The surveillance on Zhao Ci definitely has other arrangements by the Ancestral Hall, and He Kao's mission belongs to a separate covert line, mainly to prevent accidents and to safeguard at crucial moments.
He Kao has two advantages, one is the Invisibility Ability, and the other is the Shadow Reflection Realm.
Zhao Ci has been sealed, and now only two people and two things can lift his seal. The two people, of course, are Jiang Daozhen who applied the seal himself, and Zhao Sanjin the patriarch. As for the things, they are the Bone-Penetrating Treasure Mirror and the Shadow Mirror.
With the Shadow Mirror in hand, He Kao can also lift Zhao Ci's seal, which is equivalent to the miraculous use of the Bone-Penetrating Treasure Mirror. More importantly, he can observe through the Shadow Mirror whether Zhao Ci's seal has been secretly lifted.
This is both supervision and protection for Zhao Ci.
