Amid the rumbling sound, Liu Xingxing, who was half asleep and half awake, suddenly woke up, ran out of the main building, looked towards the main building of the Undead Fortress, and his mouth slowly widened.
The supporting frame in the main building became thicker and larger, extending upward. More bones continued to attach to it, filling and wrapping the frame, layer by layer, making it thicker and heavier than before. The height also increased along with the frame. The main building, which was originally more than ten meters high, grew to a height of more than 30 meters.
A cold, majestic, and terrifying atmosphere spread from the main building and radiated to the surroundings. The wild animals around the fortress fled in all directions, and even the insects stopped chirping. Those who were slow to escape were frightened to death.
The platform surrounding the main building began to expand, with layers of bone plates extending outward, becoming wider.
[Congratulations, City Lord! Your castle's main building has been upgraded to level 2.]
It was not until the system prompt sounded in Li Ziyu's mind that the movement of the entire fortress completely stopped. He excitedly clicked on the prompt.
[Level 2 castle main building, area increased to 300 units, base speed increased to 50 km/h.]
It was a very simple introduction, but Li Ziyu knew that based on what had just happened, the changes were definitely more than just that, it was just that it was not mentioned in the system introduction.
"Boss—" Liu Xingxing rushed in from outside with panic on his face.
"Why are you coming to me instead of sleeping well?" Li Ziyu was in a good mood because of the fortress upgrade, and asked with a smile.
"Your fortress suddenly became bigger!" Liu Xingxing opened his arms and gestured.
"Don't worry, it's just an upgrade." Li Ziyu smiled politely and pretended to be cool.
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