In normal circumstances, such a formation is enough to monitor movements within a hundred miles.
In fact, if the distance is relatively close, even the appearance of demonic beasts near the formation can be seen.
Therefore, with this monitoring function, the Blood Red Alliance has set up more than a dozen of these formations over the years.
Every time the Secret Realm opens, the Array Masters of the Blood Red Alliance will maintain these formations to ensure that they continue to operate after the Secret Realm closes.
For this opening of the Secret Realm, the Blood Red Alliance, as usual, sent at least one Third-Order Array Master into the Secret Realm to maintain those formation barriers.
When it comes to the purpose of this formation, it's quite important to those top Yaun Ying forces.
After all, a properly functioning formation is equivalent to an eye for a force, monitoring the basic changes in the Secret Realm at all times.
