He Kao introduced this artifact known as the Shadow Mirror, which is a replica of the Observing Body Sect's sacred artifact, the Bone-Penetrating Treasure Mirror. It was lost a thousand years ago alongside the Bone-Penetrating Treasure Mirror and later emerged in the Xiao Alliance.
A disciple of the Xiao Alliance carried this mirror, infiltrated the Eastern Country, and attempted to harm the Magic Sect disciple. However, He discovered this and killed them, thus acquiring this item... But the fact that he possesses the Shadow Mirror must still be kept strictly confidential for now.
Using the Shadow Mirror for spellcasting has effects somewhat akin to Xue Guanghan. He Kao even suspects that the ancestor of the Magic Sect might have borrowed the wondrous effects of treasures like Xue Guanghan to create such a divine artifact as the Bone-Penetrating Treasure Mirror.
