It was too late for those who would stop the digi-emperor. Rebels tried, but the tyrant had already used the dark gears to control many digimon, using them to build radio towers. When the signal went off it didn't matter where the rebels were. They would all knell.

Day one prompt for Hypnovember. This one inspired by the many control spires in season 2 of digimon. The idea of a radio tower somewhere beaming commands instantly into the unsuspecting populous is pretty A+ in my book.