Now, one might be wondering how the others were able to use the communication badges. After all, they were bound by Divine Sense and blood. If one didn't do that, they didn't work...or so the System Sect badges were made.
However, for this plan of deception, Rean and Havek created a few badges that didn't need such a thing. First of all, the feature where it was bound was something they added after to keep the System Sect's communication system a secret.
However, it was far from being a secret anymore, so why should they care about hiding it? Better yet, why not use the fact that it couldn't be hidden anymore to their advantage? There was definitely no lack of participants in other regions that would love to get their hands on it and use the communication system to conquer the rest of the continent. All they needed... was to know it existed.