The method of arranging the formation is difficult, and the form is secondary.

Mobilizing the aura in the mountains, rivers and seas is always the most troublesome thing for the formation master, the aura of different mountains and rivers is very different, and there are mulberry fields in the sea, and there are changes in the years, in the passage of time, the underground aura dragon will often change, or deviate, or split and reorganize, and may even dry up completely, which will bring earth-shaking changes to the formation.

An earth-shattering array that was originally at the level of the emperor array may be reduced to a waste array where the Divine Mind Cultivators come and go at will, and a spirit gathering array that only gathers spiritual energy, or it may become a terrifying fierce array that can threaten the Half Emperor.

Therefore, when the formation master arranges this kind of large array that needs to span a long time, he will often use various means to restrain the aura dragon under it and make it fixed.

On the boundary road, there are no mountains, rivers and seas except for secret places, and naturally there is no matching aura dragon, but in order to maintain the strength of the formation, the formation masters still explored several means of artificial aura dragons, the most common one is to use the city as the foundation, using magic weapons or genius earth treasures to condense an aura dragon to make a momentum for the formation.

Ember City has used this method.

The emberfire city has been damaged several times, in the last reconstruction, the pavilion of all saints buried several magic weapons in the ground of the emberking city, turned into a tail of the aura dragon, based on this, the pavilion of all saints arranged a large array of embers, but unfortunately, there are not many top array masters in the pavilion of all saints, this ember array is not arranged for the purpose of defending the city, its original intention is only to preserve the embers that continue to die and weaken, and the ancient altar in the city is the eye of the ember array.

However, at this time, this aura dragon played a different role.

After retreating to the East City, the disciples of the four major sects quickly set up a line of defense, which started from the middle line of the main street and stretched to the end of the East City, the main street was lined up, and two hundred ballistas were erected, these ballistas were carefully crafted by the All Saints Pavilion, called the Divine Blood Crossbow, which was the treasure at the bottom of the pressure box of the All Saints Pavilion, the crossbow arrows were completely made of glazed blood copper, and the black beasts of the God Realm were more fragile than paper in front of this crossbow arrows, even the black beasts of the Tianyuan Realm were injured immediately, which was more powerful than the nine arrows that were used before, but each ballista could only fire one crossbow at a time, so in order to make up for the lack of quantity, in the middle of the two hundred ballistas, also interspersed with nine arrows to shoot crossbows, equipped with crossbow arrows are engraved with the spirit pattern of the fire path, the lethality is strong enough, and the area covered is also very wide.

And before the ballista, a three-foot-high white jade pillar was inserted into the ground, and they supported an aura barrier, this kind of white jade pillar is a unique magic weapon of the boundary road, called the group array jade, in essence, they are simplified and easy to carry formations, which are imprinted with complex spiritual patterns, as long as a group of white jade pillars are laid out within a certain range, even the monks of the Divine Mind Realm can support a powerful defensive formation.

And the array jade used by the All Saints Pavilion is naturally of the best quality, this set has a total of nine hundred and ninety-nine white jade pillars, from the main street to all parts of the eastern city, according to the deduction of the formation master, inserted one by one white jade pillars, and the formation master who controls this formation is as many as five people, they are scattered all over the city, holding white jade plates, and this formation is urged together.

But the All Saints Pavilion is still not at ease, the black beast is menacing, and it is difficult to say how long this set of array jade covering half of the city can last, so they sacrificed a three-legged giant tripod, this bronze tripod is three zhang high, hanging on the top of the east city, it is closely related to the aura dragon under the ember fire city, and it can call the huge aura.

The disciples of the other three sects each took on a part of the defense line, in order to defend this embered city, the four major sects all spent a lot of money, boxes of rune paper and magic weapons were moved up, for the disciples to use, the Holy Pavilion even distributed a lot to the scattered cultivators, these scattered cultivators stayed in a swarm between the buildings in the eastern city, after retreating to the eastern city, they temporarily lost their usefulness.

The changes in the sky dome are visible to the naked eye.

Hug a realm overhaul is still fighting on the dome, through that crack you can glimpse a lot of brilliant scenes when the Dao Technique flies by, the Chu family brothers and the nineteen also galloped all the way up, almost hitting the ember city, in the corner that no one paid attention to, those octopus-like black beasts have been constantly eroding the holy stone on the dome, although the speed is not fast, it is difficult to see with the naked eye, but when everyone retreated to the east city and came back to their senses, they found that the crack had more than doubled than before.

The light is getting dimmer.

In this battle with the aura, the darkness began to take over, eating away at the only remaining light, and every disciple silently wore the holy stone magic weapon, and no one could say when the darkness would completely envelop the city.

With the expansion of the crack in the dome and the expansion of the darkness, the number of black beasts pouring into the city skyrocketed, and after the defense line of the eastern city was constructed, the monks stationed at the north gate also retreated, which made the two armies of black beasts finally converge and surrounded this group of monks.

The light in the city is sparse, like the night when the stars are dim, the roars of the surrounding beasts come and go, with the influx of black beasts from the south, they also bring the fishy smell of the dark wind, gusts of wind pass through the north city gate, and hit a point of light on the aura barrier of the array jade, like summer fireflies, but the beauty is mixed with unspeakable danger.

After pouring into the city, the black beasts only hesitated for a moment, and then rushed up against the aura barrier fearlessly, the low-level black beasts grabbed and patted, and used their flesh bodies to fight against the scorching aura, and the high-level black beasts had more means, or weird secret techniques, or spit out a cloud of venom that I don't know what it was, but it was very dangerous at a glance, and the moment it landed on the aura barrier, the black mist rose in the sky, and the crackling sound was endless.

The disciples of the four major sects fought back instantly.

The nine arrows were already full of crossbows, and in an instant, hundreds of crossbow arrows flew out, and the fire path spirit arrows drew red traces in the night sky, and a fire dragon was set off on the main street after a while, and tens of thousands of black beasts were suddenly empty, after the raging fire burned out, there were no living creatures on the entire main street, only some of the charred stumps were emitting black smoke.

This majesty frightened even the monk himself.

Needless to say, few of them have seen this kind of crossbow cart open bow, and although most of the disciples of the four major sects have used it themselves, no one has ever seen the huge momentum of hundreds of nine-arrow crossbows firing at the same time, and they have far underestimated the power of this kind of crossbow arrows.

But the Black Beast never fears death.

After a brief silence, a large number of black beasts continued to rush forward firmly, and among them, high-level black beasts such as Kongtong Beasts appeared again.