The light curtain has disappeared. The scene just now made Zhu Yan feel a little uncomfortable, but soon he was relieved. This was just a game. Everything in it was artificially designed, and there was no comparison at all; Disappeared, and on the wall next to it, a stone slab slowly rose up, revealing a hidden compartment. There was a thick book inside, which seemed to be well-preserved; Zhu Yan walked up and took it out of the hidden compartment. Come out and take a closer look; This is a basic book about engineering, the content inside is very general, and it talks about some engineering principles; This book is also an item that players can use. After using it, you can learn about engineering. Side hustle; learning engineering side hustle in the main city costs ten silver coins. This book is just for players who want to learn engineering to save ten silver coins. It is of no great use; This is just a very ordinary book , I don¡¯t know why it was put into this dark compartment, Zhu Yan scratched his head and flipped through it casually; At this time, a thin bookmark fell from the book, and that bookmark also exuded light blue. The light of the object; Zhu Yan picked it up out of curiosity and was a little surprised; This turned out to be an engineering drawing, but if there was no luster, Zhu Yan must have thought that it was a piece of waste paper that had been scribbled on; This bookmark The text on it was scrawled and messy, and the pattern looked like a child's graffiti. Zhu Yan recognized it carefully; " They ignored me, how disgusting! That toy castle was so ridiculous, they actually played with gusto. I really don¡¯t know what to play with that ugly toy; I want to build a big guy that can smash their ugly toy in one go. That¡¯s a good idea! His length should be, No, the torque is too high, it will fall apart after just a few uses. There is something wrong with the formula, it should be overturned and recalculated" " Below are some symbols and formulas that Zhu Yan can't understand, so just skip them. , you can see it. The owner of the bookmark originally just planned to make a toy, but later he became more and more serious; Zhu Yan skipped the complicated formulas and incomprehensible symbols and looked at the last sentence; "Hey. This is me It¡¯s something that should be played. It only takes one stone to smash those guys¡¯ castles. Moreover, these magic lines seem to have some effect and can produce frost-like properties. It¡¯s such an unexpected surprise! The small bookmark actually gave Zhu Yan the feeling of finding it without any effort; because this was a blueprint for making a frost trebuchet; after Zhu Yan read the words on the bookmark. A dazzling light flashed across the bookmark in his hand. It turned into a scroll-like item, and its attributes were truly revealed; Item name: Frost trebuchet (drawing), attributes: After use, you can learn to make a frost trebuchet (1), usage requirements: advanced engineering; This is the engineering drawing that players can use. However, Zhu Yan felt a sense of loss when he saw this standard drawing in his hand. He still liked the bookmark-like drawing just now; This drawing can only make one aircraft The frost trebuchet will disappear after it is made. One trebuchet is not enough. Zhu Yan is ready to continue exploring. I wonder if after clearing this copy, I can get some more production drawings of siege equipment; Frost trebuchet The drawings of the machine made Zhu Yan lose interest in continuing to read the books in his hand. Zhu Yan did not study engineering as a side job and was not very interested in this book. He put the half-read book into the package. This book can be given to others. Friends who want to learn engineering, after studying the basic engineering textbooks of ancient goblins, you may have some unexpected surprises; Zhu Yan turned around and was about to leave the library when he suddenly heard the beeping alarm sound coming from the mechanical ball. A short burst of red light was emitted from the big eyes, pointing in the direction to Zhu Yan's left; Zhu Yan's heart sank, and he was ready to fight; Green light indicates good things, red light indicates danger; Sure enough, very soon A robot-like monster slowly walked out from the depths of the library; This robot looks very similar to the real housekeeping robot, except that it is more refined than the real housekeeping robot, and it looks no different from a real person; Name: Library Maintainer (Elite), Level: Level 40, HP: 60000/60000 It is another elite monster, just like the mechanical snake we encountered earlier. It looks like it should be a character similar to a librarian. ; However, it looks very empty here, without anything else.?Monsters, if they fight, will not attract other monsters halfway; Zhu Yan summoned all the summons and directed them to rush towards this elite monster; "Intruder, this is not the place you should come;" the defender said With a mechanical sound, the two arms flipped and transformed, combining into two slightly curved long knives; Bang~ The dead wood warrior raised the mace and smashed it at the defender's head, but was directly blocked by the long knife waved by the opponent in his right hand. This scene looks a bit funny. The dead wood warrior is three meters tall, but the defender is about the same height as an ordinary human, or even shorter. The two of them fight each other, and they are evenly matched; No, the defender is actually taller, and they are fighting against each other. After a moment, a damage of more than 200 points appeared on the head of the dead wood warrior, while the words "parry" appeared on the head of the defender; "Shua~" The defender's body jumped fiercely, and he jumped over the dead wood. Above the warrior's head, two arms were waving continuously, and the long sword drew a brilliant sword light, continuously striking the dead wood warrior's body. When the defender landed, he actually hit thirty-two consecutive blows, and the dead wood warrior's health increased sharply. It dropped by half; As soon as they met, the dead wood warrior was about to be killed, leaving Zhu Yan a little stunned; The roots of the tree were entangled! The dead wood warrior stomped his foot, and the tree roots stretched out from the ground and wrapped around the defender. A root spread upwards from under his feet. It just spread to the waist, but suddenly tilted to one side, as if it had slipped. A mysterious ss emerged from the defender. The defender's head floated up; But soon, several thick tree roots were entangled towards it. After being confused several times, a root finally successfully entangled the defender; Zhu Yan felt the cold sweat, luckily This function has a range, otherwise it will definitely not be able to restrain the machine maintainer; However, even if it is restrained, the original six-second winding time has been shortened to more than three seconds, almost shortened by half, and the maintainer's body surface There seems to be a special material that can greatly reduce the time of immobilization; While the defender was restrained, all the summons and Zhu Yan rushed forward and besieged it; However, except for Zhu Yan's thunder claws and immortal cold flames, It can dodge almost half of other attacks, and even if it hits it, it will be resisted by its super high defense; after three seconds, the defender's health has only dropped seven or eight thousand points, thanks to Zhu Yan has two powerful skills that can cause real damage; Three seconds later, the thick tree roots slowly retracted, and the defender regained his mobility. Its figure suddenly became blurred, and its speed increased by a lot. He cut and rushed towards Zhu Yan; The two long knives in his hands were like a gust of wind, and a ball of sword light enveloped Zhu Yan, and Zhu Yan retreated quickly; This defender does not look like a librarian at all , and like a swordsman, its speed is too fast, three points faster than a mechanical snake. Even ordinary attacks can exert great power; Zhu Yan transformed into a grizzly bear, and his health and defense were greatly improved. A large part of it. Every time the defender attacks, it can only take away dozens of points of Zhu Yan's health; Zhu Yan is not prepared to fight it head-on. He turns around and runs towards the bookshelf. The distance between the bookshelf is very short. Fight there. Can limit the speed of this defender; The defender keeps chasing Zhu Yan, without paying any attention to the attacks of the summons behind him. The flame attack and venom attack of the flame poison ivy can cause considerable damage to it. The defender's health Slowly descending; Zhu Yan jumped towards the aisle between the bookshelves. The defender suddenly accelerated and came back to chop at him. The aisle was very narrow. Zhu Yan waved his bear paw and hit the defender; Bang, fleshy palm. After colliding with the long knife, Zhu Yan only felt numb for a while, and a white mark appeared on his palm. Then, Zhu Yan rushed towards the defender; with a bang, he knocked it to the ground. The defender suddenly lost his balance and couldn't hold his hands. Stopped waving, the long knife struck the bookshelf next to it, making a sound of metal clashing; These bookshelves are all made of steel and look very hard; After the defender's long knife struck the bookshelf, fear appeared on the metal face With a look on his face, his hands returned to their human appearance, and he continued to attack Zhu Yan regardless of the situation. He turned over and rushed towards the bookshelf he had just cut; Looking frightened; The defender's eyes glowed with scarlet light, flashing randomly, and the CPU speed increased to the extreme; After a moment, the defender stood up, his face was as calm as water, he clenched his fist and rushed towards Zhu Yan; " Intruders who damage library items should be punished! "The defender shouted in a low voice; Zhu Yan was stunned.??, this is also okay? Bang, the defender punched Zhu Yan, and a damage of more than 300 points appeared from the top of Zhu Yan's head. The damage caused by its fist attack was almost the same as that caused by the long knife attack; However, the defender who used his fists The speed suddenly increased a lot, faster than before. Moreover, in such a narrow place between the bookshelves, it was unable to limit its speed. Zhu Yan only felt that his eyes were dazzled. They were all maintainers, and he could not catch the maintainers at all. Or, let alone attack; Bang Bang Bang~ Zhu Yan felt like a sandbag, being beaten around and around, and his blood volume dropped quickly. Even if he transformed into a black bear, he could not hold on for long; (To be continued. . )