Vashta Nerda

Also know as the shadows that melt the flesh. Vashta Nerda or small swarms, not big enough to be a harm to most life. In a large number, they can strip a creature to its bare bones in milliseconds. The shadows that melt lived in the darkness. they cast shadows when they enter the light a swarm of them looks like a shadow casted by nothing. They imaged the shadows of their food to get close which means staying in the light was only a way to escape. So if a prey already had and extra shadow it was too late.