The Ice Blaster actually originated from a very simple device, which is a grenade. The history of the development of weapons has changed from the earliest simple use of the human body's own energy to push objects to cause damage, that is, bows and arrows, to the later use of chemical energy to push objects to cause damage, that is, solid artillery shells, to the later use of large energy to create a large number of fragments to cause wide-area damage, that is, missiles and grenades, to the last simple high-energy damage, that is, atomic bombs.

In fact, in Allen's view, magic is actually the same thing, magic is energy, and urging entities with energy is icicle technique, and if you want to imitate the killing method of a grenade, it is actually mainly to form a large burst of energy inside the structure, and then instantly collapse the structure and cause damage with a large number of fragments.

This idea was actually already there when Alan tried to make a firearm, but the most important connotation of the grenade is not only the internal energy burst, but also the strength of the peripheral structure, if the structure is not strong enough, then it is easy to cause energy leakage, and then the power will naturally be greatly reduced, let alone collapse and then shoot fragments. This problem was solved when Eren learned to construct magic nodes, the circle is a fairly stable shape, and almost as long as Eren has enough mental power, he can build an infinite number of nodes on the circle, as strong as he wants.

As for the energy that caused the eruption in it, Alan also had an idea for a long time, and this idea was also realized after Allen understood the fundamental principle of temperature conversion, that is, sublimation!

Sublimation is a reaction in which the solid state changes through temperature, crosses the liquid state, and directly becomes a gaseous state, the most common is the phenomenon of dry ice directly sublimating into carbon dioxide, in Allen's idea, as long as the peripheral structure of the ice ball is stable, trigger the magic left in the center of the ice ball or ice pick, and then when the ice in the middle of the ice cube becomes gas, the volume will expand greatly in an instant, and then the huge pressure can naturally squeeze the ice ball, and spew out the energy in one breath, turning the ice cube into a cannonball.

Of course, if you want to carry out the sublimation phenomenon in the strict sense, Alan still can't do it, after all, Alan is a programmer, not a chemistry student, Alan only remembers that if you want to sublimate an object, you have to take into account various problems such as air pressure and temperature, but in Allen's opinion, the ice cube turns into a liquid in fact, the volume is reduced, so even if it becomes a liquid, it can also cause a large volume change after evaporating into gas in one breath, and it is a successful magic for Allen to cause damage.

As a result of the experiment, the effect of the ice pick is not very good, after all, the structure of the ice pick is to hurt people with the tip, and it is not particularly stable, and the ice pucks have finally found the most suitable and lethal magic structure under Allen's experiment, and therefore, Allen named it Ice Blast, of course, it is not suitable to make such a large ice ball bomb in Anivia's home, so Allen is only doing small-scale experiments, and it is an accident that it can have such a great power after amplification.

However, being able to inflict damage close to that of a legendary mage with the magic power of a mid-level mage is certainly not without a price, and one of the costs is that this magic is actually very easy to crack......

The premise of this magic is to have a stable structure and a large enough puck, if it is damaged by the opponent, there are cracks or the structure is unstable, then the pressure will explode early, and the damage will naturally be greatly reduced. Moreover, the enemy is not a fool, after knowing that he has the big killer of the ice explosion technique, when he tries to throw the big ice ball, the other party will either hurry up and break the big ice ball, or flash far away, and will definitely not stand there and blow him up like the elven magician today. Of course, Alan still has some ideas, and even if it's just a large ice hockey ball with a stable structure, it can deal damage with mass, so there are actually many ways to apply this magic, at least on the premise of being able to pose a threat to the opponent, there will be a lot more options for combat.

"So, what are you here for?" Benjamin saw Allen's indifferent look, and couldn't help but glance at Allen, creating such a powerful magic can not be arrogant or discouraged, it is indeed a good seedling of a magician, but Benjamin's status is too high after all, and in his position, there are many things to deal with, it is unlikely that he will accept him at will because he likes a child, which is irresponsible to others and to himself, and to accept Aier's daughter, in addition to the face of old friends, is actually to stabilize the friendship between humans and elves, otherwise Benjamin really has nothing to teach an elf who only understands wood magic。

"Well, the elven diamond you promised me ......," Alan said resignedly, looking like a begging puppy.

"You almost demolished the gate of the Elven King's palace just for that thing?" Benjamin's eyes widened, he thought there was something important to tell him, maybe it had something to do with the death knight that Eren killed, so he came in such a hurry, only to ask for a reward?

"I can't help it, you're always gone, and I can't usually contact the Elf King. Alan poked his index fingers with both hands, aggrieved like a little daughter-in-law.

"Then our identity will not depend on your account, the air here is fresh, the scenery is beautiful, and you still play with the daughter of the King of El all day long, so I won't be wronged by you if I wait a little longer, right?" Benjamin choked slightly, after all, he was the one who brought them into the forest in the first place, but after bringing them in, he ignored them, which also seems to be unreasonable. Of course, Benjamin has his own affairs to deal with, if he doesn't take advantage of Arthur's incident to pull the elves into the war, then this group of self-esteemed long ears is more likely to completely shrink the battle line into the Twilight Forest than to send soldiers to the front line, in order to avoid long nights, Benjamin almost day and night uses the teleportation array to go back and forth to the territory of orcs, dwarves, elves, and even dragons. With this matter, which can almost be said to be related to the survival of the race, Allen's matter can be said to be a trivial matter.

Anivia blushed when she heard Benjamin talk about herself, and looked to the other side as if nothing had happened.

"But the time for the academy assessment is ......" Alan nodded and immediately shut his mouth, Alan knew at a glance that Benjamin must have forgotten everything, in order to avoid the old man being annoyed and angry, it is better to stop this kind of thing.

"Hmph, of course I do...... Isn't it just a fairy diamond, see you're nervous like this, come with me. Benjamin's face turned red again, if it wasn't for Allen's reminder, he really completely forgot about the academy.

"......" Alan rolled his eyes in his heart, why didn't he say that he was just a fairy drill when he tricked himself into the tree hole in the first place.

I saw Benjamin disappear in front of Alan with one step, and then, not long after, Benjamin walked back and threw Alan a small box.

"Is this the Elf Diamond?" Alan couldn't wait to open the box, joking, this is something that he worked hard to get, and if nothing else, it will be a step into his own advanced and solid step.

The box contained an unremarkable transparent gemstone, and Alan was a little disappointed to pick it up and look left and right, it looked no different from an ordinary diamond, and it had not been carved in any way, resulting in a somewhat rough look.

"Huh?" Alan suddenly seemed to notice something, and pointed the elf diamond at the place where the light shone in, only to see that the elf diamond actually absorbed all the sunlight shining in, resulting in a little dim under the sunlight, this abnormal performance made Alan a little more confident.

"The energy contained in this elf diamond can be used by two people to locate the cycle, but you must first have a rough imagination of the cycle you want to build, the clearer the imagination, the more accurate the circular anchor of the elf diamond, of course, the first person to anchor must take more risks, after all, there are many mistakes that will only be discovered in practice. Benjamin reminded, and at the same time made a gesture to ask me if he wanted to reduce the risk, but he still couldn't say that, he didn't want to make it seem like he cared about the bastard boy.

"yes, I have a question you want to ask, can you?" Alan happily put the elf diamond away, and then looked at Benjamin with a worried expression.

"Hmph, it depends on my mood. Benjamin's heart was so refreshing, he finally let this muddy boy bow his head, although I brought you to the forest and left it alone, but you knocked on the door like this is still too shameless, Benjamin said he was very unhappy.

"Well, the deadline is almost up, can you find a griffon beast to take us to Fort Fringe, or will you always have time to take us around the teleportation array?" asked Alan cautiously looking at Benjamin's face.

「......」

"Mr. Benjamin?"

「...... Get out!"

"What did you say?"

"Get out of here, you stinky boy!" Benjamin yelled.