Wallac: "Cardinal Delvine, how good of you to volunteer to go first." Two IHH templars make it very clear that either she step forward, or they drag her out. In the event she walks, a bit weak in the knees perhaps. "The original technique for spotting them required quite some insight, quite some insight indeed. But yes, you may all appoint members of your clergy to learn it as best they can. The genial part, however, is that, like so many things of the Shadow, they cannot stand the righteous power of the gods. Channel onto then the divine power, to drive them out, like you would a demon or the unliving. Unfortunately they are hardened against it to a certain degree - you will find that only the strongest and purest of priests can reveal their true nature and burn them. Yet it is enough - you will spot them and you will confirm their nature."
Delvine turns out to be normal enough.
"Just be careful when you are about it. They are much stronger and more dangerous then they appear."
"Next!"