 Another addition to the fighting force debuting in Halo 2 were Drones , or <unk> 'e ( from the planet <unk> ) ; the animators found the creatures challenging , as they had to be animated to walk , run , crawl , or fly on multiple surfaces . Old concept art from Combat Evolved was re @-@ purposed in influencing the Drone 's final shape , which took cues from cockroaches , grasshoppers , and wasps . 
