Lu Yu ignored him and focused his gaze on the stone bricks of the city wall.
"This is not the craft of today's era, this is the forging method of the Middle Ages. In the Middle Ages, there was a large amount of black dragon iron. When making city wall masonry, these iron filings would be mixed in to make the wall indestructible, even with the spirit stone cannon.
Unbreakable!"
Lu Yu put his hand on the wall, rubbing the feeling coming from the solid wall, and frowned.
He has studied ancient and modern times, so he naturally knows some things that ordinary people don't know.
The black dragon iron was later cut off, and only the royal family and a few families owned a small part of it, which could only be used to refine some precious magic weapons and could not be used to cast city walls at all.
Nowadays, only some top big cities, such as Imperial Capital Xiliang and other cities, use extraterritorial meteorite iron to pour into the wall bricks.
But even in the Middle Ages, black dragon iron was still a rare thing.
It is definitely not an ordinary city that can use such precious materials to cast city walls.
"Wait! Xinling Star is around Xiliang Mansion. In the medieval period, there were very few city walls that could cast black dragon iron. Could this be the ruins of a medieval city!"
Lu Yu felt that his heart could not help beating.
The melee in the Middle Ages caused many once-splendid cities to disappear from everyone's sight.
There are many coveted treasures hidden in these medieval cities.
There are even some famous cities with treasures that are enough to attract powerful people at the level of Dao Lord.
This is definitely a shocking creation!
Lu Yu even felt that the destiny he had cultivated had changed his destiny, making everything he encountered become incredible.
Walking along the city wall, Lu Yu soon came to a huge city gate.
The city gate was completely closed, and only a solitary gate stood completely in front of him. The rest had no unnecessary decorations. It was still surrounded by cold and strict walls, firmly protecting the things inside the city wall.
"I tried various methods before, but couldn't open the city gate, so I had to grind it here little by little." Tan Yaoxian stood aside and sighed.
Sitting on a treasure mountain but not having it is the most helpless thing.
Lu Yu nodded and pressed his hand on the city gate.
Unexpectedly, the city gate only trembled slightly but did not open.
"This city gate is usually mixed with black dragon iron. Which city gate is this?" Lu Yu put his hand on it and felt a storm in his heart.
"Open it for me!"
Lu Yu suddenly shouted loudly and took a step forward, golden light flashing in the palm of his hand.
The peak power of the Martial Saint burst out directly!
His blood was soaring to the sky. At this moment, Lu Yu's full strength was like a fully stretched bowstring, suddenly letting go, bursting out with incomparable power.
Bang——
The palm of his hand hit the city gate, and this hard city gate finally made a loud noise.
In the originally dark cave underground, the sound of metal and stone hitting each other kept coming, and it never stopped for a long time.
The city gate shook more and more violently, and powerful forces moved on the city gate.
The moment the two city gates shook each other, a crack finally appeared in the city gate!
Lu Yu's power is equivalent to the strength of ten thousand people. He can move mountains and fill seas. He is omnipotent!
But such a terrifying force actually only opened a crack in the city gate!