After learning about the discovery of Heilan Island by strange forces, Allen attached great importance to it and successively transferred the Heilan Army and the flying cavalry to Heilan Island.

Of course, in addition to these preparations, the most reassuring thing that allowed Alan not to worry about the safety of Heilan Island was because of the extraordinary strength of the guard.

At this time, there are two transcendent beings stationed on Helan Island, Bahamut and the mermaid Hastyna, with these two existences, the possibility of Heilan Island being occupied by others is very small, except for the strong people who meet the control level.

If there is a mastery powerhouse who covets Heilan Island, Alan is useless even if he arranges it with precision.

......

In the dark room, Alan stared intently at the clean wooden table in front of him.

At this time, there were five crystal discs on the wooden table, a crystal vessel the size of a grinding disc and a pair of small vessels, and a wooden shelf, on which were placed some clean crystal potion bottles.

The five crystal plates were filled with different, but precious-looking items, the highest yard was a pile of water element crystals, and the next plate was placed five palm-sized water-attribute transcendent demonic beast cores.

The other three plates contained a small pile of leaves of black wheeled grass, a bloody and fishy kraken parotid gland, and a number of ten-year-old black pearls.

Among them, the water-attribute transcendent magic core is the most precious.

These are actually the materials of the deep-diving potion, Alan is trying to make the deep-diving potion at this time, and I still remember that Allen spent more than 3,000 elemental crystals in order to get the formula of this deep-diving potion, and it is its ability to make people move freely underwater for a certain period of time.

It's a pity that the black wheel grass in the formula has always been a problem that can't be bypassed, and if you can't find the magic plant black wheel grass, this deep diving potion can't start making it at all, but not long ago, thanks to Bahamut when cleaning up the water storm crocodile in the black rat lake, he accidentally found a black wheel grass, which surprised Allen.

The largest vessel already contained a large amount of blood-colored liquid, which was the blood of a variety of water-attribute demonic beasts that needed to be added in advance, and these bloods were blended in a special proportion, which was the first step in the production of the deep-diving potion.

Then Alan picked up the kraken parotid gland and put it into it, and suddenly a large number of bubbles began to bubble on the surface of the liquid, and the rich water element in the liquid began to riot, and a harsh sound came from the vessel, giving Eren the feeling of being like a kraken's roar.

After waiting for a while, the phenomenon in the vessel gradually disappeared, and the surface of the liquid returned to calm, but a striking blue line appeared on the thick blood-colored liquid, and Allen's expression remained unchanged and he threw ten pieces of water elemental crystals and a black pearl into the liquid.

This time, the change was not so drastic, and when the ten elemental crystals slowly sank into the liquid, they began to decompose, and a large amount of water elements were mixed into the liquid, and the blue line flow on the liquid was constantly expanding and lengthening.

The black pearl turned into a stream of black air, shuttling back and forth in the vessel, and began to gradually merge into the liquid, until the last black stream merged, and Alan grabbed three black wheel grass blades from the plate on the table.

The leaves of the black wheel grass are very distinctive, round palm-sized, and there are many semicircular blue veins on the leaves.

Alan threw the three leaves into the vessel one by one, and the most peculiar sight appeared, as the three leaves melted, a large number of blue lines burst out of the blue veins on those leaves, and they rampaged through the liquid.

It wasn't until Alan added a Warcraft core that they were like ten thousand snakes returning to their nests, all of them were pierced into the palm-sized, blue-like core of the Warcraft core, causing the Warcraft core that was originally immovable in the face of liquid erosion to melt quickly.

The melting of the Demon Beast Core brought a great impact to the crystal vessel, and a large amount of water element was suddenly released, causing the vessel to begin to vibrate uncontrollably, and the blood-colored liquid inside was also constantly vibrating, turning into a dark blue transparent liquid.

There seemed to be a strange shadow swimming in the transparent liquid, and after a few piercing screams, it suddenly disintegrated and disappeared without a trace, so that the deep diving potion was completed!

I didn't expect it to be successful the first time!

Looking at the deep blue liquid in the vessel, Alan had a satisfied smile on his face, and immediately picked up the crystal potion bottle on the wooden shelf, and began to load the potion in the vessel into the special potion bottle.

After being busy for half an hour, Alan loaded the more than eighty bottles of deep-diving potions on the table into the Void Bead, cheered up and began to make deep-diving potions again, until the remaining four demonic beast cores on the plate were consumed.

There are a total of five transcendent demonic beast cores, which means that Eren has done it a total of five times, but unfortunately one of them had an accident and failed to make it, and the last one succeeded a total of four times, bringing more than 300 bottles of deep diving potions to Allen.

After putting more than 300 bottles of potions into the Void Bead, Alan quickly left the secret room, grabbed the two Bad Barton who had not reacted outside the door, and flew towards the sea area of the Red Dragon Principality.

Eren was very fast, and it didn't take long for him to reach the seashore and land on a large black reef.

A moment later.

"Lord Duke, this is a deep-diving potion, and there won't be any side effects, right?" Barton said with a suspicious expression as he looked at the deep-diving potion in his hand.

"Yes, my lord, what if I turn into a monster?" said Bard, who was also holding a deep-diving potion in his hand at this time, worriedly.

"What are you two afraid of, even if you become a monster, it will only be an hour, and you will recover after the time passes!" Alan said angrily.

After the production of the deep-diving potion was completed, Alan naturally wanted to experiment with the efficacy of the medicine, and the two high-level knights of the water attribute Battenbad were definitely a good choice.

As for the worries of the two, Alan had already thought of it, and deliberately used the Origin Bead to identify it, and after confirming that the deep-diving potion he refined had no side effects, he directly asked Bard Barton and them to test the medicine.

Bad Barton and the two glanced at each other, looked at each other, and asked them to draw their swords and kill people or something, their eyes were not blinking, but now this potion is different, listening to the meaning of the Duke, it may become a monster, and it makes people tremble all over their bodies when they think about it.

"Big brother, it's better for you to come! Now that we are about to break through the elemental knight, I am afraid that swallowing this potion may have an impact on my advanced elemental knight! Anyway, your cultivation is slow, and it is still early to break through the elemental knight, so you are not in a hurry, so it won't have much impact if you think about it!" Bard rolled his eyes and said with a bitter face.

When Barton heard this, he secretly scolded Bard for being cunning, not only finding this kind of excuse to shirk, showing off his cultivation talent, but also despised his slow cultivation, and said unhappily: "Since this potion was given to us by the Duke, I don't think there will be any side effects, don't you even believe the Duke?"