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  This is an extremely thick and heavy rock wall, like the Broken Dragon Stone, the entire rock wall moves very slowly, taking a full hour to open up a passageway that only one person can walk through, this passageway is pitch black, with step by step stairs extending downward.

  This rock wall is so thick and heavy, I don't know how much it weighs. It took a whole hour just to open the passage, and if outsiders hadn't discovered this hidden book room, even if they had destroyed the place, they wouldn't have been able to find this passageway. You could say that this passageway is absolutely safe.

  "Come with me!" At this time, Grandpa lit the oil lamp and led the way down the stairs.

  Wei Zi followed silently behind his grandfather, this passageway was so hidden and quiet, he didn't even know what was underneath.

  But one thing is certain, the things below are extremely precious. Even if all the valuable secret recipes in the hidden book room were added up, they couldn't compare to the value of what's stored below. Wei Ziming became even more curious.

  This stone step is a bit too long, Wei Ziming secretly counted in his heart, now he has walked up to thousands of steps, the steep steps continue to extend downwards, and it's unknown how deep they extend underground.

  "It's almost here!" Just as Wei Ziming was pondering how deep this passage was, he suddenly heard his grandfather's voice. Wei Ziming immediately felt a surge of joy and an expectant expression appeared on his face.

  After a while, the old man and his grandson finally arrived at the hidden underground chamber deep beneath the ground. After lighting all the lamps, the room suddenly brightened up, revealing that this underground chamber was not very large, about 100 square meters in size, similar to the secret library above, but with one major difference - this chamber was extremely empty.

  On one wall, there was a thick wooden cabinet that stuck to the wall. Inside the cabinet, several white jade boxes were placed. Counting them carefully, there were about a hundred of these jade boxes, not many, and it was unclear what they contained.

  "These jade boxes contain some medicinal materials, although they are just ordinary medicinal materials, but the years are long, all of which are over 100 years old, so these medicinal materials are very precious and are things that our Wei family has collected for a long time." Grandfather Wei Yongde's eyes fell on the jade box in front of him, explaining slowly.

  Wei Ziming heard this and his expression changed, then he opened his mouth to say "Grandfather, these medicinal materials are indeed precious, but it's not worth opening up a secret room just for them, is it?"

  "Zi Ming! Do you know why our Wei family was annihilated more than a hundred years ago?" Grandfather Wei Yongde did not answer directly, but instead spoke with a sigh.

  Wei Ziming slightly shook his head. He didn't know, but he also knew that Grandfather wasn't asking him to answer anything, just sighing and lamenting here.

  However, Wei Ziming was still able to guess a thing or two from his grandfather's emotions, which should be related to something in this secret room. The Wei family almost got exterminated because of this thing too.

  "It's the treasure that brought us to the brink of destruction! The treasure that nearly wiped out our family is hidden in this very secret room." Grandfather Wei Yongde shook his head slightly, then spoke with a tinge of sadness.

  "What kind of treasure is this, grandfather?" Wei Ziming asked curiously.

  Grandfather heard this, but didn't give a direct answer. Instead, he pressed something in an inconspicuous place and triggered another mechanism. With a loud rumbling sound, the floor in the middle of the secret room slid to both sides, revealing an opening. Then, from this opening, a small stone platform rose up.

  Finally, with a "click" sound, the stone platform that rose from the mouth stopped moving. Wei Ziming saw something strange on this platform, something he couldn't have imagined.

  "What is this? A toad? This thing almost wiped out our family?" Wei Ziming stared at the thing on the stone platform in shock, his voice filled with incredulity.

  On this stone pedestal is placed a black toad, made of metal casting, looking somewhat old like an antique sculpture.

  This toad is not big, only the size of a palm, its body is covered with irregular iron-like warts, vivid and lifelike, exceptionally expressive, so it looks extremely ugly, but at the same time gives people a sense of majesty and power.

  "Not bad! It's a toad, this is a rare treasure, it's a rare congenital treasure, its name is called 'Toad Furnace'."

  An ordinary congenital treasure, although it is also extremely precious, but not to the point of being coveted by others. After all, at that time our Wei family had a congenital strongman sitting in town. The problem is that this congenital treasure is extremely unusual. Grandfather Wei Yongde walked forward, gently stroking this only extremely ugly toad, as if stroking his lover, with a strange emotion in his eyes, and also opened his mouth to explain.

  "What is a pre-heavenly treasure? What kind of thing is it? And what's so special about this ugly toad?" Wei Ziming also heard the name for the first time, and asked with a questioning tone.

  It can be seen that if the treasure is divided into grades, then the divine weapon is the first grade, and the innate treasure device is the second grade.

  "It's really lucky to get a divine sword, generally speaking, divine swords are used by innate strong people, and innate treasures are even more precious. Among 100 innate strong people, only one or two have an innate treasure, so it's extremely rare. Even for innate strong people, it's hard to obtain such a treasure." Grandfather Wei Yongde explained slowly.

  "This 'toad stove' is also a rare treasure among the prenatal treasures, do you know why so many years of medicinal materials are placed here?" Grandfather Wei Yongde asked Wei Ziming.

  "I don't know! Is it related to this 'Toad Stove'? And how can this iron toad be considered a stove when it doesn't even look like one?" Wei Ziming asked, staring at the iron toad in front of him.

  "Hehe! Appearance is not everything, and it's not that it isn't, there are so many medicinal materials placed here, all because of this 'toad stove'."

  Although I couldn't make this 'toad stove' recognize its master, even if it doesn't recognize its master, this 'toad stove' still has a magical use." Grandfather Wei Yongde chuckled.

  "What's so special about it?" Wei Ziming asked curiously.

  "Just put the medicinal materials into the 'Toad Furnace', and then infuse it with flame attribute inner energy, it can automatically refine the elixir, and the success rate is extremely high."

  To know that I am not a Danzong master, but can even be said to be an outsider of Danzong, yet I can use this 'Hasuo furnace' to refine extremely high-quality elixirs.

  "If such a treasure were to fall into the hands of the Alchemy Sect's master, one can imagine what kind of outcome it would have." Grandfather Wei Yongde said calmly, but his tone revealed an unparalleled sense of pride, which clearly originated from this 'Toad Furnace'.

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