Li Ziyu ignored the ghosts on guard and began to think about strengthening the fortress. Now that he had the resources and the enemies were coming with guns, of course he had to increase his own strength.
The first thing to do is to install ferocious ramming horns on the mobile fortress.
【Ferocious horns】
[Introduction: Are you still worried about how to deal with the enemy's walls? Are you still hesitant about how to break through the enemy's fortress? The Fierce Horn is worth it. With it, you can charge forward without restraint, and with it, you can break through the enemy's defenses. What are you hesitating about? Build it!]
[Construction requirements: Skeletons*5000 units]
【Occupied area: None】
The ferocious ramming horn is an attack weapon specifically targeting building defenses. It was not used before, but now there is a chance. You are an armored vehicle, come here, let’s see if I can kill you with one hit!
It’s just 5,000 units of skeletons, that’s no big deal, go away.
Li Ziyu didn't think about it at all and chose to build it directly. Then he looked at the main building of the fortress. To upgrade to a level 3 fortress, he needed bones*3000 units and soul energy*units. It was not a big deal. The soul energy had been reserved before and he could use it directly now.
Fortress, upgrade!
Boom!
As the upgrade order was issued, the Skeleton Undead Mobile Fortress suddenly trembled and made a loud noise.
The minotaurs who had not rested yet stood up, picked up the totem poles, and protected the children with serious faces. They were confused. It didn't feel like an enemy was attacking. Could it be an earth dragon turning over?
Zhang Peng and Liu Xingxing, who had just returned to the fortress, ran out again and looked around in confusion.
At this moment, something strange happened in the Undead Fortress, and bones surged.
The original floor of the bone platform was paved with bones and was very rough. Now, thick white square bricks are inlaid on the ground. Only when you look closely can you find that there are fossilized bones among those tiles.
The main building had also changed. The height was still thirty meters, but more and more skeletons appeared on it, filling the gaps layer by layer, making the walls of the main building thicker and taking on the shape of a rectangular block, just like an ancient medieval castle.
The bone plate platform and the main building were renovated. Just when Minotaur, Zhang Peng and Liu Xingxing thought it was over, a new round of changes came and the entire platform began to expand wildly.
Li Ziyu in the main building did not expect that there would be such a big change from level 2 to level 3. The defense of the main building was improved, the bone plate platform was renovated, and at the same time, the area increased directly from the original 300 units to 900 units!
I used to worry that there wouldn’t be enough space to build a large cemetery, but now I don’t have to worry about that at all. There’s plenty of space and it’s easy to place everything there.
Standing on the top of the main building, I took a look and thought, "This is all the kingdom I have built." A sense of satisfaction came naturally.
[Congratulations, your Skeleton Undead Mobile Fortress has been upgraded from level 2 to level 3.]
Li Ziyu saw a prompt from the system. He clicked it and saw that the fortress had been upgraded to level 3, which was the highest level. If it was to be upgraded again, it would require a breakthrough, which was a big level. However, it was not the right time yet.
I checked the buildings in the system and found that there are some more. Some of them are quite strange, such as bone plates. This thing is the kind used to pave platforms. It can be exchanged for bones to increase the area of the fortress.
Li Ziyu is quite satisfied with this upgrade.
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