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Levi took out all the Cores of the Undead from the corpses.

“We don’t need them anymore. Keeping them might ruin things.”

Levi brought Magic Shark with him. His figure was light as he arrived at the city wall of the Bluefeather Castle.

Then, he gently touched the wall with his palm.

He used his Advanced Vibrosensing to sense the movements in the castle.

The range of his Advanced Vibrosensing was thirty meters.

Therefore, he wanted to see how many Snow Demons were within a 30 -meter radius with him as the center. He tried to estimate the density of the Snow Demons and then decide whether to enter.

“Five.”

“It’s not high, but it’s not low either.”

“We can try it or send a few cannon fodder to lure some out of the castle.” “I’m worried I may accidentally draw out all the Snow Demons in the castle.” In the end, he decided to give it a try.

He injected the Core of the Undead into the body of a mid-level knight living dead.

He let the living dead slip in through the broken castle gate.

Not long after, Levi felt that there seemed to be Snow Demon attacking the living dead. He hurriedly controlled the walking corpse to slip out.

Then, Levi saw a bunch of Snow Demons chasing after the living dead. When they reached the door, they stopped. After wandering around for a while, they went back.

“What’s the situation?”

Levi was a little puzzled. Why did these Snow Demons not leave the castle?

He did not believe it, so he switched to another living dead and tried again. He even let the Magic Shark give it a try and found that those living dead chased him to the door and never came out again.

After pondering momentarily, Levi climbed up the city wall with a grappling hook and sneakily peeked inside.

Snow Demons were everywhere within the castle, and the deeper one went into the court, the denser the Snow Demons were.

No wonder they could not find Snow Demon outside. They were all gathered here.

Hundreds of Snow Demons had gathered under the tallest building in the castle, which could be the tower of the duke’s mansion. They were all wearing light Bluefeather armor.

“This seems to be the Snow Demons mutated from Duke Bluefeather’s army.”

Levi also discovered more than ten Snow Demons of the knight level, whose aura and clothing were different from ordinary Snow Demons, wandering around.

“12 of them. The weakest is at the level of a mid-level knight, and the strongest is at the level of a peak knight.”

“No, there’s still one more.”

Levi suddenly saw a giant Snow Demon whose body size was not inferior to that of a Magic Shark. His entire body had rotted so that only bones were left, but he was still patrolling the castle professionally.

“13 Imight-level Snow Demons, and even a grand knight-level one. No wonder no one dares to come here.”

Levi knew that unless an ordinary grand knight had a high-purity mithril sword and Transcendent Endurance like his, it would be tough for them to be a match for a grand knight-level Snow Demon.

This was because not only were the Snow Demons as strong as a grand knight, but they also had no weaknesses. They were indestructible and unafraid of death. They had also mastered the combat techniques of grand knights, making them highly terrifying.

Only he could deal with such monsters.

“If it’s just this grand knight, he shouldn’t give me the same sense of danger as the Spider Sensing. Are other dangers in this castle?” Levi observed the situation and hesitated whether he should charge in.

He currently lacked 100 Cores of the Undead, which could allow him to make level 7 of Seal of Hell. In addition, he also needed to store hundreds of Cores for his future use.

Most of the remaining Snow Demons in this city seemed to be in this castle. If he did not go in, looking for those scattered elsewhere would be a waste of time.

“Retreat once you have collected enough Cores of the Undead.”

Levi finally made his decision.

“I have Transcendent Defense, Transcendent Endurance, Top-tier Strength, Top-tier Strength, Top-tier Perception, and divine artifacts like the pure mithril Frost Giant Armor and Frostmourne. Not to mention, I have trump cards like the four great seals. Although there’s a certain degree of danger, it shouldn’t be a problem for me to protect myself. I don’t have to go too deep,” Levi analyzed.

After preparing the casting materials, he brought the Magic Shark into the castle.

He let the Magic Shark block in front. Once there was an enemy he could not defeat, he would let the Magic Shark sacrifice himself and let him escape.

As soon as he entered, the Snow Demons noticed Levi.

At least a dozen of them charged toward Levi.

Levi brought Magic Shark to a city wall.

This way, he would not have to worry about enemies behind him.

“Come on.”

Levi was already prepared.

Magic Shark transformed into a killing machine and stood before Levi, using Frostmourne to kill in all directions. Levi’s black hand would occasionally crush some of them who slipped through the Magic Shark’s defensive net, and their Cores would be taken out.

[Seal of Hell Proficiency +1]

[Seal of Hell Proficiency +1]

As Levi fought, he estimated the Magic Shark’s remaining battery based on his proficiency.

Once the battery was almost exhausted, he sneaked out of the castle with Magic Shark.

He replaced Magic Shark with a new Core of the Undead.

None of the Snow Demons left the castle.

This puzzled Levi. He did not understand why these Snow Demons were like this.

Logically speaking, Snow Demons had no sense of territory. They wandered around, searching for any flesh and blood creatures like locusts.

However, the Snow Demons in Bluefeather Castle seemed not to leave the castle.

“Was there some kind of treasure in this castle?” Levi pondered.

“But I’m not interested. I only want to cultivate the Seal of Hell, take the Core of the Undead, and leave this d*mn place.”

Levi suppressed his curiosity and greed, which would only endanger him.

It was better to fill up the Seal of Hell steadily.

Just like that, relying on this method, Levi kept going in and out of the castle, using Magic Shark to fight Snow Demons.

In just one day, Magic Shark had killed over a hundred Snow Demons. Its efficiency was several times higher than outside.

On the third day, Levi’s Seal of Hell finally broke through again.

[Seal of Hell: Level 7 (Maximum), Special Effect: Hell Apostle]

“D*mn it; I’ve finally reached my limit!”