Sonic projection

Sonic projection is an ability that can serve as either a function of a mechanical device or a super-power. Whatever its point of origin, the function of this phenomena is to generate and project waves of sonic force that can cause physical destruction or injury. Or it can be something as mundane as a dog whistle or a rape whistle.

An eager young inventor name Tetsuo Teri once created a glorified personal defense device that could emit an ear-splitting high-pitched whine. Of course, as it turns out, it ended up being most effective in causing people massive headaches. Fortunately, those most affected by this were a group of would-be alien conquerors known as Xians.