An array formation must have a core, known as an Array Eye. This means that if someone enters an array formation and wants to escape, there's only one way—to break the array formation. However, for those who wish to break the array formation, there are only two options: either seize the Array Eye or destroy it.
Generally, managing to destroy the Array Eye is already considered an honorable achievement for someone who enters the array formation. Seizing the Array Eye is nearly impossible, but exceptions exist.
Ye Xiao had read many ancient books detailing array formations, including information about the Array Eye.
