Lothar stood in front of a heavy stone door.

He is located deep beneath the castle, at the end of a secret passage sealed by a thick layer of earth. If it weren't for the fact that Primo had already carved out the passage, it would have taken a lot of effort for him to find the stone door with his own vague memory.

Lothar played with the large metal key in her hand and observed the stone door, and found that the art styles of the two were very similar, and both belonged to the remnants of the Magic Empire of Netherduran.

"No wonder the Friedon family owns the legendary orb of Iolem, and sure enough, this family has ties to the Old Magic Empire."

Lothar raised her hand to brush the dust from the stone door and found the key in the center.

But when he inserted the metal key, it didn't turn as expected, and the stone door opened.

Shimen shook slightly, making a sound that made the eardrums tingle.

"Bloodline restriction prohibition detected."

The results of the analysis of the stone gate appeared on Lothar's retina.

"Bloodline...... Lothar nodded thoughtfully, "No wonder Primo can't open the stone door, it turns out that there are other conditions besides the key." ”

This condition is difficult for Primo to penetrate the void barrier and enter the sea of stars. Because it is extremely difficult to find a bloodline of descendants of an ancient empire that has disappeared for tens of thousands of years, even in the classical era. Not to mention, it is now the era of the law that has experienced the Great Collapse. That ancient magical empire basically exists only in legends, and even if it is written, there are very few of them.

But for Lothar to achieve this condition, it was only necessary to prick his own finger and drop a drop of blood on a specific groove in the stone door.

He did it right away.

Rumble......

The stone door opened.

Lothar had expected the smell of rot and mildew to come from behind the stone door, and a pile of dusty garbage that had long since been damaged beyond recognition.

Who knew that what presented to him was a huge room that was clean, tidy, and intact, ready to be used almost immediately.

Inside, there are a variety of Nesser-style magical experimenting tools, some large enough to occupy an entire wall, others small enough to fit on a table.

Despite their antiquity, the lab tools are in good condition, with a glittering metal exterior.

Unfortunately, Lothar discovered that these experimental tools had a unified source of energy, which he apparently did not have access to now.

That is the "Mither Energy Core", the power core of the Floating City.

The interior of this chamber is very different from the castle outside, and it is not made of the existing stone in the barony. Lothar can deduce from this that this chamber is a foreign object. And it's probably part of a floating city.

Floating City can be called a huge spaceship, so on this spaceship, there are naturally all kinds of "escape pods".

Lothar estimated that this chamber was an "escape pod" launched when a floating city fell.

Moreover, the members of the escape pod may be the ancestors of the Friedon family. And the entire castle was built to cover up the existence of this escape pod.

What's more, if Lothar's reasoning is correct, then there is a good chance that the floating city is near the Barony of Oran.

This escape chamber does not have the ability to travel long distances, and at most it can escape from the fall range of the floating city for about a hundred kilometers.

Lothar immediately drew a simple map of the castle's surroundings within a hundred kilometers with his astonishing memory. With the castle as the center, he drew a circle and examined the places located on the circle line one by one.

In the end, Lothar locked on the island of Carlin, which was more than a hundred kilometers away from the castle.

"It can't be such a coincidence. Carlin Island is the site where I joined the Dawn Explorers for testing, could it be a floating city? ”

Lothar took a closer look and saw that the outline of Carlin Island was a regular circle that would be difficult to form under natural circumstances, and it was very similar in size to a floating city of Nether.

All these conditions combined to give Lothar a seventy percent certainty that Carlin Island was a floating city that had fallen.

And Lothar also found a lot of information in Primo's dimensional bag to support his inference.

The mage who colluded with the undead had a very frequent correspondence with the island of Carlin. Almost every three days, a letter is sent to the island of Carlin.

There could only be one reason for abandoning the most convenient and quick means of magical communication in favor of traditional letters: the content of the letters is very high, the level of secrecy is high, and the use of magical communication can have a significant impact if it is discovered and intercepted by other mages.

And at this point in time, only a big event like the invasion of the undead requires Primo to be so cautious.

Through Primo's account, Lothar knew that it was likely that the island of Carlin had been infiltrated by the forces of the undead. In addition to frequently using letters to contact the undead on the island, Primo himself often visited the island for field trips.

He recorded many archaeological finds in his notebook, all of which were written and patterned related to the ancient Nether Empire.

"The Undead Scourge, the Ancient Floating City, the Dawn Explorer...... It's all about this little island. It seems that my trip to Carlin Island will not be boring. ”

Lothar scrutinized the chamber. Although the magic lab equipment was not available for the time being, he still found something useful.

In a storage compartment tucked under the table, a broken staff lay quietly.

The shaft was broken in two, and the gemstone set in the head of the rod had fallen off and had completely lost its luster.

Lothar picked up the staff, and the data was immediately fed back into her brain.

"You have opened the Mystic Illustrated Book: The Staff of Balance. Mystery: Normal. The current progress of the bestiary is 1%. ”

"The Staff of Balance, a type of high-customization equipment used by the Arcanists of Nether. Although common in the Nether era, it is rare today to be included in the Mystical Illustrated Book. Lothar said to herself.

The staff of balance that Lothar had found was completely damaged, and the gems set on it to provide magical energy were no longer worth repairing.

But instead of throwing away the Staff of Balance, Lothar took out the various tools she had with her and began to disassemble the Staff of Balance completely.

In the process of dismantling, he further figured out the principle of this magic circle and the spells that were constant on it.

And the progress of the Mystic Illustrated Book is also growing, eventually reaching 100%.

"Mystic Bestiary: Staff of Balance, progress to 100%, gain 2000 XP."

Lothar let out a sigh of relief as she looked at the numbers added to the experience pool.

In this secret room, in addition to the Balance Staff, there are more than a dozen other discarded magic items from the Nether era. Although these items are no longer usable, Lothar is still able to gain considerable experience points from the analysis and understanding of these magic items through the mysterious bestiary system.