I'm sorry everyone, I'm letting you plane again.

Today's birthday,I didn't remember it at all (I didn't want to face the fact of Ben San at all since the twenty-five),I didn't save the manuscript at all.,Just now the old sister called to say that everyone went out to eat together.,I can't help but go.,I had to ask for leave.。

Take a day off, update the chapter and make it up tomorrow, and at the same time wish the buddies and sisters who have birthdays on the same day a happy birthday! O(∩_∩)O~

***

Lin An felt like he had returned to the time when he was first introduced to magic.

Under normal circumstances, it would take three to five months to deduce a fourth-level spell based on 6 mana hours per day.

Lin An's spiritual power has reached the peak below the legend, and she can't go any further, so the time she needs naturally doesn't need to be so much, but it won't be less than two months, that is, more than 360 magic hours.

After level four, the difficulty of level five spells and level six spells increases exponentially.

With each level, the time spent is doubled compared to the previous level - that is, under the same conditions, the deduction time of a level 6 spell is usually more than 4 times that of a level 4 spell!

Even if Lin An retreated to deduce this spell without sleeping, it would take more than two months, not to mention that he could only maintain his daily cultivation progress now.

After estimating the time it would take to deduce the [Portal], Lin An had the idea of retreating.

At present, Lin An can spend about one magic hour a day on spell deduction, so it will take her about three years to fully master this spell.

"No wonder those old men and ladies have lived so long, but they are always in retreat, and they can't deduce spells without retreat!"

If they are all like her, it takes three years to master a spell, who can stand it!

The problem is that although there are more than 400 spells at levels 4 to 6 in the spell book, for Lin An's current situation, only the [Portal] spell is in the most urgent need, which can greatly increase her chances of surviving in the demonic disaster.

For this last point, the spell [Portal] is at the top of Lin An's list of spells to learn.

"Let's learn, the estimated time of the demon disaster is far more than three years, learn this spell, and the safety of me and Titi will be much greater in the future."

Considering the safety of the people around him, Lin An made up his mind.

Titi's flame teleportation can only take one person, and it is a short-distance teleportation, the farthest distance cannot exceed five miles, and the restrictions are also more harsh, if there is no ignited flame within five miles, it cannot be activated, so the main advantage of this spell is reflected in the battle.

William's shadow teleportation, not to mention, is simply a combat talent that can only teleport in the shadows within line of sight.

Although the portal is difficult, it does not have so many limitations, the limit distance is more than 10,000 miles, except for the long casting process, there are no outstanding weaknesses, as long as the magic is enough, this spell can bring a huge strategic advantage.

Having made up your mind, there is another level that must be solved.

Lin An's current level of mana is probably in the middle of the archmage, and the fifth-level spell is acceptable, but if the sixth-level spell is cast, a [portal] will probably extract a quarter of her mana.

And this kind of rapid extraction of magic power is the most likely to lead to an imbalance of magic power, which is often referred to as spell casting.

The archmage-level spellcasting counterattack is far from being comparable to that of a formal mage, and in general, in addition to practicing new spells, archmages will try their best to avoid casting spells that consume too much magic power.

Lin An naturally has this problem, but she has already found a solution.

That is to refine an extracorporeal demon source.

This external magic source is connected to Lin An's magic source, and the excess accumulated magic power accumulated in ordinary meditation can be injected into it for storage.

An external magic source can store no more than two-thirds of the mana of the main demon source, and when a large amount of mana in the main demon source is extracted, the mana stored in the external demon source can be injected into it in time to help the unbalanced magic power recover quickly.

The advantage of the external demon source is obvious, if you refine a dozen or so, you will be invincible below the legend.

But it failed to become popular, and in addition to the scarcity of materials, it naturally had obvious disadvantages:

It is connected to the main demon source, and all losses are lost, which is equivalent to giving the mage an additional exposed weakness, once destroyed, the serious injuries are light, and most mages will die on the spot.

Therefore, although the external magic source is good, even the mages who have mastered its method of making it will only control one external magic source, and will cover them with various protective spells to ensure that the enemy will never attack it.

Lin An doesn't need to think about the safety of the demon source, she has a mark space, and as soon as she puts the demon source outside her body inside, she will be safe.

Soul space can only be opened up by legends, but legendary powerhouses do not need soul space, they usually open up their own half-plane, and draw magic power from their own half-plane, and the effect is far more than a hundred times that of the demon source outside the body.

To open up soul space for others, the price is almost the same as the creation of the zào half-plane, and only Lulu and they will pay such a big price for Lin An.

In fact, the soul space is equivalent to the rudiments of the half-plane, and its spatial laws are controlled by herself, even a legendary powerhouse whose level is far beyond Lin An cannot peek into what is in her soul space.

When Lin An advanced to the Legend, if she wanted to expand this soul space into her own half-plane, the price she would have to pay would be much smaller than that of other Legends.

And because he started cultivating a long time ago, the half-plane and the soul are more compatible, and when it is connected to the main plane, the restriction is not so great, and through the feedback of the half-plane, Lin An can more easily deepen the comprehension of the law, so as to improve faster.

From this point of view, the value of the imprint space is thousands of times greater than that of the external demon source.

It's just that Lin An didn't understand its value at all before, and only used it as an ordinary space, and it wasn't until she returned to the Tower of Babel that she realized what a precious parting gift Lulu had given her.

It's a pity that Lin An is still far away from the level where he can truly use the soul space, and he can only focus on the present and accumulate step by step, so that he can change qualitatively one day.

In the archmage stage, the external demon source was an indispensable part of Lin An's improvement of his strength.

The external demon source must be refined by the mage himself, and any outsider interfering will lead to a mixed nature, making the final product a waste product.

Fortunately, the refining of the external demon source was not difficult, and Lin An's current alchemy level was basically sufficient.

The difficulty of its refining lies in the extremely high requirements for materials.

There is no limit to the types of most basic materials used to make the extracorporeal demon source, except that the spirituality is as high as possible, and it must be a super-magical material.

Hyper Magic Materials are easy to understand, and the most common example is the Magic Crystal.

Mana crystals are made from the condensation of mana, which naturally has no resistance to the flow of mana, so it has become an important auxiliary material used in many enchantment recipes to increase the magic conductivity of weapons.

The requirements for spirituality are also well understood.

Although the external demon source is a foreign object, it is actually connected to the demon source, similar to the addition of an external organ, the higher the spirituality of the material, the lower the rejection reaction of the material, the higher the success rate of the grafting of the external demon source, and the stronger the synchronization rate with the main demon source.

For this reason, most of the external magic sources were made of magic crystals, and originally in the imprint space, the guards also left Lin An with two giant magic crystals, each with a diameter of one foot.

But compared to the giant crystals that Lin An obtained in the underground space, these two magic crystals were only a small thing.

Lin An's "giant" level magic crystals, the smallest one has a diameter of one foot and a half, and the largest one requires an adult male to hug it with both arms, and the difference between the two can be seen just by looking at the appearance.

Lin An thought about it for a long time, but he was still reluctant to use the largest one, and chose a "Big Mac" that ranked in the top ten in size and the top three in spiritual testing.

The size of the external demon source must not be too large, otherwise it will be the target of the enemy.

Lin An had to condense the multi-ton "Big Mac" to at least the size of a fist, and not let its original spirituality be damaged in any way, so that it could be considered a half-finished product.

This stage takes about twelve mana, and can be completed in stages, exactly within five days of the return journey.

After that, the refining is a water mill.

Lin An needs to wear the semi-finished magic source close to her body to keep the magic power circulating for a long time, so that the magic stored inside the semi-finished magic source is in harmony with her magic power, when it is completely fused, and when the grafting is successful.

At this stage, it takes about one to two months.

The time to make the external demon source is too long, and at the same time, it has to constantly consume energy and magic power, if Lin An can not multitask, he will basically not be able to do anything during this time.

The demon disaster does not know when it will come, before that, Lin An must reasonably allocate his time to other affairs and spell deduction, and it is impossible to fight the world with abundant magic power alone; When the demonic calamity comes, the situation will be tense, and it is impossible for Lin An to have a safe spare time to refine more demonic sources.

Therefore, in the predictable year or two, Lin An probably won't be able to make a second extracorporeal demon source.

It's a bit too wasteful.

Even if half of the mana crystals have been stored, the remaining stock is still enough to jaw any force.

finally found an effective channel for the use of magic crystals, and Lin An naturally did not hesitate to share it with his friends.

She taught Andre the method of making the extracorporeal demon source to Andre and them, explaining the advantages and disadvantages clearly, and it was up to them to decide whether to make the extracorporeal demon source or not.

In fact, with Andre's level, it is a waste to make an external demon source now, because once the capacity of the external demon source is determined, it cannot be changed.

But in a special period, the extracorporeal demon source is a method that can directly improve the strength in a short period of time, and Lin An is wealthy, compared to Andre and their lives, what is one or two magic crystals.

The result on Sarin's side was not what Lin An expected. R1152