Sometimes, when the moon is full and bad omens abound, particularly foul smelling piles of garbage, vomit, and excrement will crawl out of the mildewing slime and take on a life of its own. These pestilent and confused globules of refuse are Grimers. They arise confused and repulsive, wandering seemingly at random, and everywhere they go they leave pungent droplets which in turn grow into a life of their own as a new generation of Grimers.