During meditation, time flies, and in a blink of an eye, half a day passes. The spiritual power consumed by Locke was also completely recovered in this small half-day meditation.

With his mental strength restored, Locke would naturally continue to study retardation. The original first-level undead creature had already disappeared into the vast world realm from afar, and it also took dozens of seconds for Locke to find a new target again, which was a zero-level skeleton warrior.

Locke also tossed this zero-level undead creature for several hours, until his own spiritual power was exhausted again, and then he let the other party go.

As time passed, Locke repeated yesterday's content over and over again.

The mental power was exhausted again and again, and it was restored again and again. One low-level undead creature after another was tested by Locke in front of them, and then let them go.

The Sluggish spell is much more difficult to master than the Bone Shield. It took Locke less than ten days to comprehend the White Bone Shield, and it had been more than ten days since he practiced and studied the Retardation Technique, and he still didn't succeed in casting a spell once.

Fortunately, Locke's spiritual power at this time was much stronger than when he was at the second level. Otherwise, if a second-level undead creature studies the Retardation Technique, it will exhaust its mental power after studying it for more than ten minutes, and it will take even more time.

Another undead creature appeared in front of Locke, and this was Locke's thirtieth test.

Again and again silently reciting the Slowness Mantra, again and again failed.

Finally, when Locke performed the retardation technique again, although the undead creatures in front of him did not have any special reaction, Locke knew that he had successfully released the retardation technique.

Because, at that moment, Locke sensed not only the consumption of spiritual power, but also the consumption of the undead magic power in his body. Although the little undead magic consumed by Locke was replenished in an instant, Locke, who was sensitive, still found himself successful.

Then the undead creature began to be unlucky.

Locke drove the undead creature to run, and kept mad at it.

As he ran, the undead creature fell to the ground from time to time. After all, it is only a zero-level undead creature, and sometimes if it falls suddenly, it will also hurt the bones and joints on its body.

In fact, most of the reason why this undead creature fell from time to time was not because of Locke's retardation, but because the ground was not even enough. Locke, who had just been able to unleash the Retardation Technique, had not yet mastered the Retardation Technique, and only a very small number of the Retardation Technique could be applied to this undead creature.

In the end, Locke, who had been tossing for several hours, let go of this undead creature that was only level zero, and at this time, the undead creature was already covered with scars.

In the time that followed, low-level undead creatures suffered the same plot as this unlucky being.

In the continuous casting of spells, Locke gradually became familiar with the use of the Slowness Technique, and perfected the initial deficiencies.

And Locke also discovered the effect of retardation on undead creatures. With Locke's fourth-level strength, the sluggishness technique can greatly affect the zero-level and first-level undead creatures, and for the third-level undead creatures, the impact of the retardation technique is not great, and Locke believes that in the battle with his own level or with the higher-level undead creatures, the retardation technique may not be able to play a role at all.

In fact, it is understandable that retardation can be compared to an anesthetic, which can affect the body, nerve response, and even the soul of living beings. For normal living creatures, the effect is naturally not small, and the undead creatures have no flesh and blood at all, only soul fire, and the retardation technique can only affect the soul fire, and the effect is naturally not as big as expected.

It has taken Locke more than a month to learn and study retardation to master retardation.

Mastering the Slowness Technique for such a long time was already extremely rare for a fourth-level undead creature.

More than a month later, Locke was already able to encounter third-level undead creatures from time to time.

Locke believed that some of the fourth-level undead creatures had already been born in this area. However, Locke was not in a hurry to find and kill the fourth-level undead creatures, after all, there were not many fourth-level undead creatures now, at least Locke hadn't encountered any of them these days.

It would be a waste of time to act now, and Locke planned to wait for a while, and when the number of fourth-level undead creatures appeared, he would be able to find the fourth-level undead creatures more easily.

Anyway, now that Locke has mastered the art of retardation, but he has not yet mastered the art of weakness, it will take time to study the art of undead magic weakness.

The Weakness Technique is a more complex undead magic than the Slowness Technique, and when Locke was promoted to the third-level undead creature, after discovering its complexity, he didn't pay attention to it, but at this time, Locke had to sort out the information and knowledge about the Weakness Technique.

Similar to the Slowdown, the Weakness Technique is also a curse-type undead magic, and it has a greater effect on the living, and is less effective on undead creatures than the Slowness Technique.

With the experience of comprehending the art of retardation, Locke is naturally familiar with how to master the art of weakness.

After learning about the inheritance, Locke returned to the state he had been in a month ago and continued to look for low-level undead creatures to study the art of weakness.

......

When Locke was studying necromancy near the Sea of Skulls.

The news of the appearance of the Sea of Skulls began to spread slowly around. There were many mid-level undead creatures with a certain amount of wisdom around, and they rushed towards the vicinity of the Sea of Skulls one by one.

Although these mid-level undead creatures are not able to make complex reasoning and thinking, they also know that the more undead creatures there are, the faster they can improve their strength.

The appearance of the Sea of Skulls naturally made it even more impossible to conceal the existence of the nearby lord-level. After all, the wisdom of lord-level existences is extremely high, and a large number of low-level undead creatures have suddenly emerged in their own territory, and they can naturally find abnormalities, as long as they inquire a little, they will know the origin of these low-level undead creatures.

After the appearance of the Skeleton Sea of Zhilu Dao, it was impossible for a lord-level existence to let go of such an excellent opportunity.

The infinite birth of undead creatures will inevitably give birth to a large number of lord-level existences.

In other words, these lord-level beings were able to obtain enough lord-level soul fire devouring to easily break through the current level and go further.

As for how to obtain lord-level soul fire, these high-level undead creatures naturally knew the process for a long time.

Lord-level beings are able to sign servant contracts with low- and medium-level undead creatures, thus cultivating lord-level contract minions, and then devouring their soul fire.

One after another high-level undead creatures appeared near the Sea of Skulls.

These high-level undead creatures have similar and different categories, most of them are skeleton-like undead creatures, and their forms are also different.

There are many types of skeleton warriors, skeleton mages, skeleton creatures in the form of monsters, black knights, zombies, and more.

These undead creatures are all lord-level beings, and they all have some contract servants to a greater or lesser extent. When they appear near the Sea of Skulls, their first choice is to summon all of their contract minions, and if the number of contract minions is insufficient, they will find new undead creatures near the Sea of Skulls to sign more minion contracts to expand the number of contract minions.

For lord-level beings, their own contract servants are the main source of their own soul fire. Although at this time, the strength of the contract minions is still low, but the intelligence of the undead minions is slightly higher than that of the same level of existence, so the actual combat power is slightly stronger than that of the undead creatures of the same level.

In this way, these contract servants are naturally more likely to advance than other free undead creatures.

Moreover, the lord-level existence does not need to worry about the loss of his contract servants at all. Because some of the undead creatures in the undead plane are mid- and low-level undead creatures, high-level undead creatures can find new contract servants at any time.

On this day, Gregory the bone dragon also learned of the appearance of the Sea of Skulls, just like other lord-level beings.

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