said to be the embodiment of the concept of foundry, even if it is a supreme-level caster, he has to scratch his ears and cheeks in front of this gate, and he can't find a clue.

Staring at the gate seriously, Lin Chen was quickly deducing in his mind, it was not difficult to cast a key, the difficulty was how to analyze the answer to the casting on this gate.

Just inside the keyhole that is only the size of a palm, the tens of millions of magic arrays on this gate are completely activated, large and small, interlocking, and this almost involves the principle of compression and overlapping of casting magic arrays.

It's like a square, if you draw a line diagonally, the square will become two triangles, but what about drawing lines on both diagonal sides? Is it exactly four triangles that have been doubled? No, but eight, the principle of compression and overlapping of the magic array, which is almost the same as this principle, uses some similarities in the magic array to overlap.

Such a problem, careful calculation, and the huge number of magic arrays, plus the keyhole is only the size of a palm, the problems add up, the requirements for the foundry are very high, and it should even be said that it is strict, I believe that even the supreme level caster may not be able to solve it.

It's like a high school level math Olympiad, not all high school students can solve it.

However, is Lin Chen's casting ability really only at the supreme level? No! Lin Chen's true casting ability had actually surpassed the supreme level and reached the level of a divine craftsman.

Although standing in front of the gate and thinking, in just half an hour, Lin Chen almost got the clue...