[Ding, the architectural blueprint of your corpse fly class has been purchased by Zhou Xu, and you get 900 first-order spars]

Almost as soon as Li Yuan put the drawings on the shelves, this architectural drawing of the class was directly seconded.

"Good guy, you're buying a house on the market."

"It's awesome."

Listening to the prompts of the system, Li Yuan sighed with emotion, and immediately opened the warehouse panel and looked at his current resources.

First-Order Death Crystals: 1186

2nd Order Death Crystals: 82

3rd Order Death Crystal: 12

Fourth-order death crystal: 1

Timber: 2,000 units (currently owns 12 lumberyards)

Stones: 1100 units (currently has seven quarries.)

These are all of Li Yuan's current resources.

It's still a lot worse to upgrade the pool of the underworld, but the territory can be upgraded.

Although Qin Yan's advice was given priority to upgrading the class building, in Li Yuan's opinion, the level of the territory could not be left behind.

The two complement each other, and it is not enough to just rely on dying to save resources to upgrade one.

Besides, Li Yuan is different from other lords in that he has a lot more troops and numbers.

Li Yuan believes that there are definitely not a few lords who have two class buildings at this stage, and even three are not impossible.

But there shouldn't be a few people like him who have four types of troops.

Not to mention the number of necromancy, every additional necromantic who enjoys the blessing of the aura of the underworld will greatly improve Li Yuan's strength.

Moreover, he also has two defensive arrow towers, and he has seen the power of the arrow towers with his own eyes, and Li Yuan wishes that the stronger the arrow tower, the better.

"I'm all content with the hedron now, and all that's left is wood and stone."

Li Yuan opened the chat channel and sent a message to Li Jie.

For this big timber household, Li Yuan's image is still very deep.

[Li Yuan: Are you there? 】

Li Jie replied in seconds.

[Li Jie: Zaizai, it turned out to be Li Yuan's boss, you need wood again? 】

[Li Yuan: I need 3,000 wood, do you have it?] 】

[Li Jie: The big guy wants me to have it, or according to the exchange rate last time? 】

[Li Yuan: Okay, this time I'll trade with a third-order spar]

It stands to reason that after a day of time, the exchange ratio of ordinary resources and spars should have decreased a little.

But Li Jie's wood was already cheaper than the market, and Li Yuan didn't care, but exchanged 5 third-order spars for 3,000 units of wood with Li Jie.

Then from the market, he exchanged three third-order spars and a small number of second-order spars for two thousand stone blocks.

In this way, all the materials for the territory upgrade are gathered.

Li Yuan came to the side of the pool of the underworld, looked at his territory hut, and then chose to start upgrading.

[Ding, whether to confirm the upgrade of the underworld, yes/no]

"Yes."

As the words fell, a pillar of light fell from the sky, enveloping Li Yuan's underworld.

Soon, the earth shook, and gray light began to spread from the underworld hut to all directions, and the original two-thousand-meter territory area was also growing rapidly.

After five minutes, the light disappeared, and the area of Li Yuan's territory also expanded several times.

At the same time, a series of system prompts also sounded in Li Yuan's mind.

[Congratulations to Hades King Li Yuan, your underworld has been successfully upgraded to a fourth-level underworld, with your defense doubled and your sphere of influence increased by 5,000 meters]

[Your Netherworld upgrade is successful, you and your subordinates will get attribute bonuses within the Netherworld, and the realm will be increased by 3 levels (you can't upgrade across major levels)]

[Your Netherworld has been successfully upgraded, your spiritual determination has been improved, and any creature that enters your territory without permission will be seen by you]

[Your Netherworld has been successfully upgraded to an intermediate Netherworld and you will gain skill flash]

[Special reminder, due to the success of your Netherworld upgrade, some powerful beings in the Necropolis have noticed you, and a small number of them have awakened from their slumber]

...

"It's finally a success."

Li Yuan exhaled lightly, and a smile appeared on the corner of his mouth.

The fourth-level underworld was about the same as he had imagined, and the area had increased to five thousand meters (diameter).

The rest hasn't changed much, but there's an extra blink skill.

[Flash: (Exclusive to Intermediate Lords)]

Within your territory, you can flash a distance of 1000 meters in any direction.

cd：30s

"This should be a life-saving skill added to the liege."

Li Yuan looked at the introduction of the flashing skill and thought thoughtfully.

This thing is not very powerful, at most it saves the lord some time to travel.

The territory is really invaded by a strong enemy, and 30cd is enough for the other party to kill you ten times, but in any case, this skill is still somewhat helpful to the lord at this stage, and it is better than nothing.

Li Yuan smacked his lips.

"That's right."

He turned his gaze to the upgraded Underworld Hut.

I took a look at the upgrade conditions of the fifth-level underworld.

【Level 4 Underworld】

[Area: 5000 meters]

【Owning Building 22】

[Aura Possession: 1]

[Upgrade Requirements:

1000 2nd Order Death Hedron (unsatisfied)

100 third-order death crystals (unsatisfied)

10 4th Order Death Crystal (Unsatisfied)

1 Fifth Order Death Hedron (Unsatisfied)】

1w unit wood (unsatisfied)

500 units of copper ore (unmet)

[Current Status: Invincible]

[Faction: Death]

"Fortunately, the level 5 Netherworld upgrade requirements are not very exaggerated."

Li Yuan glanced at the upgrade request and breathed a sigh of relief.

In addition to the fifth-order death spar and copper ore, it was only a matter of time before the other materials were ready.

After the upgrade of the underworld, many of the large tombs with a radius of 5,000 meters were shrouded in the territory area.

Needless to say, the fate of these zombies in the grave face the undead spirits blessed by the aura of the underworld.

The only pity is that within five thousand meters of the underworld, there is no grave of fifth-order zombies.

There are only five fourth-order zombie tombs, and a large number of third-order, which is somewhat a fly in the ointment.

After upgrading the territory, Li Yuan sent a necromantic team to cooperate with the steady and steady fight, pushing all the way.

Due to the fact that the fourth-order necromancers gained too little experience from killing zombies below the third order, Li Yuan deliberately let the eight fourth-order necromancers avoid the low-level zombies, and did not let them share the experience of other necromancers.

In this way, the other second- and third-order necromancy upgrades are much faster.

It wasn't until evening that Li Yuan finally cleared up the monsters in his territory.

At this time, all of Li Yuan's thirty-two necromants had reached the fourth order, and with the blessing of the aura of the underworld, they were seventh-order combat power.

At this moment, the 32 necromancers exuded a strong death power, neatly arranged in front of Li Yuan, giving people a suffocating sense of oppression.

Just when Li Yuan was carrying his hands on his back, ready to test the strength of the necromancers.

A ray of night fell quietly.

[Ding, World Announcement - Special Reminder]

[Night falls, mysterious resurrection, strange power erodes the endless continent, the strength of all wild monsters has been enhanced, the explosion rate has doubled, non-dark and evil lord classes, the strength will decrease to varying degrees, and the strength of death class troops will be doubled]

[Friendly reminder: all the gifts of fate are secretly marked with prices]

[There are still four days and one night before the end of the protection period, please seize the opportunity to remind yourself of your strength as soon as possible]

Hearing the system prompt, Li Yuan knew that the third night had come.