"Switch out the displays."
If the attack on the border of Lanthanor was the first plan the Sect Master put into effect, this was his second.
After the Knight had told him about his suspicion that somebody was watching the borders of the Valley, the Sect Master had ordered a thorough search using trinkets that were specifically designed to detect other trinkets.
The trick was to use these without being identified by whatever was watching them. Thus, the search had been carried out with utmost care by sweeping in from 10 km outside the valley.
If trinkets were indeed keeping an eye on their movements, all of them would definitely be facing towards the valley. Thus it had been possible to identify the communication eyes without the Lanthanor Kingdom becoming aware of this fact.
The Sect Master knew that this was a trump card that he had to keep in his pocket.
Now, he inwardly patted himself on his back for the decision he had made.