The only Zcham observed were tall and slim with bronze skin covered in silvery filigrees of integrated nanotechnology that resembled ornate circuit diagrams. Their eyes were lit internally and had a soft red-orange glow. They had two sexes: male and female.
Their nanotechnology allowed many useful abilities, including immunity to Selakar telepathy, and the ability to speak through another Zcham. This was undertaken by using a proxy routine to operate the main body while simultaneously conversing through another. (DTI novel: Watching the Clock)