User blog comment:Lord Invictus Pane/Nargacuga Subspecies discussion./@comment-92.25.208.145-20101121131603

the green narga is actually a normal black narga, but the increase in mucus (snot) had caused inflammation in the pituatory glands, which causes a green slimy substance to be released from the sweat pores. The green slimy substance is what makes the narga green.