We found one secret base where the cult send and receive signal. Not only were there some device to receive signal from the battlefield, there's also another device to receive signal from somewhere else.
It might be as we expected. There are many secret bases where they send and receive signal from.
When were they made? Kayla checked the surrounding area first before I returned her to Tatrama with the devices to receive the signal. If we're lucky, then the device will be somehow connected when the cult is relaying information.
The devices were poorly made. They can only connect two devices together. The sender and the receiver. So they must make a lot of them. This means that it's impossible for them to have them ready all over the continent. Unless they have a lot of resources to make them.