N'Akkiarlian colonic worm

The N'Akkiarlian Colonic Worm is an intestinal worm which affected primarily the N'Akkiarla, N'Akkiarlian humans and Humanity. These worms lived in the intestines (primarily the colon) where they fed on blood, due to secreting a special anaesthetic they were practically impossible to feel and most cases were symptomless, however large infestations could be felt as an itchy and discomforting sensation in the rectum.