In a quiet room on the fifth floor of the Tide Viewing Pavilion, a handsome middle-aged man is standing by the window, looking out of the railing. The door opened leisurely, and a figure came quickly, three feet in front of the middle-aged man, and knelt down on one knee: "The apprentice has seen the master!"

The middle-aged man turned around, stared at the person in front of him for a moment, grabbed the shoulders of the person kneeling on one knee with both hands and helped him up, looked left and right with excitement at the person in front of him, and couldn't help but say: "Good apprentice! Good apprentice! You have grown up, you have really grown into a man, and you are no longer the naughty child you were back then!"

These two people are naturally Jin Dongzi and Lu Yi. Back then, Lu Yi was just a child who had not yet reached adulthood, but now, he has grown into a beautiful man; back then, Lu Yi was only a fourth-order cultivator, but now he has stepped into the ranks of sixth-order monks, all these changes are not insignificant, how can Jin Dongzi not be surprised.

"Hehe, master, you are getting younger and younger, and you are more like a gentleman. Lu Yi said to Jin Dongzi with a hippie smile.

"Stinky boy, I haven't seen you for so many years, and I haven't seen anything else, but this kung fu is good practice!"

The atmosphere was still very relaxed, and the two soon sat opposite each other, telling each other about the past hundred years and their respective experiences.

Lu Yi started with his own experience in Tiankeng, and told him everything he could express to Jin Dongzi in his growth experience over the years, including Lu Fenglai, Chou'er, some exchanges between himself and the Feng clan, some encounters in the alliance headquarters, and so on. Jin Dongzi also told Lu Yi about the current situation and his feelings in the alliance for more than 100 years. Then, Jin Dongzi focused on introducing some information about the Feng clan to Lu Yi, from Jin Dongzi's mouth, Lu Yi could hear that he had a great prejudice against the Feng clan, especially when mentioning the current ancestor of the Feng clan, he scolded each other one by one. This couldn't help but make Lu Yi even more convinced that there must be a deep grudge between Jin Dongzi and the Feng clan.

When talking about the current trend of the demon race, Jin Dongzi said that now, the demon race has appeared more and more in some hidden corners of the Tianchao Continent, over the years, there have been demon strongholds found and destroyed by the two demon clans, although the level of these demons who appear on the continent is not high, at present, they are basically in the fourth and fifth orders, but their means are not weak, in addition to being good at the use of combined spells, some also carry heavy treasures, and often cause damage to the opponent unexpectedly in the confrontation with the two clans。 In addition, all the discovered demon strongholds have a common feature: they are all building large teleportation arrays over long distances, and the motive is obvious, this is to prepare for the follow-up troops of the demon clan to set foot on the continent on a large scale.

After the two finished talking about the old days, it turned out to be late at night.

This time, Jin Dongzi came to this area of the Southern Chaos Sea to guide the construction of the defensive circle of the ten fortresses along the coast. The alliance can be described as painstaking for the attack of the demons that may come from the sea, every certain distance, the alliance will have a special high-level monk responsible for site selection according to the terrain and surrounding resource conditions to select the most ideal geographical location as the address for building the fortress, mobilize a large number of middle-level monks to collect and carry a huge amount of resources to come, according to the guidance of a senior formation mage like Jin Dongzi, to establish and form one or several fortresses or fortress groups as a group, to form a defensive fortress. Each fortress or several fortresses can be independently formed or combined into a clever defensive array, and the strength of the defense has reached a level that can resist the continuous attack of ten early stage monks for about a month. Once the fortress is built, the alliance will send spiritual monks to station on duty according to the size of the fortress, and at the same time, the alliance is also stepping up time to train a large number of middle and low-level monks as the basic defense force of these fortresses, and the main training content of these monks is to cooperate in groups, such as forming various battle formations for attack and defense, and releasing large-scale combination spells through secret arts. The so-called training for cultivating leaders that Lu Yi participated in before was prepared for the use of these fortresses, and some of the personnel eliminated from the training assessment will be sent to the fortress as military commanders after a certain amount of special training, responsible for the management of other monks stationed in the fortress except for the monks of the Spiritual Period. The lucky few who can finally pass all the tests and training will be sent as the commander of the regional fortress after the cultivation has also grown, and will be responsible for directing the military operations of all the fortresses in the fortress area, including the dispatch of the Soulbuilding monks stationed in the fortress.

For a period of time afterward, Lu Yi always followed Jin Dongzi. The first stop of the two was an isolated island 30,000 miles away from Mingsha Island, this island is two hundred and forty-seven miles in circumference, it is an island with a strange terrain structure in the middle of the high mountains on all sides, Lu Yi's first feeling when he saw its whole picture was that this was a miniature version of a sinkhole. The monk in charge of site selection at the Alliance headquarters planned to build a huge square fortress in the central depression of the island to defend the sea with a radius of 5,000 miles.

When Lu Yi arrived with Jin Dongzi, there were already 5,000 fourth-order and fifth-order monks, 600 sixth-order monks, and thirty seventh-order monks here, led by a spiritualist monk, who had arrived in advance and broke ground to start building the fortress. I saw that there were monks flying around in the air, stopping in a certain place from time to time, and then taking out long or square shapes, or dozens or even hundreds of zhang long, or short and only a few feet long, and placing them in a certain order and in a predetermined pattern on a specific position from the storage container. After using up the materials in hand, they took out new materials from the storage container and continued the new steps, everyone was working in an orderly manner according to their own strength, and a large fortress covering an area of a hundred miles had begun to see the outline. Lu Yi carefully observed the materials used by the monks, and found that the lowest level of them was also the fifth order, and even the wall of the fortress, which constituted the outer wall of the fortress as the main means of defense, turned out to be a seventh-order stone, which showed the high hopes of the alliance for such a fortress.

Jin Dongzi stood beside Lu Yi and said to Lu Yi: "Apprentice, with your current formation attainments, can you see a little bit of the way?"

Lu Yi didn't answer, but observed intently for a long time before saying, "Master, this should not be just a simple defensive fortress, right? Because it is built on the chaotic sea, the foundation is the rock of the island, the five elements occupy two seats, and the rest of the materials are mostly gold, fire, wood attributes, so, first form a cycle of five elements to reduce consumption, and then use the four city walls to form a four-elephant array for defense, the towers on the four walls of the castle are the main attack, if you place powerful spirit stone cannons and other sharp weapons, it will be a great threat to the monks under the spirit building period. In this way, the fortress truly formed a solid fortress, which could be attacked and retreated, and used to block the enemy and contain the opponent. Besides, I see that a tall tower is being built in the middle of the fortress, and I wonder what it is really for?"

"Well, this is a new formation that the division has comprehended in an ancient formation, and the division will temporarily name it 'Four Six Harmony Array', you can see it well, at present, this fortress is a combination of the four elephants and the five elements array, in fact, the tower in the middle is the real heart of this array. The outermost layer of the four elephant main defense, the middle of the five elements of the main energy supplement, the innermost tower is to connect all the towers of the entire fortress, forming the most powerful attack and killing weapon, as long as the energy is enough, the tower of the spell is enough to kill the early stage of the spirit within a hundred miles. This is the real strength of this fortress, and it is also the most hidden killing move. Once the fortress is besieged and undefended, it is completely possible to show the enemy to weaken the defensive range, trick the opponent into approaching and launch a surprise attack on the tower, annihilating the opponent's main offensive force, in order to turn defeat into victory or delay for a longer time for reinforcements to arrive. ”

When Lu Yi asked how the monks defending the fortress would deal if the fortress could not hold it in the end, Jin Dongzi replied with a smile that a one-time teleportation circle would be set up in the innermost layer of the fortress, and the magic circle would be combined with another self-destructive magic circle arranged inside the fortress.

After Jin Dongzi's explanation, Lu Yi now understands that this fortress is ingenious and unusual in design, and it is very thoughtful.

The master and apprentice stayed here for nine years, and Lu Yi not only supervised the construction of the fortress with Jin Dongzi every day, but also personally tried to participate in the construction of the fortress and the layout of the magic circle, so that he could have a deeper understanding and understanding of Jin Dongzi's new magic circle. It wasn't until the fortress was completely completed and Jin Dongzi himself tried to run the fortress's magic circle and handed it over to the person in charge that it was done. And Lu Yi was also surprised to find that the person in charge was the eighth-order monk who led the team to build this fortress, and more than 5,000 monks who participated in the construction were all stayed, and he suddenly realized that these people have not only been building this fortress for many years, but also understood and familiar with every inch of the fortress in the process of construction, so that they can operate and use this fortress, it is more handy and familiar with the road, and the high-level of the alliance has considered it too carefully, which makes Lu Yi have to admire.

In this way, the master and apprentice traveled back and forth on the Southern Chaos Sea, and thirty years passed in a blink of an eye, and in these thirty years, Lu Yi participated in the construction of a total of four fortresses, and the magic circle designed by Jin Dongzi in each fortress was different, which also benefited Lu Yi a lot, and he made rapid progress in the formation attainment.

Until, one day, a new order passed from the Law Enforcement Hall to Lu Yi's hands.