Deserts were never formed in a day, in fact, thousands of years ago, there were also countries on this dead desert, but over time, these countries gradually died out, and the places where they lived were also covered by the yellow sand.

With so many ghosts and skeletons popping up all of a sudden, Roy guessed that this oasis might have been the place where some desert country had existed before, or else there was no explanation for why so many bones were buried underground.

However, the number of undead is too much, which is very unexpected by Roy, because according to what he knows, the undead generally need to rely on the power of death to spawn and awaken, under normal circumstances, the soul of the dead creature will dissipate, and the remains left behind will be gradually corrupted and decomposed, when there is no external force, these remains will only sleep quietly, otherwise, every war will cause a large number of undead to be born, so who would dare to fight?

And there are only two explanations for the birth of so many undead in the underground of this oasis, either there are necromancers or lichs who have awakened them with the power of death, or this oasis is located in a very special location, it is a place where the power of death can be condensed, in other words, this may be a netherworld!

Roy was of course inclined to the latter, as he looked through the radiation vision and found that there were no obvious sources of radiation around the oasis, except for Roy and Juliel and Fat Tiger, indicating that the undead were indeed self-generated.

Although there are a lot of them, they are all low-level undead such as skeletons and ghosts, and occasionally you can see a few mummified corpses wrapped in rotten bandages, such enemies pose no threat to Roy and them, at most they consume some more time.

With a wave of his hand, Roy used his magic power to create a huge ice storm, countless black ice picks poured down like a torrential rain, covering the entire oasis in it, these dense ice picks fell from mid-air, and smashed into the skeleton soldiers' bodies with huge kinetic energy, easily shattering them into piles of broken dry bones.

However, Roy had just eliminated a batch of skeletons, and a steady stream of bones were coming out of the ground, and it was unknown how many of these remains were buried under the ground of this oasis......

Watching this scene, Roy felt bored.

Therefore, it is not for nothing that demons hate the undead, these skeletons and ghosts will not have any souls left after they are destroyed, that is to say, no matter how much they kill, it will not be good for Roy, and these undead creatures without consciousness do not know what fear and fear are, as long as they perceive the breath of the living, they will rush up without fear of death, regardless of whether the enemy is strong or not, this kind of undead creature without the concept of dignity and inferiority, the more high-level demons hate them......

Juliel, who was next to her, sensed Roy's emotions and said, "Why don't you get entangled with these skeletons, let's fly away from here, I don't believe they can fly up and catch up with us." ”

Roy nodded, and was about to agree, but suddenly remembered something, and said to Juliel: "Wait, you clean up first, don't let them disturb me!" ”

Juliel didn't know what Roy wanted to do, but she nodded, she stood still, holding her sword in both hands to mobilize her magic, and then with a sharp swing, a fan-shaped black fire wave immediately surged out, spreading out forward, and all skeletons and ghosts that came into contact with this black flame were all burned to ashes.

Roy, on the other hand, crouched down behind Juliel, took Kassandra's soul from the system space, and then carved a temporary summoning magic circle on the ground with magical power.

Placing Cassandra's soul in the center of the magic circle, Roy began to summon Kassandra, a lich from far away in the Caribbean......

He didn't know if he could succeed, after all, it was a call across the world, but he had to try to find out.

Roy continued to output mana to maintain the summoning array, and he found that the mana consumed by such a summon was very huge, even if he was wearing a cold winter armor with ten times the mana recovery speed, he still felt a little unable to make ends meet, such a consumption was beyond Roy's expectations, but he could only try his best to maintain it now, because once the summoning was interrupted, it would fail.

Fortunately, when the magic power gushed out to a certain amount, the sky above the magic array finally reacted, and a black dot appeared, slowly spreading into a rotating vortex, which is the spatial gate of cross-world teleportation, which is very similar to the principle of the abyss gate.

When the spatial door expanded to a certain extent, a skeleton wearing a robe like a flower petal and a cold and dead aura on its body appeared from the door!

Roy was also relieved to see this figure, and he had summoned Kassandra to him.

"My lord, Kassandra has been summoned!" Kassandra the Lich saluted Roy respectfully, and then said in an excited voice, "I thought you had forgotten about me......"

Roy felt her breath and found that Cassandra's strength was much stronger than before, so he nodded and said, "Cassandra, now I need your help!" You've come at the right time! ”

"Yes, master!" Kassandra bowed her skull respectfully and said, "Command!" ”

"Don't worry, how strong is the world's rejection of you?" Roy asked her.

"It's not very strong......," Kassandra felt, "but the rejection remains, and I may only be able to stay in this world for two months......"

"Really?" Roy nodded thoughtfully.

Two months is a little longer than Roy expected, perhaps because the Caribbean world where Kassandra is located, the energy level is much lower than that of the Yashan world, and the repulsion power of the high magic world for foreign creatures has always been weaker than that of the low magic world, and creatures like Roy who have strong magic power can even resist this repulsion effect through their own strength, so as to achieve the purpose of staying for a long time.

Kassandra was able to stay in this world for two months, indicating that her own magic had improved.

But...... This was not enough, so Roy waved his hand, and a demonic contract appeared out of thin air, floating in front of Kassandra, Roy said: "Sign this demonic contract, so that you can use my magic to stay in this world for a while longer!" ”

"Yes, master!" Without the slightest hesitation, Kassandra stretched out her bony palm and pressed it against the contract.

A burst of black light flashed from the demonic contract, and Kassandra's name appeared in the contract, and the demonic contract was established! Then vanished into thin air.

And the moment the contract was made, Roy felt that some of his magic power had been extracted out of thin air and channeled into Kassandra's body.

"Master!" Kassandra looked at Roy with empty eyes and said admiringly, "From your magic, I can feel that you are more powerful now than the last time you left......

"Hmm!" Roy nodded and said, "Let's wait a while, do you see those undead in the back?" All you have to do is find a way to control them and make them work for you! Can it be done? ”

Yes, this is Roy's purpose, because anticipating the possibility of large-scale war in this world, Roy originally thought of summoning some low-level demons from the abyssal world to serve as an army, but after seeing these undead, Roy suddenly changed his mind.

No matter how much he exploited those low-level demons, Roy always had to pay some souls as a price, even if he was a high-level demon, he couldn't break this kind of rule, but it would be different if he used these undead as an army.

There is no need to provide food and drink, and there is no need to pay for souls, except for the slightly weaker combat power, the undead creatures are simply the best army, even if Roy hates these undead, he can't deny this advantage.

It's just that Roy is a demon, not a necromancer, and he can't control these undead, but it's different after summoning Kassandra, and the lich is a natural necromancer!

It's also a bit funny, Roy's demonic blood can create lichs, but he can't control the undead himself, so he can only indirectly create an army of death through this method......

"Slavery of the dead!"

After receiving Roy's order, Kassandra immediately turned around, and the ghostly undead fire appeared in her eye sockets, and an invisible wave centered on her body spread in all directions, and when this invisible wave swept over the skeletons and ghosts, the undead who were still rushing towards Juliel and Fat Tiger immediately stopped their movements.

Just as a higher-level demon can drive a lower-level demon, Kassandra, a high-level undead creature, can also drive low-level undead at will!

The skeletons and spirits were restrained in large numbers by Kassandra, who stopped their movements and remained quietly where they were, waiting for orders.

Juliel was amazed to see this, she had no idea that Roy would summon a lich......

Intrigued, Juliel walked back and stared at Kassandra for a moment.

As a result, Kassandra was quite clever, and immediately realized the identity of Juliel, a fallen angel, and bowed her head very respectfully and exclaimed, "Mistress! ”

Juliel was so pleased with her call that she immediately accepted Kassandra's presence.

Instead, the fat tiger stared curiously at Cassandra, looking left and right, and he always felt that Kassandra, who was covered in bones, was very tempting to him, and wanted to go up and lick it.

Kassandra also noticed the fat tiger's gaze, and shrank back in fear......

"Is it all under control?" Roy asked.

"There are six thousand nine hundred and twelve skeletons, and one hundred and twenty-four low-level ghosts, which is the limit of the number of undead I can control at the moment......," Kassandra replied.

The number of undead that the lich can enslave and drive is related to the lich's own magic power, the more powerful the magic power is, the more it can enslave, of course, it is also related to whether the enslaved undead creatures are strong or not, fortunately, the lowest-level skeleton soldiers and ghosts appear here, so Kassandra finally controlled the number of more than 6,000.

Glancing at the rest of the skeletons still emerging from the ground, Roy ordered Kassandra, "Very well, let these undead deal with the remaining undead!" ”

So, under Kassandra's control, the enslaved skeletons and spirits immediately turned around and killed their kind!

Roy, on the other hand, became light and began to watch the play on the spot with a smile......