Blight Drone
Blight Drones are daemon engines of Chaos sworn to the service of Nurgle, the Chaos God of plagues. Seemingly a bizarre and unsettling cross between larva, flies, machines and daemons, these sentient weapons of war are attracted in swarms to battlefields heavy with the dead (just like flies).
Armed with autocannons and maw-like openings that spew acidic poisons capable of melting through flesh and metal, in their high numbers they can be overwhelming. They have been used in many recent chaotic actions and the Death Guard and the Purge seem to favor these machines, using them to confuse and cower the enemy.