Inside Ice Valley City.

On the street, Knight Kader was leading the team to kill the snow monster. Deputy Captain Bray cooperated with him perfectly and successfully killed a snow monster that was transformed from a low-level knight.

"Bree, do you feel that the number of snow monsters in Ice Valley City seems to have decreased visibly recently?"

Knight Kader said.

Bray nodded after hearing this. "Indeed, at the beginning, it seemed that we could encounter snow monsters just by walking a few steps. We didn't need to take the initiative to look for them. But now, we actually need to take the initiative to search for them. This doesn't make sense. Could it be that all the snow monsters in this city have gathered in Lanyu Castle?"

Kader frowned slightly: "It's possible."

However, the image of the white wolf flashed through his mind.

During these ten days, they never encountered the white wolf again.

He felt that the decrease in the number of snow monsters in this marginal city area might also be related to the white wolf.

The two fully-armed knights, equipped with extremely pure mithril swords, may be as efficient as their demon hunting team.

After ten days of cleaning, they had basically cleared out the snow monsters in the marginal areas and rescued many survivors.

The rescue operation went much more smoothly than Kader had imagined.

Because in the entire edge city area, the number of snow monsters was far lower than he expected.

This is good news for Knight Kader.

But it is a bad thing for many wandering knights.

Many wandering knights have not killed a single snow monster since they set out. On the one hand, it is because their strength is too weak, and on the other hand, they have basically not encountered any snow monsters along the way.

If they encountered a few scattered ones, they would be killed by the strong ones in the team, such as Deputy Captain Bray.

Frozen Heart, it’s not their turn at all.

"Captain, why don't we go inside?" someone complained.

"If you want to die, you can go in by yourself. The danger deep in the city is far beyond your imagination. Even a great knight may die if he goes in. Who gives you the confidence to go deep?" Kader angrily scolded the wandering knight, and the latter shut his mouth.

Kader sneered in his heart. If it weren't for the two great knights who helped them clear out a large part of the snow monsters on the edge of the city, then this team of two hundred people would have suffered more than just twenty deaths in these ten days.

His primary goal now is to bring back as many survivors as possible, so he doesn't want to get into trouble and go deep into the city.

The probability of there being survivors deep in the city is very small, so there is no need to take the risk.

"Such a strong man appeared in the Kingdom of Eternal Night. I have to report to the Queen after returning." Knight Kader thought to himself.

The queen of the Kingdom of Eternal Night is a rare female knight in the world. She likes to recruit strong men under her command and make friends with heroes from all walks of life.

Kader felt that the queen would be very interested in the White Wolf and the great knight beside him.

I hope the two of them don’t die in this Ice Valley City.

…

Deep in the city, the armored demon shark rushed towards the front like a war machine.

Although the Demon Shark's sword is not as good as Levi's Frostmourne, the mithril content in it is also one-tenth, far exceeding the swords of those demon hunters.

Therefore, the efficiency of the magic shark in hunting snow monsters is very high.

These days, in order to save his energy, Levi has not done anything.

Although there was three months' worth of food energy stored in his whale sac, due to the previous battles and consumption, ten days had passed and now only one and a half months was left.

If there is a major war, we won’t be able to last more than a month and a half.

But he had run out of food long ago, so after he reached the fifth level of Hell Seal, he no longer fought on his own, but used the Magic Shark to kill monsters. He only served as the Magic Shark's pendant, picking up the Undead Cores from behind.

[Hell Seal Mastery +1]

[Hell Seal Mastery +1]

…

Levi——

Seal of Hell: Level 5 (2456/20000)

…

So far, Levi has killed more than four hundred snow monsters.

According to the intelligence he had obtained previously, in ten days, he reduced the number of snow monsters in the city by about one tenth.

This efficiency is simply terrifying.

I am truly an army by myself.

“It’s so cool.”

"Mowing the grass is unparalleled, it's so cool!"

But it's a little different from Levi's plan.

The fifth level of Hell Seal is not the limit.

Originally, he planned to kill some snow monsters after reaching level five and then go back.

Now I can only continue to gain experience here.

Fortunately, we have great knights like the Demon Shark, and their efficiency is quite good.

"Once we get to the depths of the city, if I can find some food to replenish myself, I can continue fighting."

"It feels really good to be a necromancer, even though I'm only a half-baked necromancer." Levi felt happy.

When he plays games, his favorite style is the armor stacking style.

The second is the summoning flow. When playing dark games, I like professions like Necromancer.

Summoning flow, highlight one word: cool.

"What a pity! I still have three summoning slots, but there is no body of the Great Knight." Levi said a little regretfully.

"After I kill the Duke of Montenegro, I will make him my living dead and make him do the dirtiest and most tiring work every day."

"And Pale Shadow, don't even think about running away. Sooner or later, I will turn him into a living dead as well."

Levi wants to make his enemies work like his slaves forever, so that they can experience the blessings of being social animals!

Levi's vacant summoning position is prepared for his enemies.

"Keep grinding. No matter what, I'm going to grind Hell's Seal to the limit! If you miss this opportunity, you won't be able to get it again."

Levi thought to himself, it was not easy to come to the Kingdom of Eternal Night, so he certainly couldn't waste this opportunity.

Five days later.

"298."

"299."

"300."

Levi's face was calm. He followed the demon shark with full concentration, watching the demon shark kill everyone with its Frostmourne.

After replacing the magic shark with its own weapons, its efficiency increased a lot, at least three times.

Next to the big demon shark in front, there are three freshly-baked "living dead".

These three zombies are very weak and just follow the Demon Shark as a supporting role.

These three living dead were some wandering knights who had been causing trouble for Levi without knowing the consequences during this period.

Levi summoned them out purely to quickly gain proficiency in the Seal of Hell.

He now has a lot of undead cores on him, but if the Demon Shark is alone, the amount consumed is far less than what Levi obtained.

This also means that the speed of gaining proficiency in the Seal of Hell is too slow. After all, only the Demon Shark is earning proficiency for Levi.

So Levi could only turn the corpses of these few, whose strongest were only of mid-level knights' strength, into living dead and use them to increase the speed of his proficiency.

This effect is also immediate.

Even though these guys are weak, they provide a lot of proficiency.

So Li Wei's liver growth rate increased several times at once.

The 300th snow demon appeared along with the one killed by the magic shark.

Levi's Seal of Hell has been upgraded again.

Levi——

Seal of Hell: Level 6 (1/40000)

…

"It's not the limit yet? It's already level six..."

"It's unbelievable that my current level of Hell Seal has even surpassed that of the ancestors of the Constantine family..."

"To be honest, the difficulty of practicing the seal is much easier than the breathing method. It is just limited by the lack of spell materials. Otherwise, practicing the seal is really not difficult."

Levi felt calm since level six was not the limit.

Then he just continued to work hard and he didn't believe it.

Can this seal be used continuously?

That would be amazing if this seal could be mastered to level 10,000.

Summoning ten thousand zombies, would any wizard shake their head when seeing this?

So he felt that there was still an upper limit to the power of this seal.

"Perhaps level seven is the upper limit."

"Let's work harder for a while. Anyway, I reserved a month for myself, and only half a month has passed."

Levi thought to himself.

After leveling up the Seal of Hell to the sixth level, he now has six summoning slots.

Now you can add a new cannon fodder.

So along the way, he would pay special attention to whether there were any zombie corpses that could be used.

Before he knew it, Levi had already gone deep into the inner city.

"As long as we don't go into the castle for the time being, it should be safe."

Levi muttered to himself as he felt the sense of danger coming from his spider sense.

In the end, Levi did not find the knight-level body.

We can only temporarily use the corpses of ordinary people to make up the numbers.

Anyway, I don't expect them to fight, they are just there to gain experience for myself.

Moreover, to be honest, even if Levi was given six great knight-level zombies, he felt that he might not be able to control them.

Driving the living dead is not completely free of energy for the master, as it does consume mental energy.

Mental power is illusory, but it does exist.

A wizard is someone who practices spiritual power, but Levi is not a wizard now.

But with his status as a great knight, his mental strength is definitely higher than that of ordinary people.

He made a rough estimate based on his current mental strength.

At most, he can control five zombies at the level of great knights.

If one wants to completely control the six-headed zombie knights, one should at least reach the level of a top-level knight.

Time flies, and another ten days have passed.

It has been twenty-five days since Levi came to Ice Valley City.

The monster hunting team had already returned with the kingdom's citizens who were rescued this time. Because Levi was constantly clearing monsters in the front, Knight Kader's rescue operation went smoothly.

The only ones who are unhappy are probably those wandering knights.

They originally wanted to get some Frozen Heart in exchange for bounty.

As a result, many people failed to kill even a single snow monster in the end.

Although they boasted about their ability, no one dared to actually go deep into the city.

After seeing a few unbelieving wandering knights being torn into pieces in a few seconds by dozens of snow monsters that suddenly appeared, they became completely obedient.

Levi has already arrived at the outskirts of Blue Feather Castle.

He looked at his proficiency panel.

Levi——

Hell Seal: Level 6 (30000/40000)

…

"Damn it, it was so close, but in the huge Ice Valley City, apart from the scattered snow monsters in various districts, there was no sighting of them at all."

Up to now, the number of snow monsters killed by Levi has reached thousands.

According to the information Levi obtained, there are no more than three to four thousand snow monsters in Ice Valley City.

"We still need 100. It would be too slow to look for them one by one in other places. How about we try inside the castle?" Levi looked at the towering ancient castle.

As the Duke's castle, Lanyu Castle is very magnificent.

The buildings inside are densely packed, and it is basically a small city within a city.

The black castle was like a dormant beast, sleeping in front.

The roars of a large number of snow monsters can be heard inside.

Levi took out all the undead cores from the bodies of those cannon fodder zombies.

"We don't need them anymore, and keeping them might do harm."

Levi brought the magic shark with him, and he came to the wall of Lanyu Castle with a light figure.

Then he gently touched his palm to the wall.

Using his advanced vibration perception, he could sense the movements within the castle.

The range of his advanced vibration perception is now thirty meters in radius.

So he wanted to see how many snow monsters there were within a radius of thirty meters with himself as the center, so as to estimate the density of the snow monsters and then decide whether to go in.

"Five."

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

"We can give it a try, or we can send a few cannon fodder into the castle to lure some out."

"I'm afraid I'll accidentally lure out all the snow monsters in the castle, and then I'll have no choice but to run away."

Levi was making a decision in his mind.

Finally decided to give it a try.

He injected the core of the undead back into the body of a mid-level knight-level zombie.

Let the undead slip in through the broken gate of the castle.

Not long after, Levi felt that there seemed to be a snow demon attacking the zombie, so he quickly controlled the zombie to slip out.

Then Levi saw a group of snow monsters chasing the zombies. When they reached the door, they stopped, wandered for a while, and then went back.

"What's going on?"

Levi was a little puzzled as to why these snow monsters didn't leave the castle.

He didn't believe it, so he tried again with other zombies.

He even let the Demon Shark try it, and found that the zombies would not come out after chasing to the door.

Levi pondered for a moment, then used the grappling hook to climb up onto the city wall, secretly poked his head out and looked inside.

There were snow monsters everywhere in the castle, and the deeper into the castle, the denser the snow monsters were.

No wonder we can’t find the snow monsters outside, it turns out they are all concentrated here.

Under the tallest building in the castle, which might be the high tower of the Duke's residence, there were hundreds of snow demons gathered, all wearing light blue feather armor.

"This seems to be a transformed snow monster from the army under Duke Lanyu."

Levi also discovered that there were more than a dozen knight-level snow monsters roaming around, whose aura and clothing were clearly different from those of ordinary snow monsters.

"There are twelve of them. The weakest one is at the mid-level knight level, and the strongest one is at the peak knight level."

"No, there's another one." Levi suddenly saw a huge snow demon whose size was no less than that of the magic shark. His body had rotted away, leaving only bones, but he was still patrolling the castle diligently.

"There are thirteen knight-level snow monsters, and even one great knight-level one. No wonder no one dares to come here."

Levi knew that an ordinary great knight would hardly be a match for the great knight-level snow demon unless he possessed a high-purity mithril sword like his and extraordinary endurance.

Because the snow demon not only has physical fitness that is not inferior to that of the great knight, but also has no weaknesses, is immortal, fearless, and has mastered the combat skills before the great knight, making it extremely terrifying.

Only I can deal with such a monster.

"If it's just this big knight, he shouldn't give me the same sense of danger as my spider sense. Could there be other dangers in this castle?" Levi observed the situation, hesitating whether to rush in.

He currently still needs one hundred Undead Cores to upgrade the Seal of Hell to the seventh level. In addition to that, he also needs to stockpile a few hundred Undead Cores for his own future use.

It now seems that most of the remaining snow monsters in the city are in this castle. If we don’t go in, it would be a waste of time to look for those scattered ones in other places.

"When you have enough undead cores, withdraw. Never fight to the end."

Levi finally made a decision.

"I have extraordinary defense, extraordinary endurance, top strength, top speed, advanced perception, as well as artifacts such as the pure mithril Frost Giant Armor and Frostmourne, not to mention the four great seals. Although there is a certain degree of danger, I should have no problem protecting myself. I don't need to go too deep." Levi analyzed.

Prepare the spell materials, then take the magic shark and sneak into the castle.

He let the magic shark block in front, and if there was an enemy he was unable to defeat, he would let the magic shark sacrifice itself so that he could escape.

As soon as he entered, a snow demon noticed Levi.

At least dozens of snow monsters rushed towards Levi.

Levi brought the magic shark to the foot of a city wall.

This way he doesn't have to worry about enemies behind him.

"bring it on."

Levi was ready.

The Demon Shark turned into a killing machine, standing in front of Levi and using Frostmourne to kill everyone. Occasionally, some fish slipped through the Demon Shark's defense net, but were crushed by Levi's black hand and the undead core was taken out directly.

[Hell Seal Mastery +1]

[Hell Seal Mastery +1]

…

While fighting, Levi also estimated the remaining power of the Demon Shark based on his proficiency.

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

Replace the Demon Shark with a new Undead Core.

None of those snow monsters left the castle.

This made Levi even more confused. He didn't understand why these snow monsters were like this.

Logically speaking, snow demons have no sense of territory. They roam around everywhere, searching for any living creatures, just like locusts.

But the snow demon in the Blue Feather Castle seemed to never leave the castle.

"Is there some rare treasure in this castle?" Levi wondered.

"But I'm not interested. I just want to complete the Seal of Hell, take the Core of the Undead, and leave this damn place."

Levi suppressed his curiosity and greed, as that would only put him in danger.

It's better to proceed step by step until you max out the Seal of Hell.

In this way, relying on this method, Levi kept going in and out of the castle, using the magic shark to fight these snow monsters.

In just one day, the Demon Shark killed hundreds of snow monsters, and its efficiency was several times higher than that outside.

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

Levi——

Seal of Hell: Level 7 (Ultimate), Special Effect: Apostle of Hell

…

"Damn it, I've finally reached my limit!"