Maybe others don't know the meaning of this "Ring of Freedom" (low-level), but Mu Feng understands what he is most afraid of in the last days? That is, their own things or weapons can be stolen at any time, whether they are evolutionaries or other non-humans, they also need to rest, and they can't look at their things all day.

And in the last days, people's hearts are unpredictable, and no one knows if someone around them will suddenly steal their things, but it is different with the "Ring of Freedom", at least Mu Feng no longer has to worry about his things disappearing inexplicably, and he can also use this ring to protect some important materials.

Secondly, after three days of the end of the world, there is no signal for mobile phones and telephones and other communication devices, and it is difficult to contact the outside world! Even the military can only use radio to communicate with some undamaged satellite phones, but satellite phones do not necessarily work, mainly depending on whether the satellite signal pick-up base has fallen.

"As long as I have this thing, although it is not very useful in normal times, the effect it produces at a critical time is still very good, so that I don't have to run too far next time I wear a mecha!" Mu Feng said with a happy smile.

After playing "The Ring of Freedom" for a while, Mu Feng reluctantly put the mother ring into the backpack, and left the child ring to wear on the middle finger of his right hand.

At this time, Mu Feng tried to take out the "Laser Sword" first, and sure enough! Just when Mu Feng had this thought in his heart, a laser sword hilt similar to a flashlight appeared in the palm of his right hand, and then Mu Feng took the "Laser Sword" back into the character's backpack.

Mu Feng; "By the way, I also have an "Unknown Skill Book" (low-level), I'll open the class skill tree first to see what type of skill it is!"

"System, open the class tree function for me!"

"Didi! The system is opening ......"

……

The functions of the class skill tree are as follows;

types of battles; Fighting (Elite), Basic Knife (Master), Bursting Sword (Intermediate)

type of control; Mirror Clone (Intermediate)

Auxiliary type; not

type of defense; not

Passive type; not

Types of common sense; Firearms (Elite), Mechanics (Advanced)

type of life; not

Industrial type; not

type of study; Unknown Skill Book (Low)

the type of plan; not

type of production; General Knowledge of Mechanical Drawing Making (Intermediate)

predictable career skills; Fighting Skills (up to Master Level), Basic Knife Skills (up to Legendary level), Gun Use (up to Legend level), Mechanical Knowledge (can not be upgraded), Burst Sword (up to King level), Mechanical Drawing Making Knowledge (up to King level), Unknown Skill Book (up to Advanced level)

（PS； The class skill tree function can help the host classify skills, predict the limit of skill upgrades in advance, and "see" unknown skill book props! ）

The current version of the system ontology; God of War system version 2.01

……

"Huh? What is the type of study skill? It doesn't seem like the level limit is too high! ”

At this time, Mu Feng finally couldn't help frowning, at present, the highest level limit growth on his body is "Bursting Sword" and "Common Sense of Mechanical Drawing Making", followed by "Use of Firearms", and the skill of "Mechanical Common Sense" has reached the highest.

In other words, this unknown skill book is actually the same as "Mechanical Common Sense", but what the hell is that research type of skill? The industrial type of skills is still relatively easy to understand, it should belong to the skills of mechanical processing and item manufacturing, and the type of production may be some information about the item, just like "common sense of mechanical drawing making".

Planning-type skills should be able to improve the IQ of characters, right? For example, in the Art of War book or something, this plan does not necessarily refer to the plan that must be fought, but the steps that are made in order to accomplish something, this is the plan! It's just that Mu Feng has never heard of this kind of skill.

So, what are the skills of the research type? Industry can be associated with steel and all kinds of other materials, and the word research can make people think of chemistry and physics, so this skill should also be related to chemistry or physics.

"That's fun! I remember that in the last days, many enhancements and weapons were made without research, and the most important of them was the enhancement potions! It's better to be stronger on your own than to have super weapons, and I want skills about these potions more, and if not, it's a big deal to buy a skill in the system store again. ”

Thinking of this, Mu Feng couldn't help but feel a little heartache, he knew that he didn't need those wealth values, if he had those wealth values now, then he could have a few more character skills, but unfortunately Mu Feng didn't think of this just now, and it was useless to regret it now.

"Smack!"

Although Mu Feng was very heartbroken, he still took out the skill book and slapped it on his head, this is also the way to learn the new skill book, even Mu Feng remembered it after a long time, I have to say, this method of learning new skills is really very convenient!

"One Hundred Methods of Using Mutant Beast Crystals" (low-level); This skill grants the user knowledge about the use of mutant beast crystals, and the user can also copy this knowledge in their minds to others, up to a maximum of advanced levels.

"What is this—What is this? This thing can also be upgraded to advanced? I'll go, it's a big loss......" Mu Feng cried out with a sad face.

This newly acquired skill, in fact, Mu Feng doesn't need it at all! He already had a thousand ways to use the mutant beast crystal in his mind, so why bother to learn it? And after Mu Feng carefully checked the knowledge brought by this skill, he actually found that all the things in it were known to him......

That is, it is better to share knowledge with others later, at least to let others know how to use the mutant beast crystal, but other than that, I feel that this skill is simply a chicken rib ......, Mu Feng He is still looking forward to it, it seems that he has been put on a set by the system.

"Eh, forget it! Wait a minute, I'll share this knowledge directly with Xiaoyu and them, anyway, even if I tell them with my mouth, they may not be able to remember it! It's better to use this skill directly", and in this way, my mind is much more balanced. ”

Although Mu Feng was speechless about the skills he obtained this time, he had no choice, so he could only comfort himself like this, at least this skill was not useless, as long as Mu Yu and they knew how to use the crystals of the mutant beasts, maybe it would have a key role in the future.

The current Mu Feng also needs the mutant beast crystal, because his mecha energy is replenished by the mutant beast crystal, and at this time, his mecha energy has been exhausted, unless Mu Feng can find a third-level mutant beast crystal, otherwise, there is no way to use it for long just by relying on the second-level mutant beast crystal.

The time that Mu Feng could use the mecha before, it was about an hour and a half if it was full of energy, and it could only be used for half an hour when using the first-level mutant beast crystal, and the second-level mutant beast crystal could be used for an hour, and there was still time to replenish energy after use, which was very troublesome.

"I remember that the medium-sized giant mecha consumed energy faster, the first-level mutant beast crystal could only be used for twelve minutes, and the largest giant mecha could be used for six minutes! Well~, if you're lucky, you don't have to worry about energy. ”

Mu Feng was thinking about the energy consumption of the mecha, and at the same time took the laser sword to cut the corpse of the Golden Lion King, but the corpse of the Golden Lion King was very large, and Mu Feng also needed some effort to complete the dissection, if he accidentally destroyed the corpse, many of the things in it would be useless.

The most important part of the Golden Lion King's corpse is the bones, claws, animal skins, animal meat, and meridians, and the bones can be alloyed with steel, which is not only strong and durable, but also very sharp! Claws are best used for weapons and the like, and they can be welded together with steel to become Wolverine-like weapons.

Hides can be used to make soft armor, and they can also be used to make car covers, because the skin of the Golden Lion King has a high defensive power, and if it is a low-level mutant beast, it may not be able to break it, and it can also be used as a body armor, and the general pistol bullet can only make a small hole, and will not hurt the user's body.

As for the beast meat, this is not for Mu Feng to eat for themselves, after all, most mutant beasts have viruses in their bodies, and if they eat it, they will directly turn into zombies! The function of beast meat is to attract other mutant beasts, and other mutant beasts don't care whether this meat is a mutant beast king before it is born.

Finally, there are the meridians on the Golden Lion King, which is a good thing to make bows and arrows and ropes, and the bowstring of the bow and crossbow is made with the meridians of the Golden Lion King, which is more powerful than a pistol! It's just that the speed of the bow and arrow is never as fast as that of a bullet, but at least it is more powerful.

Therefore, the Mutant Beast King is full of treasures!

And Mu Feng took him almost ten minutes to complete the dissection, and those dissected things were put into the character backpack by him, and there was no air, bacteria, or viruses in the character backpack of the system, so Mu Feng didn't have to worry about whether it would rot.

"Okay, let's go down and go back to find Xiaoyu and them, if you don't go back, you will definitely be suspected by Murong Liushui."

After packing everything up, Mu Feng was turning around and preparing to go back, but at this moment, a figure suddenly ran in front of him! It's just that the figure seems to be seriously injured, running and stumbling, and his expression is still very nervous.

"I'll go, Ye Wuchen!" Mu Feng suddenly shouted in shock.

That's right! The wounded man, the guy who was running away, the guy with a nervous face, he ...... It's Ye Wuchen!

"Is that you?" Ye Wuchen also looked at Mu Feng with some surprise.

"What happened? How did you end up like this? ”

Mu Feng hurriedly ran towards Ye Wuchen, at this time, Ye Wuchen was no longer the arrogant and domineering appearance before, now the expression on his face was very tired, and none of the clothes on his body were intact, and even the sword in his hand was broken in half.

"Run!" Ye Wuchen immediately grabbed Mu Feng and shouted loudly.

Mu Feng, who was caught by him, didn't understand what was going on, but Ye Wuchen, this guy, he immediately took Mu Feng and started to run like a fly......

However, just after they left, a human arrived!

He ......, it's Zhang Xueyou!

"Have you already run away? It's really fate......" Zhang Xueyou said expressionlessly as he looked at Mu Feng and the direction they left.