Using the Locating Stone for detection does indeed have one frustrating flaw: whenever it detects an item bearing the Goddess's Blessing, that item begins to emit a dazzling, brilliant light to pinpoint its location.
This was originally meant as a warning—either you hand it over yourself, or you wait for us to arrive, and then things play out differently.
If the Filth happened to be carrying such an item, it would be no different from broadcasting a clear signal to the world that someone was hunting it down.
Chapter 21