Time passed slowly under Lu Chen's hard training, and Lu Chen, who was focusing on training, finally upgraded the Giant Dog Summoning, Stone Skin Technique, and Summoning the Retreat Beast to level four after a month, which cost him three potential points, and after being promoted to level four, Lu Chen was no longer training B-level skills to summon the Escape Beast, and it was also facing the same trouble as the earth element, and it would not be able to control it if Lu Chen was promoted again.

At the same time, according to the predetermined goal, Lu Chen trained the dungeon technique, the giant dog summoned, and wanted to upgrade the two of them to the full level before the end of the remaining time.

Another twenty days flew by, and when Lu Chen was only a few minutes away from going out, he looked at the giant dog summoning at the fifth level in his skill bar, and the dungeon technique at the sixth level, even if he tried his best to train, but the proficiency required by the skills from level four to level six was too high, and even with the help of his talent bonus, he did not raise the level 1 giant dog summoning when he came in to level six.

However, the original fourth-level dungeon technique Lu Chen has been training for the past fifty days, and has upgraded it to level six.

After thinking about it, Lu Chen still used his potential points to improve his two skills, the last time he came to the space, Lu Chen had two potential points that he did not use, and with the eleven potential points obtained in the legend of the night, now there are thirteen potential points in Lu Chen's hands, and the potential points can be removed and accumulated to directly improve the skill level, but the higher the level, the more potential points need to be consumed.

It takes one point to upgrade from level three to level four, two points for each level to upgrade from level four to level six, and four points to upgrade from level six to level seven, thinking about it for a while, Lu Chen still spent two potential points to upgrade the giant dog summoning to level six, and then used eight potential points to upgrade the giant dog summoning and dungeon technique to level seven, which is also the top of these two C-level skills.

When adding the eight potential points and upgrading them to the top level, two images suddenly rose in Lu Chen's mind, one was an earth prison on the earth rising out of thin air, standing on the earth and being unbreakable.

The other is underground, endless resentment rises, merging with the soil on the ground, forming a bloodthirsty wolf-walking monster, these two pictures have remained in Lu Chen's mind for a long, long time before disappearing, and it was so long that Lu Chen felt that a month had passed before the two pictures gradually dissipated.

In reality, after Lu Chen added potential points, he also stood in place for a long time, but after only five minutes, he shook his whole body and woke up, and Lu Chen, who came back to his senses, looked at it, he was still in the training space, and he was not ejected by the space.

This situation made him understand that time had not passed long, his time in the training space was almost expired, and the space would not give him politeness, and when the time came, he would definitely be ejected.

Not long after discovering that the time had passed, Lu Chen thought back to the two pictures just now, but this time he couldn't recall them, and after thinking about them for a while, Lu Chen understood that those two pictures should be the perception of using potential points to upgrade skills, as for feeling the long time, it may be because the sense of time in consciousness is confused.

However, for such a long time, Lu Chen did understand something from those pictures and understood the essence of these two skills, the most important thing in the dungeon is tenacity and unbreakable, summoning giant dogs is different from common earth skills, most of the common earth skills show tenacity, vigor, and show the broad side of the earth, while the skill that integrates resentment shows the murderous side, showing the resentment buried under the earth.

The same is true for the performance of these two skills after they are upgraded. The full-level dungeon has changed from a railing-type cage to a stone dungeon with walls on all sides, and the stone dungeon that has been upgraded to the full level can weaken the enemy's strength after trapping the person, and the enemy in the stone dungeon will bear double the gravity.

This should be affected by Lu Chen's magnetic ability, and Lu Chen also discovered one thing after the skill was upgraded to the full level, although it is the same skill, but after upgrading to the top level, everyone's skills are different, and the skills will adapt to their own system after upgrading to the full level.

In other words, if you don't use potential points, only after making the skills familiar with your own power system and integrating them into your own understanding, will the skills be upgraded to the top level, and the potential points can speed up this change, which makes Lu Chen more interested in potential points, and wants to know what kind of thing it is, which can make skills change like that.

However, the current Lu Chen's authority is too low, and he can't ask anything, so he can only keep this question in his heart and look at another skill that has been upgraded to full level.

Giant Dog Summoning, after the Giant Dog Summoning is upgraded to the full level, the strength of the summoned Giant Dog has increased, and it is already a whole body of stone, but the strength of a single one is still not too strong, and it cannot be compared with the earth element, but the Giant Dog Summoning is not wasted when it is upgraded to the full level, and the seventh-level Giant Dog Summoning can already summon eight Giant Dogs at one time, plus Claire's ring (the number of summoned Giant Dogs has doubled).

Now Lu Chen summoned 16 giant dogs at a time, and the 16 giant dogs cooperated with each other, and they did not show weakness compared to the earth element, and compared with the earth element, they may not have absolutely strong strength, but their speed is not too slow, and there is no weak one, with their containment and the main attack of the earth element, Lu Chen's strength has not increased a little bit.

For Lu Chen, the only bad news is that although the number of giant dogs summoned is large, the spiritual power consumed makes Lu Chen have a little headache, although Claire's ring can double the number of giant dogs, it can't subtract the spirit that needs to be consumed to summon giant dogs, and the remaining part of the giant dogs still need to consume Lu Chen's spiritual power to summon.

However, for a C-level equipment, Lu Chen can't ask for more, and it is precisely because of the equipment that matches the giant dog skill that Lu Chen gives priority to upgrading the skill of giant dog summoning, even if it costs a lot of potential points for this, it is not worth it.

In addition to these two skills that have been upgraded to full level, the defense of the stone skin blessing that has been upgraded to level four is stronger, and it has become impossible for ordinary sword and sword attacks to break through the defense of that layer of stone skin.

However, correspondingly, the agility of people who have been blessed with stone skin techniques has also been greatly affected, and they can no longer do soft movements on the surface of the stone, purely as a blessing skill, this is a pros and cons, but for Lu Chen, who has clay control, this skill is the most suitable for him.

PS: The results of the book are good or bad, and the brothers beg for tickets.