Moth Girl versus The Bats

Out of the moonlight they sped in their thousands, swift as death, razor wings glittering in the pale glow of the Wolf Moon. In the frost-shrouded city below, the final toll of the curfew bell faded. Latecomers hurried inside, the hems of their capes whisked through narrowing gaps as doors were slammed, shutters bolted and chimneys blocked. Those without homes huddled in hidden crevices, or burrowed under piles of rubbish as the bats hurtled out of the night sky. A high keening filled the air - whether emitted by the mechanical creatures themselves, or created by their sharp wings slicing the air no one knew - and suddenly the streets were filled with vicious whirling things, shredding anything soft that they happened across: clothing, flags, living flesh. Where do the deadly mechanical bats come from, and what is their purpose? Can songstress Thea use them against their creator to prevent the people of her town being slaughtered?