Sure enough, Folesve wasn't the Sect Master of one of the big powers at the center of the Realm of Gods for nothing.
Roan was a master in strategy. With that said, he prepared everything he could to prevent information from leaving his country for as long as possible. That's why he had Luina check all the places he asked for and put their images in jade slips. After the girl went around doing his task, Roan placed thousands of checkpoints around the country. All the routes that could be used to leave Butiva were now closed completely.
Worse than that, most of these checkpoints had cultivators, demon beasts, and spirits holding Rean's copied badges. That meant their Divine Senses were all working perfectly fine. With their cultivations not suffering from the suppression, it made it extremely hard for anyone to sneak past the checkpoints.