After returning to the sacrifice hand, Xu Ziye realized how many elves he sacrificed. The 397 mentioned earlier were just an imaginary number.

The correct number should be 50 5-star strength, 200 6-star strength, 110 7-star strength, 35 8-star strength and 2 9-star strength elves.

These elves can exchange negative energy creatures of the same level one-to-one with the negative energy plane, and this time the creatures can be optional.

At the same time, those materials were also calculated. If Xu Ziye's past materials were replaced by negative energy creatures with 7-star strength this time, they would be able to exchange for nearly 400.

This is already all the power that a large country can bring out. Even if it is a negative energy plane, it is difficult to provide this. After completing this transaction, there is a time when they need to fully digest what they get this time.

At the same time, it has been clearly stated that the exchange of materials can only be exchanged to 7 stars, and ordinary soldiers above 8 stars have no way to give Xu Ziye. However, one of them is 10 stars, but all the materials can only be exchanged.

Xu Ziye had never thought about the 10-star soldier. He hesitated for a moment and made a decision. In addition to the part exchanged with elves, he would exchange materials for 200 7-star negative energy creatures. Xu Ziye planned to soak the remaining materials with negative energy.

After passing his choice into the hands of sacrifice, Xu Ziye quickly received an echo from there.

Then the branches of the World Tree beside him, two barks, more than ten leaves, five perfect gems and ten transparent crystals flew up and fell into the hands of the sacrifice.

A large amount of negative energy surged out of the Sacrifice's hand and began to change the structure of these materials. In just a blink of an eye, all the things placed on the Sacrifice's hand turned into deep black.

Xu Ziye took a look and after confirming that the golden light, silver light and bronze light flashing in the original item were still there, he stopped saying anything, but carefully put away the things like negative energy essence.

Next, it is time for Xu Ziye to choose a negative energy soldier. There are actually not many choices for soldiers in the negative energy plane.

It’s better to have a low price. Some creatures that are eroded by negative energy can be used, but creatures that have reached more than 6 stars are not something that can be affected by ordinary methods.

All the 6-star-plus troops given here are capital accumulated over the years of development of the negative energy plane.

So for Xu Ziye, even if there are choices in this soldier exchange, there are not many choices. Each star rating can only choose one type of troops, which cannot be changed.

After seeing the few choices given by the negative energy plane, Xu Ziye quickly made a decision.

The best choice for 50 5-star soldiers. Perhaps for the Elf Expeditionary Force, 5-star soldiers are just auxiliary troops, but for Xu Ziye, 5-star soldiers are definitely the main force in the battles in the city now, so when there are not many people, there are some special combat methods.

The negative energy plane is quite generous in terms of 5-star troops, and gave Xu Ziye four choices. After seeing the situation of all troops, Xu Ziye chose something called negative ghost.

This type of military has two different states. When you don’t fight, it looks like a black skull. If it is not for the wrong color, no one will pay attention even if it is placed on the roadside of the Undead City.

But during the battle, it will turn into poisonous daggers and pierce directly into the enemy's body 10 meters away.

Of course, as a military force for this kind of sneak attack, it has restrictions. Dagger stabs can only be used three times a day, and it cannot be used after three times. When placed on the ground at the same time, it cannot move. It can only be used as a guard of a certain passage, and cannot have a great effect on the battlefield.

But what Xu Ziye wants is this. He intends to secretly change the architectural style of the Yiruo Ghost Domain and make tens of thousands of black skulls placed on the roadside as the base for street lights.

Then put these 50 negative ghosts in, let them monitor every move in the city and deal with the lurkers at night.

Of course, compared with these 50 5-star soldiers, Xu Ziye is more concerned about the 6-star soldiers. The difference between 5-star and 6-star soldiers is equivalent to the difference between heaven and earth.

The 5-star troops can be selected at will, but Xu Ziye cannot choose at will for hundreds of 6-star troops.

Among the 200 soldiers with 6-star strength, Xu Ziye selected a tree spirit unique to the negative energy plane. This tree spirit is called the Black Ghost Tree Spirit, and is a 6-star existence specialized in the negative energy plane.

When it is not moving, it looks like a big tree with ordinary black leaves, but when it moves, at least 10 or up to 100 fists will appear on the tree.

These ghosts hang on the branches like fruits, providing these black ghost tree spirits with the power of life and fighting.

In other words, this kind of black ghost tree spirit has a super defense that tree spirits should have, but also has a very long life and extremely fast life recovery speed.

The 200 black ghost tree spirits can definitely become a city wall outside the Iruo Ghost Realm.

The number of 7-star troops is relatively large, including those who exchange materials, there are 310. Xu Ziye considered his current needs and looked at the two troops that could be provided there, and finally made a choice.

The 7-star black giant spirit is an existence that looks like the God of Lamps. However, compared with the God of Lamps, they use darkness and negative powers. Generally speaking, the 7-star black giant spirit has two attack-like spells, and their melee ability is also quite good.

The most important thing is that each black giant can release two mirror clones. Although these mirror clones cannot provide any combat power, they can prevent them from being killed at the first time.

Next were 35 8-star soldiers. Xu Ziye selected 8-star negative energy elements for this soldier. This negative energy element looked like a magician wrapped in a black robe, but they were real warriors.

On the surface, they seem to have no face, usually hide three silver-white masks around them in their robes. When fighting, they will turn them into spears, swords and battle axes to attack all the enemies around them according to different situations.
Chapter completed!