Bushido: Nightwing Swarm

Description from the publisher:

A thousand pair of red eyes glowing in the darkness, a thousand fangs thirsting for blood. The Wave and the Council of Shadow’s Shugenja have many tricks ready to play in the game of war. Now they have unleashed nightwings from their cage of rock and blackness. Like leather winged locusts they tear through the countryside, gorging on those unfortunate enough to be caught in their path, leaving only the withered husks, sucked dry as a reminder of their unquenchable thirst.