The Lethagoes were a mysterious hybrid species and a mix between Humans and Kalai. Lethagoes were Human in form but quite tall and thin. Nevertheless, they possessed a titanic strength that belied their thin frames. Their faces were thin and pale with a sharp nose, severe eyes and a jutting chin. Their appearance struck some as being quite birdlike, causing a theory to arise that the Kalai were an avian species. The Lethagoes were primarily encountered at Zirtran's Anchor where they served as representatives of the mysterious Kalai.