Without the little elephant absorbing the aura, the spiritual vein quickly became energetic, and glanced at Dong Wu with gratitude, and then the dragon head lay down, put Dong Wu on top of his head, and floated to the ground!

Standing on top of the dragon head of the spiritual vein, Dong Wu was overjoyed, you must know that the spiritual vein is automatically emitting spiritual energy on weekdays, and once it is recognized by the spiritual vein, then the spiritual energy emitted by the spiritual vein can be increased by as much as two percent.

If you can make the spiritual vein recognize the master, then the spiritual vein will live and die with its owner, and others can no longer take it away, and the spiritual vein will do its best to exude spiritual energy, which can be increased to 50% of the normal spiritual energy.

However, there are many people in the world who have obtained the spiritual vein, but there are very few people who can make the spirit of the spiritual vein recognize, and even fewer people can make the spiritual vein recognize the Lord.

Now this arrogant spiritual vein actually let Dong Wu stand on his head, it can be seen that this spiritual vein has recognized Dong Wu as the master in order to thank Dong Wu for saving his life, and Dong Wu is naturally very happy to have such a happy event!

The spiritual vein is an underground elf, and the speed of the earth escape is naturally extremely fast, all the way up, and soon Dong Wu was sent to the ground, and he glanced at Dong Wu with respect, and then suddenly plunged into the depths of the ground, disappeared, and was absorbed by the little elephant so much spiritual energy, the spiritual vein was already extremely weak, but he was looking for a place to recover!

In the study, Dong Wu sat in front of the table, holding a jade slip, and was carefully examining it with full attention, and before the table, Lu Fu stared at Dong Wu's expression nervously, like a suspect waiting for the verdict!

On the bookshelf on the side, the little elephant named Hairball by Dong Wu was throwing around with his nose curling the books on it, and he was having a lot of fun, but the littered books always made a burst of noise, which made Luffy more and more nervous!

After a few days of sleepless efforts, Lu Fu finally came up with a drawing of the construction of the core of the fairy city, which was the jade slip in Dong Wu's hand.

The core of Xiancheng is related to the energy acquisition method of the entire Xiancheng in the future, the size of Xiancheng, the strength of defense and other aspects, which is equivalent to a car engine, the engine is not good, even if other parts are made well, the car will not run fast!

Take Tiancheng as an example, the core of its immortal city is the spiritual vein, once there is a problem with the spiritual vein and the energy source is cut off, the heavenly city will not be far from destruction!

Of course, the core construction methods of each immortal city recorded in the Immortal Mansion Casting Treasure Book have been tempered thousands of times, and they have almost reached the point of perfection, and they cannot be changed even a little.

Even if Lu Fu is Lu Ban alive, it is impossible to design a new core design of the fairy city in just a few days.

His task was only to find a few of the best ones among the hundreds of immortal city cores recorded in the Immortal Mansion Casting Treasure Book for Dong Wu to choose!

Looking at the several immortal mansion cores recorded in the jade slips, Dong Wu couldn't help frowning, but he couldn't make a decision for a long time, once the immortal mansion core was selected, it couldn't be changed, he planned to use this newly built immortal city as the future capital of the Heavenly Court, so he naturally needed to be cautious!

It's just that there are pros and cons, and these kinds of immortal mansion cores selected by Lu Fu are strong and strong, but they all have certain restrictions, which makes Dong Wu unable to be completely satisfied!

For example, once the core of the immortal mansion of the refining weapon is completed, every time a magic weapon is refined in this immortal city, the immortal city will absorb the treasure qi leaked when the magic weapon is practiced, and grow by one point.

And in the middle of the fairy city, a treasure land of refining weapons will be born, as long as the raw materials are invested, the magic weapon can be automatically bred, and even refining the magic weapon in this treasure land, it will also be blessed, and the magic weapon refined is at least three points stronger than the original!

There are also alchemy cores, alchemy cores, business cores, five elements cores, aura cores, devouring cores, soul cores, supernatural cores, cultivation cores, defense cores, etc.

Each kind of core corresponds to a specific immortal city direction, has its special effect, and also has its special limitations, with Dong Wu's ambition, he naturally does not want to see his future capital city have such obvious weaknesses!

Dong Wu, who couldn't think of any good solution for a while, hesitated for a long time, and finally set his eyes on the core of the Five Elements Immortal City that Lu Fu strongly recommended.

The Five Elements Immortal City can automatically devour the Five Elements Spiritual Qi in the air to enhance the city, the Five Elements Secret Land can be born, and the cultivation of the Five Elements attribute exercises, the cultivation speed of the monks with supernatural powers in the city can be blessed to a certain extent, and the development is relatively balanced, there are no too obvious weaknesses, relatively speaking, it also meets Dong Wu's requirements!

Just as Dong Wu made up his mind and planned to order Lu Fu to start construction, Huo Ran had a flash of inspiration, after all, he was reluctant to give up the special effects of other immortal city cores, and hurriedly asked: "Master Lu, do you see that on top of an immortal city, can you install a few more immortal mansion cores?"

"This ......" Luffy pondered for a moment, sighed and said: "Actually, the old man also thought of installing two or more cores on top of an immortal city to jointly drive the operation of the immortal city.

However, building multiple cores requires the consumption of a lot of precious materials, not to mention, a fairy city is equivalent to a magic weapon, each part has its own unique role,

Once the two cores are in the same city, their efficacy and energy will interfere with each other, and at least the special effect of the immortal city will be weakened, and the energy will be disordered, making the cultivators in it go crazy, and at worst, it will explode directly, and the city will be destroyed and people will die!

This is equivalent to one body, but there are two consciousnesses in general, both want to fight for the control of the body, either they will die together, or one side will perish, and it is impossible to coexist peacefully!"

"That's it!Then I have to build a five-element class!" Dong Wu frowned, but he looked very disappointed, obviously there are so many immortal city cores, but he can only build a five-element immortal city, which is equivalent to entering Baoshan, but he can only take away one treasure, think about it, it's really unwilling!,

"That subordinate retires!" Luffy looked at Dong Wu, shook his head, sighed, stepped back, and walked out of the study, since the core has been chosen, it is natural to start preparing quickly!

"Alas, wait, the deity has a good idea!" Huo Ran, Dong Wu slapped his thigh suddenly, hurriedly called Lu Fu, who wanted to leave, and said: "Since the two cores can't appear in one immortal city, then let's just build two immortal cities!"

We can first build a main immortal city, for the heavenly court to govern, in the use of special immortal city cores according to needs, build a large number of small immortal cities, become the acropolis of the main immortal city, in the layout of specific formations, but also by the way to protect the main immortal city,

In this way, you can not only enjoy the special effects of the core of other immortal cities, but also provide a thick layer of protection for the main immortal city, which can be described as killing two birds with one stone, why not do that!"

"That's doable!" Luffy nodded, then hesitated for a moment, and said: "It's just that the core of the Immortal City is extremely precious, even if it is the worst one, it also needs to consume billions of spirit stones, and there are many repetitions in terms of efficacy, it is too wasteful to build so many Immortal Cities!"

"Don't worry, the deity also knows that this idea costs a lot, and it is not necessary to get it all at once, this is just an idea, and it will be slowly built in the future!"

Dong Wu smiled slightly, and continued: "In this way, you first build a core of the Five Elements Immortal City as the main immortal city, and then build a core of the refining immortal city, a core of the refining immortal city, a core of the alchemy immortal city, and a core of the trading immortal city.

Because our current spirit stones are insufficient, we still have to focus on the main immortal city, and then you build four more immortal mansions, and replace the core of the immortal mansion with the core of the immortal city, I believe that in this way, you can save most of the spirit stones that cast the body of the immortal city, and you can also make the immortal mansion obtain some of the special effects that only the immortal city has!"

This is equivalent to installing the engine of the aircraft on the aircraft model, although the efficacy cannot be compared, but at least it can fly, and save money, it is really not possible to remove the engine and reinstall it on the aircraft!

"Lord Shengming, my subordinates admire!" Hearing this, Lu Fu couldn't help but glance at Dong Wu with admiration, this lord is really powerful, he can come up with such a strange way to solve the problem of the core conflict in Xiancheng in such a short time, but this idea requires too many spirit stones, it would be better if it could be cheaper!

"Well, go and prepare, if you need anything, you can take my token and go to Rulin!" Dong Wu nodded, waved his hand and drank Lufu, turned around, and found a place to retreat and cultivate.

In terms of construction, there is Lu Fu presiding, Lingshi is presided over by Rulin, and in terms of manpower, it happens that a large number of disciples of the Five Elements Sect were captured some time ago, which can pull strong Ding, but help build the city, and can save a lot of wages!

In terms of the army, Kong Fang and several other army commanders were also busy training the soldiers under their command, and they had no time to deal with Dong Wu.

It is worth mentioning that the three legions of the God Killing Army, the Blood God Army, and the Giant God Army just divided the newly trained 150,000 heavenly soldiers, and a legion of 50,000 people is busy running in the team, so naturally they are busy with their feet not touching the ground!

As for the Shen-like Demon God Army, he was much more comfortable, flying around in the sky with his group of golden eagle brothers all day long, while touring the mountains and rivers, by the way, he recruited the monsters and monsters that he encountered on the road with good strength!

And Rulin and other people in the God of Wealth Temple are even busier, now there are a large number of people gathered around, and where there are people, there is business, such a good opportunity, how can this group of wealth fans in the God of Wealth Temple let go,

Naturally, I took this opportunity to make a good profit, plus I had to prepare materials for building the heavenly court for Luffy, so when I was busy, the soles of my shoes could grind out sparks!

Wei Feng, the newly appointed director of the Tianlei Palace's Broken Xing Division, was busy dealing with contradictions all day long, Black Bear was busy arresting people, Xiao Bai was busy setting up a secret research institute, in short, they were all very busy, only Dong Wu was an idler, and he had nothing to do!

If the future Heavenly Court wants to be completed, it will take a while, Dong Wu is not in the mood to wait slowly, so he simply takes advantage of this time to retreat and practice the Dinghai Divine Bead, since this thing has been obtained, I haven't studied it well!