Speak with Shadow Priest Allister at the Sepulcher.
Of course! How could I have forgotten?
Ambermill was one of the sites earmarked by the Kirin Tor, noted because it houses a dormant ley energy node. The wizards must be planning to reactivate the node and use its energies for some greater purpose.
We cannot allow this to happen...
It will take a great amount of power to activate the area's ley energies, we can stall them by taking the pendants away from the wizards.
Relay this information to Allister, he will decide a course of action.