After the Lich Emperor returned, Du You and the two sisters began to pick and choose what they had exchanged.

As for those undead fires, Du You directly threw them to the undead under his command, so that those undead who have the potential to continue to improve can absorb them, and maybe they can get higher-level undead creatures, and even increase the level of the troops.

And the rest, most of them are useless. The two sisters selected them in different categories.

Du You's target is those undead creatures. Some of the trades came back, but only a few of them were able to be used to craft new classes. But Du You doesn't need everything, and he doesn't lack low-level troops now. Even if you want to build, you have to get some of the troops you need.

So, in the end, Du You only picked out two troops. The first is the gravedigger, placed in a mass grave.

Gravedigger Level 30: 3,000 pieces/month, full price of 100 Green Crystals/piece (+100%)

Gravediggers are very good value for money, cheap and in large quantities. After the territory bonus, it can recruit 6,000 per month, and its strength has reached the peak of the third order.

In terms of combat effectiveness, the Gravedigger may be a little worse, because the weapon in his hand is a mining pickaxe, which is not suitable for combat. But its own defense is very strong, after all, it is a zombie-type undead.

What Du You really values is the universality of gravediggers, which can be used in too many places. Whether it's used to dig pits to create traps, or to help build walls in a territory, or to clean up the battlefield, mine, etc. All in all, there are no chores that this guy can't do.

This is simply an all-round migrant worker among the undead, and he can be used as cannon fodder when it is critical. Even this thing is much stronger than ordinary cannon fodder, and his third-order ordinary zombies are definitely not as good as this guy.

Even Du You couldn't help but incorporate it into his undead system. Besides, if it's not easy to use, it's a big deal not to recruit. The minerals that are useless in the underworld are now buried in the ground, and they may be able to find them.

The last class is the one used to trade the Bone Elephant, the Chaos Bone Spider.

Chaos Bone Spider Level 35: 500 per month, full price 150 Citrine Coins/one

Rarely, this spider-shaped undead is actually bone-based, rather than the usual corpse-based.

The Chaos Bone Spider is a giant bone spider, and from a distance, one might think it's a spider. The height is about two meters, and it relies on eight legs to support, so its own height can be adjusted.

The attack is by spitting out bone spurs or spider silk. This spider silk is not poisonous, but it is very sticky and tough, making it a powerful control unit. This can be regarded as making up for a deficiency in his own troops.

The Chaos Bone Spider does not have a very strong attack, but it carries a special curse that gives the attacked enemy a chance to cause chaos. Once there is chaos, it will attack everyone around you without distinction between friend and foe.

The most important thing is that the production of this thing is not low, and the price is not high. Even if you don't need it now, you can sell it later. With the rest of the undead troops, Du You can't see any bright spots. Without a bright class, Du You will not be able to construct it at all, which will only be a waste of places.

Du You now knows that even if it is a class building, there is a limit on the number of troops. It seems that the Boulder Fort with the most types of troops is now close to full value, and it is difficult to add new classes to it.

A few days later, Du You suddenly got a prompt on the panel, indicating that his territory experience was full.

"Great, it's finally worth it. Du You came to the Lord's Mansion excitedly, and 100,000 black crystal coins were thrown out directly. "Hurry up. Then, the crystals began to burn, and the progression began.

The entire territory was shrouded in a special force, but this power was not felt by ordinary people, so even if there were only many undead around watching and watching, no one would be able to find out what was happening here.

Du You finally calmed down, no matter how anxious he was, it was useless, because it would take three days to advance the territory. In the company of the two sisters, Du You waited tormentedly.

Three days was not very long, but this time it was related to whether he could gain a firm foothold in this world, and it was also related to his sixth-order advancement. I can't help but be nervous, soon, I will be different.

Three days have passed in a blink of an eye, and it will not be transferred by anyone's willpower. When the time arrived, Du You suddenly found that his territory was shrouded in a special layer of light.

The three main buildings of the territory and those outbuildings suddenly changed.

The surface of the building has been added with many ornate runes, which makes it look more beautiful and majestic. And these buildings are also a lot taller. Du You knew that with the upgrading of the territory, these buildings that were already one with the territory were advanced at the same time.

Of course, the role is still the same as before, but it has been upgraded from the fifth order to the sixth order.

In an instant, all the groups of demonic insects returned to their nests, or dug a hole in the ground, and then went underground to sleep. After the Demon Worm Swarm is raised to the sixth order, it will appear.

I don't know if these demon insect swarms will be the same as the ones I saw before after they reach the sixth order.

"Master, we now have a second sixth-order territory. ”

"That's it, but we can level up from time to time, and now it's already very high, there's no need to wait. Lin Yushi and the others were impatient, she didn't want to be weaker than the undead here.

Du Youwenyan smiled: "Yes, it's time to upgrade the level." Du You opened the panel and looked at the completion of his task. In the case that the two sisters can't see it, it really reached the level of 10 stars.

Du You breathed a sigh of relief, if this was not achieved, Du You didn't know what to do. But don't worry, just like Du You said, if you want to improve your level, you still have a sixth-order drawing in your hand.

Last time in the operation organized by the academy, I opened up the Black Mist Canyon by myself, and because I assisted in dealing with the sixth-order enemy, I got the sixth-order treasure chest. The Dragon Tomb blueprint that I once obtained can now be used.

I just don't know what kind of dragon undead can be produced in it, but it's really exciting to think about.

After appeasing the two sisters, Du You asked the undead to start building. However, it will take two days to build. Now Du You is not in a hurry, because the task has been completed and he can advance at any time. Du You didn't think that there would be any problems with his upgrades, after all, he didn't have any different skills or advanced skills to drag him down.