Sonora Boomer

A Cicada monster. It fought Wing Knight in a flashback alongside a Zenobiter and a Wiskraken. Another one was summoned by Xaviax to battle Adam as part of a way to convince the other Kamen Riders that the virus has been uploaded into the transmitter. Adam kicked it into a mirror as Chance uses his Shoot Vent on it. Len then uses his Final Vent to destroy Sonorabuma. Another Sonorabuma attacked Maya and Trent, but the two managed to stand their ground until Price showed up. It alongside Wiskraken were destroyed when Chance used his Shoot Vent on a flammable liquid barrel.