Just like the mountain-protecting formation, even if you are powerful, it is very laborious to set up an formation that stretches for thousands of miles.

Moreover, the materials and experience consumed in setting up the formation are too terrifying.

Especially when deploying high-level formations, the array materials required are also of a very high grade.

Even a powerful force with hundreds of thousands of foundations is not willing to bear this price.

Therefore, I thought if I could arrange an extremely clever formation, and then condense the mirror image of this formation.

With only one amount of materials and energy, dozens or even hundreds of formations can be used.

This formation method is also called the sub-matrix, and the actual array laid out with materials is called the mother array.

The reflected mirror formations are called sub-arrays.

The formation requires regular maintenance to function stably.

The biggest advantage of the mirror array is that it is relatively simple to maintain.

As long as the main formation is maintained, if the main formation is intact, the sub-arrays will also be intact."

After hearing this, Wang Daoyuan fell into deep thought.

The defensive formation on the north shore of Juetian Abyss seems to be arranged in this way.

He had previously left Juetian Abyss from the east of Tianzhan Mountain Range and found that the formations there were almost the same as those to the west of Juetian Abyss.

The formation to the west of Tianzhan Mountain Range is maintained by Shenbing Pavilion and Taiyi Sword Sect. It is not surprising that it has persisted for tens of thousands of years.

But no one maintains the formation east of the Tianzhan Mountain Range.

If it were more than 50,000 years ago, the Valley of Ten Thousand Beasts might still be under maintenance.

But the Valley of Ten Thousand Beasts has been extinct for tens of thousands of years, and the formation that has been left unmaintained for tens of thousands of years should have become incomplete.

The defensive formation was incomplete, and the demons should have entered Juetian Abyss long ago, but there was no large-scale invasion by the demons.

Moreover, Jue Tianyuan extends all the way from the Beiyuan Immortal Realm to the east of the Seven Star Sea Immortal Realm.

There is a vast ocean between them, so it is impossible for people to maintain the formation everywhere.

I always thought it was a bit strange, but limited by my knowledge, I couldn't figure out the reason.

Now it seems that the layout should be a mirror formation.

"Senior, how can this formation form a mirror image and still ensure its power?

According to my guess, the formation on Jue Tianyuan's side should be a mirror formation.

When the demons invaded, my master, Guiyuan Sword Immortal, cut off the Zulong Mountain with one sword in order to kill the demons.

The northwest corner of the Qianyuan Continent was separated, forming a new world of immortality.

This Juetian Abyss continues to extend east and west, and now it has reached the Immortal Realm of the Seven Stars Sea, hundreds of millions of miles away.

For such a large-scale formation, there are only a few hundred thousand miles of formation maintained by monks.

This part should be the mother array, and the rest are sub-arrays.

But it is incredible that the sub-formation can stretch for hundreds of millions of miles."

Lord Yin Yang replied: "It is not difficult to form a mirror formation. You only need to add the mirror law into the formation. What is difficult is to maintain the power of the sub-formation.

A mother array can derive dozens or even hundreds of sub-arrays, but the power of the sub-arrays will be far less than the mother array.

The farther away the sub-formation is from the mother formation, the less powerful it is.

It can be seen from this animal skin book that the method of connecting the formation is used to enhance the power of the sub-array.

Where there are sub-arrays, arrange a simple lead-in array to blend in with the sub-arrays.
Chapter completed!