Frequency Zero

Frequency Zero was a frequency that was audible to the purrgil, a species of space-faring creatures capable of hyperspace travel. By the Imperial Era, this frequency was no longer in use. During the Liberation of Lothal in 1 BBY, Ezra Bridger tasked Mart Mattin, Wolffe, and Gregor with transmitting a signal on Frequency Zero. This drew a large pod of purrgil which wiped out Grand Admiral Thrawn's Seventh Fleet and carried Ezra, Thrawn, and the Imperial Star Destroyer Chimaera into the depths of space.