Crawlers are small, insectoid creatures with a segmented body structure, featuring a hard exoskeleton that appears glossy and slightly reflective under light. Their bodies are primarily dark brown or black, with subtle iridescent highlights that shift in color depending on the angle of view. They possess multiple thin, jointed legs that allow for swift movement, and their heads are dominated by large, compound eyes that glow faintly in low light. The exoskeleton has a rough, slightly bumpy texture, with fine grooves and scratches indicative of their subterranean lifestyle.