Hundreds of gray monsters were swarming out from the excavated structure’s entrance at the center of the crater. They looked like cyclopean nightmares, enormous bipeds with muscles bunched and corded—something from ancient mythology that had suddenly become very real. Their elephant-thick legs thudded as they moved, giants above the humans, destroying everything within arm’s range, but they operated in an eerie synchrony. Like bees escaping a hive, clusters of them flew toward threats and crashed into them. Militia Warthogs roared around the crater, trying to engage the sudden menace, their machine guns kicking as they fired away.
	“They’re too big!” Ellis said, her voice drowned out by the sound of the firefight that had erupted. She’d never seen these creatures before. One of them plowed into a Warthog, punching the vehicle with its clawed wrists and flipping it end over end.

Halo: Envoy Ch 18