A chameleon shroud was a device which could be used to disguise one's self.
Harper used a chameleon shroud to disguise the fact that she was an Unzal and pose as a human assistant to Cherilyn Dankworth. She removed the shroud only after Dankworth broke her conditioning. (AUDIO: The Unzal Incursion [+]Loading...["The Unzal Incursion (audio story)"])